Hi! We are Monterail - a team of : **130** experts working together to create meaningful software. We are looking for a **SeniorReact Developer** to join us as a freelancer and help us create different projects for our clients. We're looking for a Senior React Developer (7+ years) with some Java skills to join a product team building a multi-app system centered around an operator console - a real-time interface for controlling and managing robotic machinery. **RequirementsThe team:** 4 backend engineers. You'll be the frontend lead, owning the React layer with occasional Java touchpoints. **What we're looking for:**

*   7-8+ years of experience, React as your primary stack
*   State management: Redux, Zustand, or Context API
*   Java familiarity is a strong plus (fullstack capacity welcome)
*   Strong English communication

**Engagement:** Long-term

*   B2B
*   Full-time

What do we mean by freelance?

*   Read more at Monterail Tech Network

**SalaryB2B contract and hourly rates dependent on skills and experience.**

Senior React Developer with Java - Freelancer

**Stanowisko**

Obecnie dla naszego klienta z branży biofarmaceutycznej poszukujemy kandydata/kandydatki na stanowisko Senior Fullstack Programisty/Programistki.

**Dodatkowe informacje**

*   Projekt realizowany jest w międzynarodowym środowisku i koncentruje się na rozwoju zaawansowanych systemów wspierających przetwarzanie danych na dużą skalę.
*   Współpraca ma charakter zdalny i długoterminowy. Zakres obowiązków obejmuje pracę zarówno po stronie backendu, jak i frontendu, z wyraźnym naciskiem na backend oraz rozwiązania chmurowe.
*   Projekt realizowany jest w doświadczonym zespole pracującym w metodyce zwinnej nad rozwojem skalowalnych systemów produkcyjnych.

**Oferowane wynagrodzenie**

Wynagrodzenie: od 12 000 do 15 300 brutto/miesiąc, w zależności od posiadanego doświadczenia i kompetencji.

**Sprawdzisz się w tej roli, jeżeli:**

*   Posiadasz minimum 5 lat doświadczenia w tworzeniu oprogramowania w projektach komercyjnych (enterprise)
*   Bardzo dobrze znasz Java oraz frameworki takie jak Spring, Hibernate/JPA
*   Masz doświadczenie w pracy z architekturą mikroserwisową
*   Swobodnie programujesz w JavaScript i TypeScript (Angular 5+ lub React)
*   Posiadasz praktyczne doświadczenie w budowie REST API
*   Pracowałeś/aś z bazami danych SQL i NoSQL
*   Masz bardzo dobrą znajomość AWS (m.in. S3, IAM, EC2, ECS, ECR, Lambda, Serverless)
*   Korzystasz z Dockera i rozumiesz podejście DevOps
*   Znasz Git oraz standardowe workflow (MR/PR, protected branches, semantic versioning)
*   Potrafisz samodzielnie wdrażać aplikacje na środowiska produkcyjne
*   Dobrze odnajdujesz się w pracy zespołowej i komunikacji z klientem
*   Biegle posługujesz się językiem angielskim

**Mile widziane:**

*   Dobra znajomość protokołu HTTP
*   Doświadczenie z RabbitMQ lub innym brokerem wiadomości
*   Znajomość OAuth 2.0 i systemów rozproszonych
*   Doświadczenie w testach automatycznych (unit, integracyjne, E2E)
*   Znajomość Spock (Groovy DSL)
*   Doświadczenie w budowie CI/CD pipelines
*   Znajomość baz danych Oracle, MySQL lub MongoDB

**Zadania, które na Ciebie czekają:**

*   Projektowanie, rozwój i utrzymanie aplikacji webowej wspierającej platformę zarządzania danymi
*   Rozwój rozwiązań backendowych i frontendowych w środowisku chmurowym AWS
*   Praca nad skalowalnymi, serverlessowymi systemami przetwarzania danych
*   Praca w międzynarodowym środowisku
*   Udział w rozwiązywaniu złożonych problemów z obszaru scientific software engineering
*   Współtworzenie i rozwój oprogramowania open-source
*   Bezpośrednia współpraca z klientem i interesariuszami projektu

**Nasz proces rekrutacji**

Rozmowa z naszym Rekruterem -> Rozmowa z naszym Business Managerem -> Spotkanie z Klientem W uzasadnionych przypadkach po rozmowie z Rekruterem wprowadzamy dodatkowy etap weryfikacji technicznej

**Potrzebujesz więcej informacji?Skontaktuj się ze mną: dominika.toczyska@astek.netCo oferujemy**

*   Długoterminowa współpraca
*   Szkolenia techniczne, certyfikaty i podnoszenie kwalifikacji
*   Mentoring Competence Center - bycie członkiem społeczności CC od pierwszego dnia pracy jest szansą na rozwijanie swoich umiejętności, uczestniczenie w różnych konferencjach oraz dzielenie się wiedzą i doświadczeniem z ludźmi, którzy na co dzień mierzą się z tymi samymi wyzwaniami
*   Jasna ścieżka kariery
*   Pakiet benefitów pracowniczych (Multisport, prywatna opieka medyczna, ubezpieczenie na życie)
*   Przyjazną atmosferę pracy, imprezy integracyjne i spotkania team-buildingowe

**System rekomendacji**

Znasz kogoś, kogo zainteresuje ta oferta? Skorzystaj z naszego systemu rekomendacji i zgarnij bonus do 7000 zl! Link: https://astek.pl/system-rekomendacji/

**Klauzula informacyjna**

Administratorem Pana/Pani danych osobowych jest ASTEK Polska sp. z o.o. z siedzibą w Warszawie (00-133) przy Al. Jana Pawla II 22. Przysługuje Pani/Panu prawo do wglądu do danych, prawo żądania usunięcia danych itp. Szczegółowe informacje dotyczace przetwarzania znajdzie Pan/Pani TU:

http://astek.pl/polityka-prywatnosci W dowolnym momencie przysługuje Panu/Pani prawo do wycofania wyrażonych zgód. W razie wycofania zgód prosimy o kontakt e-mailowy na adres privacy@astek.pl lub pisemnie na adres administratora. Procedura dokonywania zgłoszeń przez sygnalistów w ASTEK Polska sp. z o. o. \[Link\]

**Nr ref**

AO219032

Fullstack Programista/Programistka  - Praca zdalna

**Key Responsibilities:**

*   **Cross-Continental Collaboration:** Work closely with U.S.-based teams to provide seamless "follow-the-sun" development and support.
*   **Technical Execution:** Design, develop, and implement software solutions tailored to the Pro Golf engagement's evolving needs.
*   **After-Hours Support:** Serve as the primary technical point of contact during U.S. off-hours to ensure 24/7 operational stability.
*   **Strategic Growth:** Assist in the transition and scaling of development operations within the Poland region.

**Key Features of PRO Golf:**

The platform consolidates data from the course into a single dashboard, accessible via desktop or mobile, to provide:

*   **Labor & Crew Management:** A digital "job board" that replaces traditional whiteboards. Managers can assign tasks, track crew hours, and receive alerts to prevent overtime costs.
*   **Fleet Tracking:** Provides real-time visibility into equipment location (updating every 5 seconds). It can distinguish between machines that are working, idling, or in transport.
*   **Maintenance & Parts:** Automates service schedules based on engine hours and tracks parts inventory. When a part is used for a repair, it is automatically deducted from the shop’s stock.
*   **Agronomic Insights:** Integrates with soil sensors and weather forecasting to help make data-driven decisions regarding irrigation and chemical applications.

**Skills/Tech Competencies:Front End:**

\- React / Node / TypeScript

**Back End:**

\- Node / Express/ GraphQL/ Java (moving off)

**Testing:**

\- Mocha / Jest

\- Cypress

**DB:**

\- Cassandra

\- PostgreSQL

**AWS Services:**

\- EC2 / RDS/ S3/ SNS/SQQS, ECS

React/Java/AWS/Node Developer - Contract

**Full Stack Engineer (Agentic AI)Salary: up to €80,000 depending on experienceLocation: Remote (Spain)Level: Mid/Senior**

Our client is building something new in the UK: a VC-backed, AI-enabled roll-up of a large, fragmented services sector. They buy excellent owner-operated businesses and turn them into a modern technology-led group. Two things make it work: disciplined M&A and serious integration. The first acquisitions are in, integrations are live, and the pipeline is deep. Integration is where the value actually gets created, and this role sits right inside that engine. If you want to be inside real businesses, with real teams and real problems, fixing things with your own hands, this is for you.

You'll be a core full stack engineer building agentic products end-to-end. That means designing the agent architecture, wiring up the tool layer, building the interfaces, and owning the infra that keeps it all running. You'll work across the stack with a small, senior team where the bar is high, and the loop from idea to production is short.

**The ideal candidate will have:**

*   Hands-on agentic development experience at a high-performance scaleup
*   Experience operating in an environment where things move fast, decisions are made with incomplete information
*   Full stack range. You're comfortable across the layers — frontend, backend, and infra

**Tech stack:**

*   Frontend: React
*   Backend: Python
*   Infra: AWS, Docker, Terraform

**The logistics**

*   Fully remote, but you must be based in EU
*   Salary up to €80,000 depending on experience
*   Mid-going-on-Senior level — typically 4–7 years of engineering experience

Full Stack Engineer

We are knowmad mood! Somos una compañía líder en transformación digital, en constante evolución y a la vanguardia de la tecnología. Nacimos para provocar un cambio real a través de la innovación y el desarrollo sostenible, con la misión de aportar valor a los clientes e impulsar nuestro talento. Formado por más de 3.000 personas creativas, digitales e innovadoras conectadas a un propósito y capaces de generar conexiones con personas de todo el mundo. Un equipo responsable, flexible y con alta capacidad de adaptación a las necesidades de nuestros clientes y del mercado, a la vez que proporciona valor, visión, creatividad, expertise, profesionalidad y pasión por la tecnología en cada proyecto. Los valores que marcan nuestro rumbo y nos guían hacia la excelencia son la colaboración, la innovación, el compromiso, la diversión y la conﬁanza. **¿Qué es lo que valoramos?** Experiencia de al menos 5 años en Desarrollador Frontend en:

*   Experiencia utilizando LitElements y Web Components para el desarrollo de componentes reutilizables y escalables.
*   Conocimientos avanzados en HTML, CSS, JavaScript y TypeScript, aplicados a proyectos modernos de desarrollo web.
*   Experiencia en creación de plantillas y maquetación web, asegurando una correcta implementación de diseño y usabilidad.
*   Aplicación de principios SOLID en el desarrollo de software, garantizando calidad, mantenibilidad y escalabilidad del código.
*   Participación activa en todas las fases del ciclo de vida del desarrollo de software: toma de requisitos, análisis, modelado, desarrollo, pruebas y mantenimiento.
*   Experiencia en la elaboración de documentación técnica clara y estructurada.
*   Capacidad de trabajo en equipo y comunicación efectiva con clientes y equipos multidisciplinarios.

**¿Cuáles serían tus funciones?**

*   Desarrollo con Web Components: Diseñar, desarrollar e implementar componentes reutilizables utilizando LitElements, asegurando estándares de calidad y buenas prácticas.
*   Maquetación y desarrollo Frontend: Crear interfaces modernas, accesibles y responsive mediante HTML, CSS, JavaScript y TypeScript.
*   Aplicación de buenas prácticas de desarrollo: Implementar principios SOLID y patrones de diseño que garanticen la escalabilidad y mantenibilidad del código.
*   Participación en el ciclo completo del proyecto: Colaborar en la definición de requisitos, análisis técnico, desarrollo, testing y mantenimiento evolutivo y correctivo.
*   Documentación técnica: Elaborar y mantener documentación detallada de las soluciones desarrolladas.
*   Colaboración multidisciplinaria: Trabajar junto a equipos de diseño, backend y negocio para asegurar la correcta implementación de soluciones alineadas con las necesidades del cliente.

**Además, valoraremos muy positivamente si tienes experiencia y/o conocimientos en:**

*   Arquitecturas frontend modernas y frameworks basados en componentes.
*   Testing de aplicaciones frontend (unitario, integración, e2e).
*   Herramientas de control de versiones (Git) y flujos de trabajo colaborativos.
*   Optimización de rendimiento en aplicaciones web.
*   Metodologías ágiles de desarrollo (Scrum, Kanban).

Y con nosotros podrás disfrutar de: ✅Contrato Indefinido ✅ **100% REMOTO** ✅Formación interna y acceso a certificaciones ♻Consulta nuestro calendario aquí: https://www.knowmadmood.com/es/talento/formacion ✅Plan de retribución flexible (seguro médico, transporte, tickets guardería, tickets restaurante) ✅Embajador de nuestra marca, a través de nuestro plan amigo ¡Recomienda a tus amigos y llévate un extra! ✅¡Eventos, meetups, techdays, charlas...y mucho más! ✅ 26 días de descanso (22 días vacaciones, 2 días de libre disposición y 24 y 31 diciembre festivos por defecto) ✅ Horario: 8.30 a 18h ( flexible) L-J y V 8 a 15h e Intensiva de Verano Julio y Agosto de 8 a 15h Para estar al corriente de nuestras novedades síguenos aquí -> knowmad mood _En_ **_knowmad mood_** _nos comprometemos con la igualdad de oportunidades y el respeto a la diversidad. Aplicamos nuestro Plan de Igualdad y el principio de no discriminación en todos nuestros procesos de selección._

Desarrollador/a Frontend Senior (Web Components / LitElement)

An immediate opportunity is available for a skilled React Developer to address critical issues in a production dashboard for a business application. The dashboard is already built, but several urgent fixes are required to ensure a seamless client demonstration. The role demands rapid troubleshooting, efficient problem-solving, and the ability to deliver high-quality results within a strict 24-hour timeframe. This is a fast-paced assignment ideal for a developer who thrives under pressure and can quickly adapt to existing codebases. Successful completion may lead to future collaboration on additional projects. **Deliverables**

*   Diagnose and resolve React dashboard rendering issues
*   Fix API integration bugs impacting data display and functionality
*   Repair authentication flow to ensure secure and reliable user access
*   Ensure mobile responsiveness across devices and browsers
*   Conduct final QA testing to verify all fixes and overall stability
*   Deploy the updated production build within the required timeframe

**Requirements**

*   Proven expertise in React.js and modern JavaScript (ES6+)
*   Strong experience with RESTful API integration and debugging
*   Familiarity with authentication flows (OAuth, JWT, etc.)
*   Ability to troubleshoot and resolve UI/UX issues rapidly
*   Experience with responsive design and cross-browser compatibility
*   Proficiency in version control (Git) and deployment processes
*   Excellent communication skills and ability to work independently under tight deadlines
*   Availability to start immediately and commit to a 24-hour turnaround

**About Twine** Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally. **Our Mission** Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Remote React Developer – Mid-Senior Contract

**Position**

_This role is offered on an Italian employment contract. Candidates must be based in Italy as we are unable to support remote working from outside the country due to local employment and tax legislation._

This role sits within the Vesper team at Deltatre — the platform powering live and on-demand streaming experiences for some of the world's most recognised media brands. You will work across web, React Native mobile, and connected TV (10-foot) applications, contributing to the component systems, performance standards, and delivery pipelines that underpin our clients' products.

We are hiring at two levels. Both roles are hands-on engineering positions for people who care about quality, take ownership of their work, and are comfortable in a cross-functional environment. The distinction lies in depth of experience, scope of contribution, and degree of independence expected.

**Senior Front-End Software Engineer**

For engineers who are ready to lead solutions and raise the bar for those around them.

As a Senior Front-End Engineer, you will take end-to-end ownership of features and solutions across our platform. Beyond your own delivery, you will contribute actively to how the team works — mentoring less experienced developers, shaping technical decisions at the solution and feature level, and helping establish standards that others build on.

Your day-to-day will include:

*   Design, build, and maintain high-quality front-end experiences across web, React Native mobile, and connected TV platforms (tvOS, Android TV / Fire TV, Samsung Tizen, LG webOS)
*   Take the lead on solution and feature design — bringing well-reasoned technical proposals and seeing them through to delivery
*   Mentor mid-level and junior developers through code review, pairing, and day-to-day guidance — helping build capability across the team
*   Contribute to and evolve our shared component library and design system, with a focus on consistency, accessibility, and long-term maintainability
*   Set a high bar for front-end performance — profiling, measuring, and improving rendering, load times, and analytics instrumentation
*   Collaborate with back-end engineers, QA, and product to define robust, scalable solutions
*   Contribute to CI/CD pipelines and front-end tooling, improving build reliability and developer experience
*   Stay current with the front-end ecosystem and bring emerging patterns and practice into the team

**Mid-Level Front-End Software Engineer**

For engineers with solid foundations who are ready to take on meaningful ownership and grow their craft.

As a Mid-Level Front-End Engineer, you will take ownership of features and components within the Vesper platform, working with increasing independence across our target environments. You will collaborate closely with senior engineers and contribute to a team culture where quality and continuous improvement matter.

Your day-to-day will include:

*   Build and maintain high-quality front-end experiences across web, React Native mobile, and connected TV platforms
*   Contribute to our shared component library and design system — writing reusable, accessible, maintainable code
*   Apply front-end performance principles — understanding how your code affects rendering, load times, and instrumentation
*   Participate in technical design discussions, asking good questions and contributing your perspective
*   Collaborate with back-end engineers, QA, and product teams to deliver robust solutions
*   Work within CI/CD pipelines and front-end tooling as a self-sufficient contributor
*   Develop your knowledge of the front-end ecosystem and apply it to your work

**RequirementsWhat we're looking for at Senior level**

You produce work that others learn from. You don't wait to be asked — you identify problems, propose solutions, and follow through. You understand that technical quality and team capability are inseparable, and you invest in both.

**Required**

*   Deep proficiency in TypeScript and modern JavaScript (ES6+)
*   Substantial production experience with React and React Native, including cross-platform delivery
*   Solid command of HTML and CSS/SCSS — responsive and adaptive layouts, flexbox, grid
*   Proven track record shipping apps across multiple targets: web, mobile (iOS/Android) and/or connected TV
*   Experience building and maintaining component libraries or design systems
*   Deep understanding of front-end performance — measurement, optimisation, and analytics integration
*   Experience with RESTful APIs or GraphQL
*   Comfortable working within CI/CD pipelines and modern front-end tooling
*   Demonstrated testing approach — experience with modern front-end testing frameworks and a test-first mindset
*   Clear communicator who can articulate technical decisions to peers and cross-functional stakeholders

**Valued**

*   Experience in the streaming or media industry — VOD, live events, player integrations, or DRM
*   Hands-on 10-foot development experience across Samsung Tizen, LG webOS, Apple TV, or Android TV / Fire TV
*   Familiarity with client-side data event instrumentation
*   Knowledge of Node.js, AWS (Lambda, S3, CloudFront), or back-end concepts
*   Curiosity about the full stack and how front-end decisions interact with broader system design

**What we're looking for at Mid level**

You can take a well-defined problem and run with it. You ask good questions early, flag blockers clearly, and deliver work you are proud of. You are actively developing your craft and open to the kind of feedback that accelerates that.

**Required**

*   Solid proficiency in TypeScript and modern JavaScript (ES6+)
*   Production experience with React and React Native
*   Good understanding of HTML and CSS/SCSS — responsive layouts, flexbox, grid
*   Experience shipping apps to at least one of: web, mobile (iOS/Android), or connected TV
*   Some experience with component libraries or design systems
*   Working knowledge of front-end performance concepts
*   Experience with RESTful APIs or GraphQL
*   Comfortable working within CI/CD pipelines and modern tooling
*   Experience with front-end testing frameworks and an appreciation for test-first development
*   Good communication skills and comfort working in an agile, cross-functional team

**Valued**

*   Any exposure to the streaming or media industry
*   Experience with 10-foot / connected TV development
*   Familiarity with client-side data event instrumentation
*   Awareness of Node.js, AWS, or back-end concepts
*   Curiosity about the full stack

**Who Thrives Here**

Across both levels, we look for people who bring rigour and curiosity to their work in equal measure. You take quality seriously — not as a constraint, but as a standard you set for yourself. You communicate clearly, flag issues early, and treat your colleagues' time and context with respect. You are honest about what you know and what you are still learning.

This is an environment that rewards initiative. If you are looking for genuinely interesting work on a technically demanding platform, alongside people who hold themselves to a high standard, this may be exactly right.

Not sure which level is right for you? Apply anyway and tell us where you think you sit. We'll figure it out together.

**Process and what to expect**

1.  **Introductory conversation:** this is a step for us to get to know each other better, and for us to answer all questions you might have around Deltatre.
2.  **Take-Home Assessment:** we have a coding challenge waiting for you, to grab a sense of what you'll be dealing with. This step is the entry point in our process, and mandatory to acccess to the followng steps.
3.  **1-hour Technical round of Interview:** we will use your Assessment as a starting point for a discussion with Senior team members in the video team. You will do code review and discuss additional technical aspects in details. This conversation, combined with the output of the assessment will allow us to make a solid technical evaluation.
4.  **1-hour Competency Based Interview:** we are going to ask you some situational questions around how you deal with real-life scenarios at work. Easier doing it, more than explaining it!

If any of these formats would be difficult for you, tell us — we adjust regularly and can usually accommodate.

Accessibility and accommodation questions are welcome at any stage, including before you apply. Tell us what would work for you.

Front-End Software Engineer

Macmillan is one of the Big 5 Publishers with mission-critical systems running royalties, distribution, and the supply chain that books move through from manuscript to consumer. Those systems cannot be turned off. They also cannot stay as they are. The organization has committed to a multi-year modernization of its core technology platforms, the build of a Publishing Operating System that enables imprints to operate more efficiently, and the productionization of AI capabilities across the publishing lifecycle. This is a rare opportunity to help redefine the technology foundation of a global publishing company in the AI era. This is a role for someone who has built and shipped AI-powered products at scale and now wants to shape the technical future of an industry that is being fundamentally transformed by AI. **THE ROLE** As a Senior AI Engineer (Full-Stack / Applications), you will design, build, and operate production-grade, cloud-native applications with AI at their core. This role sits at the intersection of strong software engineering and deep AI expertise, with a focus on turning state-of-the-art AI capabilities into robust, scalable, and high-quality user-facing products. This role prioritizes deep AI knowledge alongside strong software engineering skills to ensure an effective utilization of AI capabilities in production systems. You will work across the full lifecycle of AI-powered systems: from evaluating and optimizing models, to integrating them into end-to-end applications, to deploying, monitoring, and iterating on them in production. Candidates may bring deeper expertise in either application development or applied AI, and we value engineers who are excited to collaborate and grow across disciplines. We do not expect candidates to match every technology or qualification listed below. Strong candidates will bring deep expertise in some areas alongside curiosity, adaptability, and strong collaboration skills. In this role you will be flexibly assigned to short-term PoC projects, mid-term rapid MVP projects and long-term product development, based on your skills, interests, and company priorities. Our current and future tech-stack: Google Cloud, AWS, Firebase, Python, Typescript, Django, Terraform, Github, Cloud Firestore, EventArc, PubSub, GCIP, Cloud Storage, Cloud Functions v2, React, BigQuery, Github Actions, commercial AI services, Open Source AI Models, Langfuse, Snowflake, PostgreSQL. **What You Will Be Doing**

*   Own AI-powered features end-to-end, from scoping, design and requirements engineering to feature evaluation, deployment and operation.
*   Design, build and maintain cloud-native, event-driven AI applications across the full stack.
*   Evaluate, integrate, and optimize AI models for production use, balancing quality, latency, reliability and cost.
*   Collaborate effectively with cross-functional team members, including non-technical stakeholders, to refine requirements and align technical solutions with business objectives.
*   Build and maintain robust AI inference, evaluation, and monitoring pipelines.
*   Develop and implement robust, automated AI application evaluation frameworks.
*   Analyze AI application performance data and experiments, using insights for data-driven improvements.
*   Operate and improve production systems, taking ownership of reliability, quality, and technical debt.
*   Stay current with AI advancements and share knowledge to upskill the team.
*   Plan, track, and break down work effectively in an agile team.
*   Provide technical leadership, drive design reviews, write ADRs and contribute to hiring and onboarding.
*   Participate in on-call rotations, incident response and post-mortems for AI-powered systems and help define SLOs and error budgets.

**What We Are Looking For**

*   Pragmatic, result-oriented analytical problem solving skills that can overcome ambiguity.
*   Friendly, concise, audience-oriented communication in written and spoken form (English) with effective asynchronous communication.
*   Self-organized, purpose-driven individual that likes to collaborate with and enable their team.
*   A T-shaped engineer with strong general software engineering and AI skills, paired with deep expertise in at least one area:

*   Frontend: Advanced experience with React and TS, building high-quality, user-facing apps.
*   Backend: Deep experience designing and operating scalable, event-driven Python systems in cloud-native environments.
*   AI: In-depth knowledge of frontier AI models, evaluation, integration into AI-powered product features, and production best practices.

*   Strong theoretical understanding and practical experience with current AI model internals.
*   Proven experience with AI model deployment & utilization strategies, evaluation methodologies, and monitoring frameworks in production environments.
*   Proven experience owning features end-to-end, from technical design to production.
*   Strong understanding of how to integrate AI into production systems, including the challenges of non-deterministic behavior.
*   Solid understanding and practical application of MLOps and LLMOps best practices for AI applications.
*   Familiarity and hands-on experience with major AI service providers and their offerings.
*   Working knowledge of fine-tuning methods and their appropriate application.
*   Strong software engineering skills with the ability to bridge AI research/concepts and robust, production-ready engineering implementations.
*   Experience breaking down complex AI objectives into requirements & actionable tasks.
*   Experience leveraging and refining agile practices and processes within an AI/ML team context, including effective requirements, design, and code reviews.
*   Proven experience in quickly assessing and adopting new technologies & frameworks.
*   Able to implement Clean Architecture & Onion Architecture principles.
*   Experience building and operating cloud-native systems, ideally on Google Cloud / Firebase with solid DevOps and MLOps fundamentals, including CI/CD, observability, and Infrastructure as Code.
*   Working knowledge of AI safety and security.
*   Solid testing discipline across the stack.
*   Mentorship and technical-leadership experience: growing other engineers, leading design reviews, and influencing technical direction across teams.
*   Working knowledge of AI safety and security: OWASP Top 10 for LLMs, prompt injection, data exfiltration risks, content moderation, and PII / GDPR handling.
*   Solid testing discipline across the stack - unit, integration, and contract tests for both deterministic code and AI components.
*   Experience operating production systems on-call

**What We’d Love To See**

*   Experience in the publishing or media industry
*   Experience with our entire TechStack
*   Experience with MLOps on Vertex AI & Weights and Biases
*   Experience in applied research
*   Experience applying & implementing SRE methodologies
*   Advanced understanding of ML, LLMs and trends in the AI market
*   Specialized, deep expertise in a relevant area.

The salary range for this position is $150,000 - $160,000. _This position is classified as remote but is tied to our New York, NY office located at 120 Broadway. Employment is subject to New York State tax withholding under applicable regulations._ Macmillan Publishers is the U.S. trade company that is part of the Holtzbrinck Publishing Group, a large family-owned group of media companies headquartered in Stuttgart, Germany. Holtzbrinck Publishing Group's publishing companies include prominent imprints around the world that publish a broad range of award-winning books for children and adults in all categories and formats. U.S. publishers include Celadon Books, Farrar, Straus and Giroux, Flatiron Books, Henry Holt & Company, Macmillan Audio, Macmillan Children’s Publishing Group, The St. Martin's Publishing Group, and Tor Publishing Group. In the UK, Australia, India, and South Africa, companies in the Holtzbrinck Publishing Group publish under the Pan Macmillan name. The German publishing company, Holtzbrinck Deutsche Buchverlage, includes among its imprints S. Fischer, Kiepenheuer & Witsch, Rowohlt, and Droemer Knaur. Macmillan is proud to be an equal opportunity employer consistently striving to foster a culture where everyone belongs. We welcome applicants of all backgrounds and identities. Qualified applicants are evaluated without regard to race, color, religion, age, ethnicity, national origin, sex, sexual orientation, gender identity or expression, disability status, physical ability, neurodiversity, genetic information, protected veteran status, family and economic status and background or any other characteristic protected by federal, state, or local law. We prohibit discrimination of any kind and will provide reasonable accommodations to qualified individuals with disabilities in accordance with applicable law.

Senior AI Engineer

**This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior React Native Developer (Crypto Wallet & Card) in United States.** This role sits at the intersection of fintech innovation and blockchain technology, focused on building and scaling a non-custodial crypto wallet and card ecosystem used by a global user base. You will work on high-impact user-facing features such as transactions, balances, swaps, bridges, on-ramp flows, and card/payment experiences. The environment is highly product-driven, where engineering, design, and product teams collaborate closely to shape the future of digital finance. You will take full ownership of critical mobile application components, ensuring performance, security, and usability at scale. The role offers significant autonomy, end-to-end responsibility, and the opportunity to influence architecture and product direction. It is ideal for engineers passionate about crypto, mobile performance, and modern React Native ecosystems. **Accountabilities**

*   Own and evolve core wallet functionality including send/receive flows, balances, transaction history, swaps, bridging, and on/off-ramp experiences.
*   Lead development of extended product features such as crypto card integration, IBAN-like payment systems, subscriptions, onboarding, and multi-provider expansion across regions.
*   Drive full lifecycle ownership of features from architecture and planning to implementation, testing, deployment, monitoring, and iterative improvements.
*   Collaborate closely with Product and Design teams to translate user needs into scalable, high-quality mobile experiences.
*   Partner with QA and backend teams to ensure reliability through testing strategies, documentation, and reproducible workflows.
*   Participate in on-call rotation and contribute to system reliability and incident resolution.
*   Produce clear technical documentation and occasionally support internal demos for stakeholders and support teams.

**Requirements**

*   5+ years of frontend engineering experience, including at least 3+ years in React Native production applications.
*   Strong background in fintech or crypto products, ideally with experience in non-custodial wallets and on-chain transactions.
*   Expert-level proficiency in React, React Native, and TypeScript with solid testing practices (Jest, Detox).
*   Experience with modern mobile tooling and libraries such as React Query, Redux Toolkit, Zustand, WalletConnect, Reanimated, Skia, Sentry, and Firebase.
*   Strong understanding of blockchain ecosystems including EVM-compatible networks, Bitcoin, Tron, Solana, and TON.
*   Comfortable working with Git workflows, CI/CD pipelines, and automated production release systems.
*   Strong security mindset, particularly around applications handling real user funds.
*   Ability to conduct technical research, evaluate trade-offs, and make data-driven architectural decisions.
*   Comfortable using AI tools to improve development speed and quality in a practical, engineering-focused way.
*   Upper-Intermediate English level; fluency in Russian is required.

**Benefits**

*   Fully remote work within an international and agile engineering environment.
*   High-impact role with ownership over key product areas in a fast-growing fintech ecosystem.
*   Strong engineering culture supporting modern tools, experimentation, and technical autonomy.
*   Competitive salary based on experience and performance.
*   Clear career growth opportunities in a forward-thinking product organization.
*   Transparent feedback culture focused on ownership, collaboration, and measurable impact.

**How Jobgether Works** We use an **AI-powered matching process** to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team. We appreciate your interest and wish you the best! Why Apply Through Jobgether? **Data Privacy Notice:** By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Senior React Native Developer (Crypto Wallet & Card)

**Senior Front-End Engineer (React + Foundry)6 MonthsOakland, CA 94612 (100% REMOTE)About the Role:** We are seeking a Senior Frontend Engineer to join the WiRE platform team supporting client's wildfire mitigation and compliance reporting systems. WiRE is a data platform built on Palantir Foundry that provides trusted, auditable data for internal reporting and regulatory submissions (OEIS / WMP). The platform includes a React-based frontend hosted within Foundry, enabling users to explore, validate, and extract compliance data. This role focuses on building data-driven user interfaces that integrate tightly with Foundry datasets and ontology objects, enabling scalable and audit-ready workflows

**What You’ll Do:**

*   **Frontend Development**Build and maintain React + TypeScript applications integrated into the Foundry platform
*   Develop reusable UI components for:
*   Data exploration (filters, drill-downs)
*   Data validation workflows
*   Data extraction and submission flows
*   **Data Integration (Key Focus Area)**Integrate frontend applications with Palantir Foundry Ontology (via SDK/APIs)
*   Consume structured datasets and ensure UI components align with evolving data schemas
*   Collaborate with backend engineers to define and enforce data contracts and interfaces
*   **Compliance & Audit-Focused UI**Design interfaces that support auditability, traceability, and data transparency
*   Ensure frontend outputs align with regulatory reporting requirements (OEIS, WMP)
*   Minimize business logic in the UI and rely on validated backend datasets

**Validation & Submission Workflows**

*   **Build user flows for:**File upload and schema validation
*   Real-time validation feedback (pass/fail messaging + detailed logs)
*   Support structured, scalable validation frameworks for compliance data

**Product & Stakeholder Collaboration**

*   **Work closely with:**Data engineers (Foundry pipelines)
*   Product managers and PMO stakeholders
*   SME teams defining reporting requirements
*   Participate in agile workflows (planning, backlog refinement, delivery cycles)
*   **Required Qualifications**Strong experience with React (enterprise applications)
*   Proficiency in TypeScript
*   Experience building data-driven UI applications (API-integrated frontends)
*   **Solid understanding of:**Data modeling concepts (schemas, structured datasets)
*   Performance considerations for large datasets in UI
*   **Preferred Qualifications**Experience with Palantir Foundry or similar data platforms
*   **Experience integrating frontend applications with:**SDKs / APIs for structured data access
*   Ontology-based or metadata-driven systems
*   Exposure to compliance, audit, or regulated environments
*   **Experience with:**Data validation or quality frameworks
*   Internal enterprise tools or platforms

**Applicant Notices & Disclaimers**

*   For information on benefits, equal opportunity employment, and location-specific applicant notices, click here

At SPECTRAFORCE, we are committed to maintaining a workplace that ensures fair compensation and wage transparency in adherence with all applicable state and local laws. This position's starting pay range is: $60.00 - $79/hr.

Frontend Developer (React+Foundry)

We’re Watts. Together, we’re reimagining the future of water. We feel proud every day about what we do. We're all part of the same crucial mission, no matter what function we support -- it's to provide safe, clean water for the world, and to protect our planet's most valuable resource. **What We Do** For 150 years, Watts has built best-in-class products that are trusted by customers in residential and commercial settings across the world. We are at the forefront of innovation, working with cutting-edge technology to provide smart and connected, sustainable water solutions for the future. Watts is a leading brand with a quality reputation — and we have a dynamic future ahead. **Scope of Position** This highly skilled mobile engineer, as part of the Digital Engineering team, will be responsible for building modern, scalable, and high-performance mobile applications. This role bridges design and engineering to deliver intuitive, reliable, and device-aware mobile experiences that support customer workflows and scale across multiple teams and products. _This position has no direct supervisory responsibility._ **Primary Job Duties And Responsibilities**

*   Write clean, maintainable, and reusable mobile code in TypeScript and React Native, participating in code reviews to ensure adherence to standards and best practices
*   Build responsive and accessible mobile user interfaces that support both portrait and landscape orientations
*   Integrate and manage device-specific features such as Bluetooth peripherals, push notifications, vibration and haptic feedback, geolocation, camera access, sensors, and orientation changes
*   Develop and maintain reusable mobile components and shared UI patterns to ensure consistency across applications and platforms
*   Translate product requirements and design mockups into functional, mobile-first experiences optimized for both iOS and Android
*   Collaborate closely with product managers, designers, and backend engineers to deliver cohesive end-to-end solutions
*   Optimize mobile application performance, battery usage, and responsiveness, including efficient handling of large data sets and background tasks
*   Implement automated testing for mobile workflows using tools such as Jest, React Native Testing Library, Detox, or similar frameworks
*   Manage mobile release processes, including building, signing, and submitting applications to the Apple App Store and Google Play Store, ensuring compliance with platform guidelines
*   Evaluate emerging mobile technologies, libraries, and frameworks and recommend solutions that improve application capabilities and developer productivityAssume responsibility for other projects and duties as assigned by direct leader or Company management.
*   Responsibility directly tied to Watts Value (Integrity, Accountability, Continuous Improvement, Transparency.)
*   Travel Requirements: 10% travel to support training, meetings, etc. as needed.

**Required Qualifications**

*   Bachelor’s degree in Computer Science or a related field, or equivalent professional experience
*   Minimum of 5 years of professional front-end development experience, including at least 2 years focused on React Native and TypeScript
*   Hands-on experience with modern build tools such as Vite, Parcel, or Webpack
*   Experience working in monorepo environments using Nx or Turborepo
*   Proficiency with schema validation libraries such as Zod or equivalent tools
*   Experience building interactive data visualizations using D3, Plotly, or similar libraries
*   Experience with modern state management patterns and front-end testing frameworks
*   Strong troubleshooting skills related to browser performance and UI reliability
*   Understanding of and adherence to applicable laws, codes, policies, regulations, and safety practices and procedures, as applicable.
*   Must successfully establish employment eligibility and satisfactorily complete background checks, as a condition of employment.

**Preferred Qualifications**

*   Master’s degree in computer science or a related field
*   Experience contributing to design systems or reusable component libraries
*   Deep knowledge of UI performance optimization techniques
*   Strong problem-solving, critical thinking, and communication skills
*   Passion for creating rich, intuitive, and innovative user experiences

**General Applicable Company Competencies**

*   Commitment to Watts’ values of integrity, accountability, continuous improvement and innovation, and transparency.
*   Punctuality and dependability.
*   Ability to be flexible and adapt to changing work priorities and stressful conditions.
*   Adherence to all personnel policies, procedures, and standards of process as implemented by Watts.
*   Maintain productive and collaborative relationships with other Watts employees.
*   Adherence to Watts’ seven cultural beliefs: Growth Mindset, Customer-Focused Innovation, Constant Communication, Clear Goals, Collaborate Globally, Be Inclusive, and Take Action.

**Working Conditions** _While performing the job duties, you will be working remotely in an office environment. You may be required to occasionally travel to and work in the office on location for meetings, trainings, or as otherwise required by Company management._ **Physical Requirements**: _Specific physical abilities required for this position include, but are not limited to:_

*   Ability to remain seated at a desk or workstation for extended periods.
*   Ability to perform repetitive tasks like typing on a keyboard or using a mouse for extended periods.
*   Ability to physically move around the office, organize or transport files, packages, or other office-related materials.
*   Ability to read documents, use a computer, and perform data entry tasks.
*   Ability to communicate clearly with management and coworkers, particularly in meetings or phone calls.
*   Ability to operate standard office equipment such as computers, printers, phones, and copiers.
*   Ability to occasionally lift and carry light objects, such as office supplies, documents, or small equipment.

**Pay Range** The expected salary range for this position is _$__122-138k_ yearly. Actual compensation will be dependent upon individual skills, experience, qualifications, and applicable law. Nothing in this job description restricts Watts’ right to assign or reassign duties, responsibilities, and working hours/conditions to this position at any time. This position is “at will,” which means that either the employee or Watts may terminate the employment relationship at any time, with or without notice, and for any lawful reason. **(Remote)Watts In It For You_Please note that the following_ _benefits apply only to permanent roles and do not apply to internship roles._**

*   Competitive compensation based on your skills, qualifications and experience
*   Comprehensive medical and dental coverage, retirement benefits
*   Family building benefits, including paid maternity/paternity leave
*   10 paid holidays and Paid Time Off
*   Continued professional development opportunities and educational reimbursement
*   Additional perks such as fitness reimbursements and employee discount programs
*   Learn more about our benefit offerings here: https://tapintowattsbenefits.com/

**How We Work** At Watts, our culture is team-oriented and supportive. Employees here genuinely care about the quality of their work, and about each other. Our people are the heart of who we are and contribute to our longevity and continued success. And this is a place where you can have a big career. No matter your role, there are opportunities for learning and development, and your daily contributions make a meaningful impact on the lives of people who use our products and on the future of water. Watts is committed to equal employment opportunity. We follow a policy of administering all employment decisions and personnel actions without regard to race, color, religion, creed, sex, pregnancy, national origin, sexual orientation, age, physical or mental disability, genetic disposition or carrier status, marital status, military or veteran status, minorities, or any other category protected under applicable federal, state, or local law. Consistent with the obligations of state and federal law, Watts will make reasonable accommodations for qualified individuals with disabilities. Any employee who needs a reasonable accommodation should contact Human Resources.

Senior React Developer with Java - Freelancer

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