Buscamos un/a **Senior Frontend Developer** para unirse a un equipo tech internacional que desarrolla un **SaaS B2B white-label** dentro del sector música/tech.

Rol con impacto real en producto, ownership técnico y liderazgo de frontend.

**Contrato freelance, inicialmente 7 meses, renovables**

🎯 Qué harás

*   Diseñar y desarrollar interfaces web complejas y escalables.
*   Liderar el frontend squad: definir estándares, buenas prácticas y arquitectura.
*   Aportar mentoring y liderazgo técnico.
*   Colaborar con producto, diseño y stakeholders.
*   Asegurar calidad, mantenibilidad y observabilidad del código.

🛠️ Stack & requisitos

*   +5 años de experiencia en **Frontend**.
*   **React** muy sólido.
*   **TypeScript / JavaScript** avanzado.
*   Experiencia real aplicando **Clean Code** y buenas prácticas.
*   Conocimiento del **SDLC** y trabajo orientado a producto.
*   Experiencia con **npm, yarn, webpack**.

➕ Nice to have

*   Conocimientos básicos de backend (**PHP / Symfony**).
*   Testing con **Jest y/o Cypress**.
*   Docker / Kubernetes (nivel conceptual).
*   Observabilidad: **Grafana, OpenTelemetry, GA**.
*   Estar en **Barcelona**.

🧠 Soft skills clave

*   Comunicación clara (tech & non-tech).
*   Proactividad y resolución de problemas.
*   Mentalidad de producto y foco en UX.
*   Buen manejo de prioridades y deadlines.
*   Perfil colaborativo.
*   **Inglés alto (imprescindible)**.

Senior Frontend Developer Freelance

**Position:** Software Engineering Expert **Type:** Hourly contract **Compensation:** $50–$150 per hour **Location:** Remote **Commitment:** Part-time, approximately 15–25 hours per week (with flexibility to increase) **Role Responsibilities**

*   Review and refine AI-generated prompts, responses, and code
*   Validate algorithms and software concepts for technical accuracy
*   Provide structured feedback on solution quality, correctness, and clarity
*   Tag and organize content by topic, difficulty, or programming language
*   Support benchmarking efforts to assess AI model capabilities

**Requirements**

*   Strong experience in software engineering, technical research, or technical content development
*   Bachelor’s degree in Software Engineering, Computer Science, or a related field
*   Strong experience with one or more programming languages such as Python, JavaScript, Java, or C++
*   Strong experience debugging, testing, and validating code
*   High attention to detail and comfort with technical writing
*   Ability to work independently in a remote, project-based environment

**Application Process (Takes 20 mins)**

*   Upload resume
*   Interview
*   Submit form

Senior Software Engineer (Python | JavaScript | Java) –  Consultant | Remote

We are looking for a professional with Three.js or someone who has experience with other 3D visualization frameworks HTML5 Canvas using Fabric.js.

we do a lot of "mapping" of points of interest, geospatial. Anyone who has done high-performance visualization of 3D graphics / scenes in a browser

**Key Abilities**

Strong communication and organization skills, as well as a "team-first" mentality;

Strong aptitude with technology, including Excel, Google Workspace, Slack, Asana, and other tech tools; and Willingness to learn new skills and technology.

Three.JS Developer | 3D

**Position:** Software Engineer (Front-end) **Type:** Hourly contract **Compensation:** $70–$80/hour **Location:** Remote **Commitment:** 10–40 hours/week **Role Responsibilities**

*   Write realistic, self-contained prompts for client-side web applications, games, tools, and simulations.
*   Create precise, binary evaluation rubrics tagged by verification type.
*   Ensure rubric items are pass/fail and verifiable through screenshot and code inspection.
*   Develop high-quality datasets focused on UI behavior, interactivity, robustness, and state management.
*   Apply frontend engineering expertise to evaluate correctness and user experience.
*   Collaborate asynchronously with research and review teams.

**Requirements**

*   Professional experience in frontend or full-stack development.
*   Strong proficiency in JavaScript, TypeScript, React, or vanilla JS.
*   Ability to write clear technical specifications and structured evaluation criteria.
*   Strong analytical thinking and attention to detail.
*   Comfortable working independently in a remote, deliverables-driven environment.
*   Bachelor’s degree in Software Engineering, Computer Science, or related field preferred.

**Application Process (Takes 20 Min)**

*   Upload resume
*   Interview (15 min)
*   Submit form

React/JavaScript Engineer | $80/hr Remote

**Be | Shaping the Future Poland** has a proven position of being a reliable partner for financial services organisations to analyse complex requirements, find solutions and implement them in their entirety, regardless of their complexity. Since the foundation of **Be Poland in 2013**, we have been continually expanding and customising our spectrum of services.

We are currently looking for a **Front-End Engineer** to work for one of our clients in the payment sector.

**Requirements**:

*   several years of experience as a Software Engineer working with **Flutter**, **native mobile (iOS or Android), or React Native**
*   experience with popular **Flutter libraries, tools and its lifecycle**
*   passionate about building great products in small, autonomous, agile teams
*   automation tests and experience writing testable code
*   experience building sleek, high-performance user interfaces and complex Mobile apps that successfully shipped to customers
*   leveraging automation and toolings, focussed in Continuous Integration, Delivery and Deployment

**Our offer:**

*   Competitive remuneration on B2B contract
*   Access to Mindgram – mental health & well-being platform
*   Free gym at Q22
*   Personal development – internal online / onsite DevTalks
*   Referral bonus program
*   International environment

Frontend Engineer - Payments

**Salary:20 500 - 24 500 PLN net + VAT (B2B) / 17 000 - 20 500 PLN gross (UoP) + uncapped sales commission (bonus)**

_We don’t follow best practices, we set them!_

**Join a team that’s shaping the future of mobile tech - and sell what truly sells itself.**

We’re not just another software house. We’re a team of top-tier cross-platform development experts, co-creating the future of React Native & AI, being a Founding Member of React Foundation. We collaborate with Silicon Valley startups, Fortune 500 giants, and everything in between. Our name carries weight in the developer community - and that opens doors. Big ones.

**Who we’re looking for?**

We’re on the lookout for a **Senior Business Development Manager** with a hunter’s mindset and a proven track record in closing high-value deals.

We’re looking for someone who gets a thrill from opening doors, starting conversations from scratch, and turning them into six-figure partnerships. Someone who’s strategic, relentless, and knows how to position value - not just pricing.

From day one, you’ll take the lead in driving your own outreach, building relationships, and closing deals with high-profile clients - especially in the US market. You’ll be the face of Callstack at industry-leading conferences and business meetings around the globe, turning interest into opportunity. Your job is to keep the pipeline strong and deals moving.

We’ll back you with a powerful technical brand, support from our marketing and engineering teams, and access to top-tier events. But we’ll also expect you to bring your own ideas to the table - and run with them.

**What’s in it for you?💼 You’re not starting from scratch**

We already work with top-tier enterprise clients. You’ll sell solutions backed by proven delivery, a strong reputation, and the kind of tech talent that Silicon Valley respects.

**🎯 A clear niche and sharp positioning**

We’re laser-focused on cross-platform development. You won’t need to explain who we are - our name carries weight in the React Native ecosystem.

**✈️ You’ll go places - literally**

Attend and represent Callstack at the biggest tech conferences in the US and beyond. We also organize industry-leading events ourselves - and you’ll be part of it.

**🇺🇸 Work with the US market**

Sell to innovation-driven companies where budgets are high, expectations are clear, and value is everything.

**🤖 We’re leaning into AI - and so will you**

We’re actively investing in AI-powered solutions and internal tooling. You’ll be part of shaping how we sell and deliver with tomorrow’s tools.

**📈 Full ownership over deals**

You drive it, you close it, you own it. From the first handshake to the signed contract.

**💡 Challenger Sales training & mindset**

We believe in value-based selling. You’ll get access to training and support to sharpen your consultative sales game.

**🤝 All hands on deck**

You’ll have full access to our tech experts, marketing, and leadership team. We won’t micromanage - but we expect you to make smart use of the support we offer.

**💰 Earn big, close big**

Bring in big deals? You’ll see that reflected in your commission. Simple as that.

**What we offer:**

*   24 paid days off & 30 days paid sick leave for B2B contractors
*   Fully-covered life insurance
*   Private healthcare for you and your family
*   Free access to mental health platform - Helping Hand
*   Multisport Card or monthly allowance for other sports activities
*   Individual Wellbeing & Development Budget
*   Monthly lunch allowance
*   Accounting costs refund for B2B contractors
*   Flexible working hours and fully remote work possibility
*   Sales commission from every deal you complete (no cap)
*   Cool office in Wrocław city center
*   Magnificent team events and activities
*   Company-wide workation and team building workshops
*   Top-notch hardware - Apple devices
*   Possibility to participate in React Universe Conf

Business Development Manager

**La tua nuova azienda:**

Hays Solutions, società del gruppo multinazionale Hays, quotata al London Stock Exchange, offre servizi di consulenza mirati all'individuazione, alla comprensione e al raggiungimento degli obiettivi concreti di un progetto di business in ambito IT, Engineering o Digital.

Siamo alla ricerca di un **Mobile Developer**, con focus su **React Native**.

**Cosa avrai in cambio:**

*   Offriamo una collaborazione freelance di lunga durata / contratto di assunzione con Hays Solutions.
*   Disponibilità: **Full time**
*   Modalità di lavoro: **Full remoteCosa devi fare ora:**

*   Se sei interessato a questa opportunità, clicca su "Candidarsi ora" per inviare una copia aggiornata del tuo CV.
*   Se questa opportunità non è in linea con le tue aspettative, ma sei alla ricerca di un nuovo lavoro, visita il nostro sito Internet per scoprirne di nuove.
*   I candidati di ambo i sessi, dopo aver visionato l'informativa obbligatoria sulla privacy sul sito www.hays.it, sono pregati di inviare il CV, indicando il codice «Rif» nella colonna Riepilogo a destra.
*   Hays S.r.l. Agenzia per il Lavoro Accreditata: Aut. Min. N. 13/I/0007145/03.04 del 1 Aprile 2008.

React Native Developer

**Work where work matters.**

We are a global technology group built for what's next, offering high calibre professionals the platform for high stakes work, the kind of work that defines an entire career. When you join us, you're not just taking on projects, you're solving problems that don't even have answers yet.

You will join an exclusive roster of talent that global leaders, including Google, Snap, Diageo, PayPal, and Jaguar Land Rover call when deadlines seem impossible, when others have already tried and failed, and when the solution absolutely has to work.  

Forget routine consultancy. You will operate where technology, design, and human behaviour meet to deliver tangible outcomes, fast. This is work that leaves a mark, work you'll be proud to tell your friends about.

We look for people who embody:

**Innovation** to solve the hardest problems.

**‍Accountability** for every result.

**‍Integrity** always.

**About The Role**

At Qodea, we believe in work that leaves a mark. This role is for the innovative people who thrive on solving problems that don't have answers yet, for those who are accountable for tangible outcomes, and for individuals who act with integrity when it absolutely has to work. Here, you will be responsible for leading the design and development of full-stack applications using Java and React, acting as both a technical consultant and a hands-on developer. You will have the opportunity to shape the direction of our projects while mentoring junior engineers and preparing for a future lead position.

**RequirementsRole Responsibilities**

*   Lead the design and implementation of full-stack applications using technologies like Java, Python and Typescript. Have experience or exposure to frameworks like Spring, Flask and React
*   Act as a technical consultant, providing insights and solutions to complex problems
*   Mentor and coach junior developers, fostering a culture of continuous learning
*   Collaborate with cross-functional teams to define and implement best practices
*   Participate in code reviews, ensuring high-quality standards are maintained
*   Drive architectural decisions and contribute to the overall technical strategy
*   Manage project timelines and deliverables, ensuring alignment with business objectives

**Essential Experience:**

*   Demonstrated experience in full-stack development. A minimum of one back end and one front end language such as Java, Python, Javascript/Typescript
*   An understanding of AI powered development practices and how they can improve the SDLC
*   Strong background in software design patterns and architectural principles
*   Proven ability to lead technical projects and mentor team members
*   Excellent problem-solving skills and the ability to work independently
*   Demonstrable experience in Agile methodologies and DevOps practices

**Desirable Experience**

*   Experience with cloud platforms (AWS, Azure, or Google Cloud), including serverless technologies
*   Familiarity with containerization technologies (Docker, Kubernetes)

**Benefits**

We believe in supporting our team members both professionally and personally. Here's how we invest in you:

**Compensation and Financial Well-being**

*   Competitive base salary
*   Discretionary company bonus scheme
*   Employee referral scheme
*   Meal Vouchers

**Health and Wellness**

*   Health Care Package
*   Life and Health Insurance

**Work-Life Balance and Growth**

*   Bookster
*   28 days of annual leave
*   Floating bank holidays
*   An extra paid day off on your birthday
*   Ten paid learning days per year
*   Flexible working hours
*   Sabbatical leave (after 5 years)
*   Work from anywhere (up to 3 weeks per year)
*   Industry-recognised training and certifications
*   Bonusly: employee recognition and rewards platform
*   Clear opportunities for career development
*   Length of Service Awards
*   Regular company events

**Diversity and Inclusion**

At Qodea, we champion diversity and inclusion. We believe that a career in IT should be open to everyone, regardless of race, ethnicity, gender, age, sexual orientation, disability, or neurotype. We value the unique talents and perspectives that each individual brings to our team, and we strive to create a fair and accessible hiring process for all.

Principal Software Engineer- Full Stack - Java / Python Backend + React

**Company Description**

Savages Corp is a leader in providing cutting-edge data solutions for the insurance, financial services, and property technology sectors. We empower businesses to thrive in a data-driven world by delivering insights through advanced analytics and tailored strategies. Our expertise includes data integration, predictive analytics, risk management, and custom software development. Known for our reliability and scalability, we focus on meeting the unique needs of each client with a commitment to excellence. Join Savages Corp to be part of transforming data into actionable insights and driving sustainability in competitive industries.

At **Savages Corp Limited**, we enable manufacturers to thrive in the era of Industry 4.0. We are seeking a _Full Stack Solution Engineer_ who can bridge the gap between factory-floor reality and cloud scalability. 

**The Mindset We Are Looking For**

*   **Systemic Thinking:** You see the entire flow—from the physical sensor to the analytical dashboard—rather than just isolated tasks.
*   **Proactive Ownership:** You don't wait for a detailed spec; you propose architectural refinements and take responsibility for integration strategies from concept to deployment.
*   **Full-Stack Versatility:** You are as comfortable optimizing a ClickHouse query as you are crafting a clean, intuitive UI for various clients.
*   **Architectural Curiosity:**You challenge assumptions and proactively design scalable solutions that survive 10 x times growth.

**Key Responsibilities**

*   **End-to-End Development:** Design, build, and maintain cloud-based services, data pipelines, and the front-end interfaces that bring Industry 4.0 use cases to life.
*   **Industrial Integration:** Collaborate with PLC technicians to integrate industrial control systems (PLC, SCADA, MES) into event-driven cloud environments.
*   **Data Visualization & UX**: Create responsive, high-performance web applications using modern frameworks (Next/React/Vue) to visualize processes and real-time data.
*   **Cloud & Performance Engineering:** Deploy serverless and containerized services on AWS (Lambda, IoT Core) and optimize ClickHouse schemas for massive scale.
*   **System Health:** Take ownership of monitoring and observability to ensure high availability for mission-critical industrial data flows.
*   **Strategic Contribution:** Lead architectural discussions, ensuring software meets rigorous security and compliance standards while incorporating AI automations.

**What you bring:**

*   **Experience:** 5–7+ years in Backend or Data Engineering, with at least 2+ years of experience delivering modern Front-End applications.
*   **Technical Stack:** Proficiency in Node.js, Python, and/or Go.
*   **Front-End Mastery:** Experience with JavaScript/TypeScript and frameworks like Next.js, React, Angular, or Vue.js.
*   **Data Expertise:** Practical experience with ClickHouse (schema design), PostgreSQL, and Apache Kafka in event-driven architectures.
*   **Cloud Mastery:** Strong hands-on experience with AWS (IoT Core, Kinesis, Glue) and familiarity with Azure. Other cloud environments are a bonus.
*   **Domain Knowledge:** Background in Industry 4.0, IoT, or manufacturing; familiarity with PLC/SCADA integration is a major advantage.

**What we offer:**

*   **Full Ownership:** A fast-moving environment with minimal bureaucracy and maximum influence on technological direction.
*   **True Remote Work:** Fully remote with flexible hours and asynchronous collaboration.
*   **Global Impact:** Build real Industry 4.0 solutions for global manufacturing environments alongside international experts.
*   **Deep Tech Stack:** Work across multiple layers—from factory-floor connectivity to cloud analytics and AI implementations.

Contract:

*   Freelance / Full-time contract.

Time Zone:

*   CET ± 2.

Travel:

*   Are you open to occasional traveling?

Language:

*   High proficiency in English.

Compensation

*   €30-€40 per hour

Solutions Engineer, full-stack (100% Remote)

**Evergreen Role – Talent Pipeline**

This is an evergreen role. We continuously meet talented engineers to support upcoming client projects. While there may not be an immediate opening, qualified candidates may be considered for future engagements.

**With over 20 years of fully remote experience, Lumenalta offers:**

*   Fully remote work
*   Rapid growth opportunities
*   Self-Improvement
*   Industry-leading clients
*   Nurturing engineers’ career paths

**What You Will Work On**

*   Collaborate with visionary enterprise clients
*   Create transformative digital products
*   Learn how to handle difficult situations
*   Tackle complex challenges at scale
*   Push boundaries with emerging technologies

**Requirements**

*   Expertise in React, Node, Express, Mongo, SQL
*   We have a 2-hour assessment
*   High-level English proficiency (written & verbal)
*   Show up as a proactive, team-oriented self-starter on Zoom

**Why Lumenalta?**

*   Work on meaningful, impactful projects.
*   Collaborate with a talented, supportive team
*   Enjoy a flexible, remote-first environment
*   Join a company that values your growth

If you’re a passionate, career-focused developer ready to make a lasting impact, we want to hear from you!

What's it like to work at Lumenalta?

This is a fully remote position open to candidates based in **Europe or regions with compatible time zones**. To ensure effective collaboration with our client and team, candidates must maintain a **6-hour overlap with Eastern U.S. business hours**.

**Application Deadline**

This role is an evergreen position with no predetermined start date. Applications will be accepted until **March 29, 2026**. As we continue to build our talent pipeline, the position may be reposted to allow us to connect with additional qualified professionals.

Javascript Fullstack Engineer - Senior

**About Ovianta**

Ovianta is a Barcelona-based AI startup helping private medical clinics work smarter.

Our platform automates repetitive administrative work such as patient intake, scheduling, and follow-ups through AI voice agents. Clinics save time, reduce missed calls, and improve patient experience.

We raised €540,000 in pre-seed funding from top VCs a year ago and are now scaling our team to accelerate growth across Spain.

If you’re the kind of engineer who loves solving real world problems and wants to see your work make a tangible impact, this is the place for you. At Ovianta, your ideas will not just be heard, they will help shape the future of healthcare. Come code the future of healthcare with us and make an impact that actually matters!

**The Role: Senior Full Stack Engineer with a Product Mindset**

We are looking for a Full Stack Engineer who thinks beyond just writing code. This role is perfect for someone who loves solving real-world problems, has a deep sense of ownership over the product, and thrives on building user-centric solutions. You will not only develop and maintain scalable software but also influence product decisions, shape user experiences, and iterate quickly based on feedback and data.

PostHog’s team (we love them) has perfectly defined what a product engineer is here (https://posthog.com/blog/what-is-a-product-engineer). By the way, we use all of their tools because they are awesome!

**What You’ll Do**

*   **Build & Ship Fast**: Develop, test, and deploy full-stack features with a focus on delivering real value to our users.
*   **Own the Product**: Take responsibility for features from ideation to launch, ensuring they solve real problems for doctors.
*   **Talk to Users**: Collaborate with doctors and medical professionals to understand their pain points and turn insights into impactful solutions.
*   **Drive the Roadmap**: Take ownership of product decisions, working closely with users and leveraging data to shape the direction of Ovianta’s platform.
*   **Keep Things Smooth**: Make sure everything runs fast, stays secure, and scales as we grow.
*   **Experiment Like a Mad Scientist**: Test, tweak, and iterate. We love new ideas, and we are all about trying things out and learning from them.

**Who You Will Work With**

You will be teaming up with Rubén, our tech wizard and former CTO of Playtomic, who has been building and scaling products for 20 years. He has seen it all, from early-stage chaos to full-scale growth, and he is here to help you level up. Then there is Alex, our CEO, who knows the ins and outs of healthcare and pharma like the back of his hand. He makes sure that what we build actually makes a difference where it matters most.

**Who You Are**

*   **Customer-Obsessed**: You care deeply about the end user and enjoy engaging with them to build meaningful solutions.
*   **Pragmatic & Fast-Moving**: You prioritize delivering value over writing the “perfect” code.
*   **Full-Stack Fluent**: You have worked on both front-end and back-end development, ideally using TypeScript (Next.js, Node.js), but we are more interested in your ability to tackle complex projects and solve interesting tech problems. If you have experience with MongoDB or have built APIs before, that is a bonus, but what really matters is your ability to navigate challenging technical landscapes.
*   **Problem Solver**: You enjoy tackling complex technical challenges and finding elegant solutions.
*   **Data-Driven**: You leverage user data and analytics to make informed product decisions.
*   **Self-Starter**: You take initiative, work autonomously, and thrive in a fast-paced startup environment.
*   **Growth-Oriented**: You embrace feedback, continuously improve, and stay up to date with industry trends.
*   **You speak Spanish:** You will be working with our doctors daily. Speaking Spanish is a requirement.

**Tech Stack (Experience in these is a plus, but not required)**

*   **Frontend**: TypeScript, Next.js
*   **Backend**: Node.js
*   **Database**: MongoDB
*   **DevOps**: AWS Serverless, Vercel
*   **AI**: Experience with LLMs or ML models is a bonus

**What We Offer**

*   **Competitive Salary**: 55-60K €. It may not buy you a private island, but it is a solid offer for doing meaningful work that actually makes a difference.
*   **Remote Freedom**: Work from wherever you feel most productive (as long as the Wi-Fi holds up).
*   **Top-Notch Gear**: A brand-new Mac, so you can code without friction.
*   **Equity**: We want you to have skin in the game and grow with us as we scale.

**Why Ovianta?**

*   **Make an Impact**: What you build here will actually help doctors and patients. No pointless features, no busy work, just real problems to solve with real impact.
*   **Own Your Work**: You are not just here to push tickets. From crazy ideas to finished features, you will have the freedom to build, break, and iterate until it works.
*   **Great People, Great Vibes**: Work with a team of smart, passionate people who love tackling big challenges. We move fast, break things in a good way, and always have each other’s backs.
*   **Work from Wherever**: Remote-first means you can work from your couch, a café, or a beach. As long as the Wi-Fi holds up, you are good to go! (You’ll have plenty of opportunities to meet the team)
*   **Enjoy the Ride**: We take our work seriously, but not ourselves. Expect memes, laughs, and a culture where having fun is just as important as shipping great code.

Senior Frontend Developer Freelance

Job Description

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