Lensa is a career site that helps job seekers find great jobs in the US. We are not a staffing firm or agency. Lensa does not hire directly for these jobs, but promotes jobs on LinkedIn on behalf of its direct clients, recruitment ad agencies, and marketing partners. Lensa partners with DirectEmployers to promote this job for TWO95 International. Clicking "Apply Now" or "Read more" on Lensa redirects you to the job board/employer site. Any information collected there is subject to their terms and privacy notice. Title – Sr. Front End Developer (React.js) Position – 6+ Months Contract Location – 100% Remote Work Rate - $Open (Best Possible) Skills: html5 / css3 / js (es6) / json / git / CLI / reactjs / react hooks **Responsibilities**

*   Strong initiative and a collaborative spirit
*   Flexibility & creativity, with the ability to work well on (tight) deadlines
*   A willingness/ability to learn, to be unafraid to ask questions and a desire to advance skills and experience

Note: If interested please send your updated resume and include your rate requirement along with your contact details with a suitable time when we can reach you. If you know of anyone in your sphere of contacts, who would be a perfect match for this job then, we would appreciate if you can forward this posting to them with a copy to us. We look forward to hearing from you at the earliest!. If you have questions about this posting, please contact support@lensa.com

Sr. Front End Developer (React.js) - Remote

Jumpseller is a SaaS solution for small business to manage their online business. We focus on making e-commerce easier for everyone, so businesses can focus on what they do best: building and selling their products. Today, merchants use the Jumpseller platform to manage every aspect of their online business — from products to orders to customers, selling with an online store, on mobile, on social networks and through different e-commerce channels.

At Jumpseller you will find a startup environment in which your contributions matter and you are enabled to grow professionally. We have 2 offices, one in Porto, Portugal, and another in Santiago, Chile, and our working culture is international. We all work fully remote.

We are looking for a Full Stack Developer to join our growing team. We look for skilled & dedicated people who share our passion for building a product that millions of people use.

You Are

*   A bachelor/master in Informatics (or related);
*   Proven professional experience in OO programming and web development;
*   Attentive to details, delivering quality code which is maintainable, efficient and reliable;
*   Experienced in MySQL, or other relational databases;
*   Familiar with automated testing tools;
*   Used to work in JSON/XML/CSV formats and have no issues with HTML/CSS;
*   Use AI coding tools (e.g. GitHub Copilot, ChatGPT, Claude, etc.) to enhance productivity and code quality.
*   Experienced in Ruby or Ruby and Rails (the right candidate will be considered without this experience);
*   Experience in React / React Native:
*   Good in English communication and teamwork.

You Will

*   Work in an informal environment, for a global market;
*   Strive to write clean, modular, flawless and scalable code responsible to handle millions of records;
*   Design new features from ground-up, from a given set of specs;
*   Build automated tests for your code while help improving and maintaining our current test set;
*   Be in contact with our Customer Support Team, resolving technical issues and understand how to improve our service;
*   Take responsibility, autonomy and ownership of your work.

Full-stack Developer

**_ASTEK_** to międzynarodowa firma o francuskich korzeniach, która istnieje od ponad 30 lat. **_Astek Group_** jest globalnym graczem w obszarze konsultingu usług IT obecnym na 5 kontynentach. W Polsce na naszym pokładzie jest obecnie 1700 konsultantów o profilach głównie IT i non-IT. To co nas wyróżnia to duża ilość projektów informatycznych z wielu branż takich jak: bankowość, telekomunikacja, ubezpieczenia, pharma, finance, hi-tech.

Aktualnie poszukujemy osoby na stanowisko Frontend Developera (Angular)

**_Lokalizacja:_**

Praca zdalna (otwartość na wizytę raz w miesiącu we Wrocławiu lub Poznaniu)

**Stawka:**

Umowa o pracę: **do 18 000 zł brutto**

B2B: **do 1 250 zł netto + VAT/MDTwoje codzienne zadania:**

*   Rozwój frontendu aplikacji (Angular) obsługującej Fundusze Inwestycyjne dla segmentu SME
*   Współpraca z Engineering Managerem, zespołami IT i biznesowymi oraz zewnętrznymi dostawcami
*   Udział w projektowaniu oraz dokumentowaniu rozwiązań technologicznych
*   Kooperacja z istniejącymi zespołami developerskimi odpowiedzialnymi za rozwój systemu (ponad 20 osób – analitycy, developerzy, testerzy)

**Czego oczekujemy od Ciebie?**

*   Minimum 5 lat doświadczenia jako Frontend Developer
*   Bardzo dobra znajomość **Angular** i **JavaScript**
*   Umiejętność pracy w środowisku projektowym, interdyscyplinarnym zespole i dynamicznych warunkach
*   Gotowość do okazjonalnych spotkań onsite (1x we Wrocławiu lub Poznaniu)
*   Dostępność ASAP

**Co Ci oferujemy?**

*   Atrakcyjny i przejrzysty system płatności
*   Stabilne zatrudnienie w oparciu o umowę o pracę
*   Szkolenia
*   Możliwość rozwoju zawodowego w międzynarodowym środowisku - naszymi klientami są znane polskie i światowe marki
*   Wymiana wiedzy i doświadczeń z innymi współpracownikami
*   Budowanie sieci zawodowych i nawiązywanie kontaktów
*   Tworzenie Centrów Kompetencyjnych do gromadzenia wiedzy
*   Organizacja wydarzeń wewnętrznych i zewnętrznych dla doskonalenia umiejętności
*   Dostęp do nowych możliwości rozwoju zawodowego
*   Wsparcie ze strony Managerów Centrów Kompetencyjnych i Zasobów
*   Uczestnictwo w prestiżowych szkoleniach prowadzonych przez Ekspertów
*   Analiza trendów technologicznych i tworzenie podgrup kompetencyjnych

_Dołączając do Nas stajesz się częścią Centrum Kompetencyjnego poświęconego Twojej ekspertyzie!_

Zapraszam serdecznie do kontaktu: jakub.chadzynski@astek.net

_🙋 To nie o Tobie? Poleć nam znajomego i zgarnij bonus do 7000 zł!_

Frontend Developer (Angular)

🚀 Join the Future of Commerce with Whatnot! Whatnot is the largest livestream shopping platform in North America and Europe to buy, sell, and discover the things you love. We’re re-defining e-commerce by blending community, shopping, and entertainment into a community just for you. As a remote co-located team, we’re inspired by innovation and anchored in our values. With hubs in the US, UK, Ireland, Poland, and Germany, we’re building the future of online marketplaces—together. From fashion, beauty, and electronics to rare collectibles like trading cards, comic books, and even live plants, our live auctions have something for everyone. And we’re just getting started! As one of the fastest growing marketplaces, we’re looking for bold, forward-thinking problem solvers across all functional areas. Check out the latest Whatnot updates on our news and engineering blogs and join us as we enable anyone to turn their passion into a business, and bring people together through commerce. **💻 **Role The Payments team at Whatnot is fundamental to the product’s global operations. We power every order, collect every payment across a wide range of local and international methods, and manage returns, refunds, and seller payouts at scale. Each year, we process billions of dollars in payments, making us one of the most trusted and essential systems in the business. As Whatnot grows rapidly, our team is directly responsible for enabling that growth—by building reliable, scalable infrastructure and developing innovative ways for users to transact. We play a central role in shaping the future of commerce on the platform and are accountable for supporting the continued expansion of both buyers and sellers in the years ahead. Each member of the team has a lot of individual responsibility and many more freedoms, so we need to hire people we can trust. Your ability to make good trade-offs and exercise good judgment is essential to us. As a iOS (Fullstack) Engineer on the Payments team, you’ll own and deliver end-to-end experiences across everything Payments touches — including adding and managing payment methods, completing purchases, and enabling seller cashouts. You’ll build seamless, high-trust flows on iOS, while also contributing to the backend systems that power them. This is a true fullstack role: while your primary focus will be iOS, we expect you to dive into backend code when needed — whether to implement APIs, debug distributed systems, or ensure a clean integration between frontend and backend. You’ll collaborate closely with product, design, and other engineers to ship polished, reliable, and high-impact features that make it easier for people to transact on Whatnot. Team members in this role are required to be within commuting distance of our Dublin, Ireland hub. 👋 You Curious about who thrives at Whatnot? We’ve found that embodying a low ego, growth mindset, and high-impact drive goes a long way here. As Our Next IOS (Fullstack) Engineer, You Should Have 3-5 Or More Years Of Software Development Experience Building Scalable Systems That Can Handle Millions Of Users, Plus

*   You are comfortable working across the stack, with deep expertise in iOS development, and a willingness to contribute to backend code when needed
*   Excellent product instincts. You first think about users rather than the best technical solution
*   You can mentor others, and prioritize building inclusive, supportive teams
*   Project owner - you have strong ownership instincts and can own projects from inception to production, and beyond
*   You are known for shipping products and features lightning-fast
*   You are an excellent problem solver and don’t need to be told exactly what to do
*   You are open to doing frontend work when required
*   Ability to pick up on new technologies very quickly
*   Proven track record of delivering features
*   Experience with payment systems, infrastructure, experiences and international commerce (nice to have)
*   Startup experience at a high-growth company (nice to have)

🎁 Benefits

*   Flexible Time off Policy and Company-wide Holidays (including a spring and winter break)
*   Health Insurance options including Medical, Dental, Vision
*   Work From Home Support

*   Home office setup allowance
*   Monthly allowance for cell phone and internet

*   Care benefits

*   Monthly allowance for wellness
*   Annual allowance towards Childcare
*   Lifetime benefit for family planning, such as adoption or fertility expenses

*   Pension plan
*   Monthly allowance to dogfood the app

*   All Whatnauts are expected to develop a deep understanding of our product. We're passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!).

*   Parental Leave

*   16 weeks of paid parental leave + one month gradual return to work \*company leave allowances run concurrently with country leave requirements which take precedence.

💛 EOE Whatnot is proud to be an Equal Opportunity Employer. We value diversity, and we do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, parental status, disability status, or any other status protected by local law. We believe that our work is better and our company culture is improved when we encourage, support, and respect the different skills and experiences represented within our workforce.

iOS (Fullstack) Engineer, Payments

*   Work Type: Contractor | Permanent Remote
*   Compensation: USD 50 – 125/hour
*   Hours: 10 to 40 hours/week (Partial PST overlap required)
*   Experience Required: 10 – 25 Years
*   Contract Duration: 1 Month (Extension based on performance)
*   Notice Period: Immediate preferred

**Note**

*   This is a contract-based, fully remote opportunity.
*   Contractors must be citizens or valid work permit holders in the US, Canada, Australia, or approved Western European countries.
*   No medical benefits or paid leave.
*   The contractor is responsible for managing their own taxes and compliance.
*   Payments are made based on actual hours worked.

**Job Overview**

*   We're looking for highly experienced Fullstack Engineers to work on frontier AI projects, especially around improving Large Language Models (LLMs) for software engineering tasks. You'll support the development of LLM training and evaluation datasets by assessing code generated by models, building agent-based tools, and analyzing complex real-world software.
*   You’ll work with teams pushing the boundary of AI-assisted development to identify weaknesses in model behavior and provide detailed code assessments. The goal is to build smarter, more context-aware AI coding tools that function in realistic development environments.

**Key Responsibilities**

*   Work across multiple LLM-related projects aimed at improving AI model performance on code.
*   Lead end-to-end engineering efforts for agent use cases like home automation, coding copilots, and creative assistants.
*   Review and rank model-generated code snippets using a structured evaluation system.
*   Evaluate code diffs for correctness, style, maintainability, and performance.
*   Build scalable fullstack applications to support dataset pipelines and tooling.
*   Collaborate with researchers to uncover edge cases and complex code behaviors.
*   Write clear, structured rationales to explain code assessment outcomes.

**Must-Have Skills**

*   10+ years of experience in software engineering with strong fullstack capabilities.
*   At least 2–3 years as a full-time employee (not contractor) at a top-tier tech company (e.g., Google, Meta, Microsoft, Amazon, Stripe, etc.).
*   Deep expertise in software architecture, debugging, and code review.
*   Proven ability to assess large, realistic codebases and evaluate code quality.
*   Strong written and oral communication for clear and logical evaluations.
*   Hands-on experience with Git, code versioning, modern frameworks, and cloud platforms.

Senior Fullstack Engineer – AI & LLM Code Evaluation [1 Month Contract]

**Work Type: Contractor | Permanent Remote Compensation: USD 50 – 125/hour Hours: 10 to 40 hours/week (Partial PST overlap required) Experience Required: 5 – 10 Years Contract Duration: 1 Month (Extension based on performance) Notice Period: Immediate preferredNote**

*   This is a contract-based, fully remote role.
*   Only citizens or valid work permit holders from the US, Canada, Australia, or Western Europe are eligible.
*   No medical benefits or paid leave.
*   Contractors must manage their own taxes and compliance.
*   Payment is based on actual hours worked.

**Job OverviewWe're seeking skilled Fullstack Engineers to join cutting-edge AI projects focused on enhancing the performance of Large Language Models (LLMs) in real-world software tasks. Your work will help train, test, and validate LLMs by evaluating AI-generated code, contributing to agent-based applications, and collaborating with a high-performance team of engineers and researchers.You will play a key role in building datasets, testing model responses, and pushing AI systems closer to real developer productivity.Key Responsibilities**

*   Contribute to LLM-focused projects that evaluate AI performance on realistic software engineering tasks
*   Build and lead agent use cases such as coding copilots, creative tools, or automation bots
*   Review and rank 3–4 AI-generated code solutions per task using a structured framework
*   Analyze code diffs for accuracy, efficiency, and readability
*   Construct fullstack tools for data pipeline support and internal testing environments
*   Identify and report edge cases in model outputs, providing well-structured rationale
*   Work closely with researchers and engineers to improve model behavior and code quality

**Must-Have Skills**

*   5+ years of hands-on software engineering experience, including strong fullstack development
*   1+ years full-time (FTE only) at a top 50 tech company if US-based, 2+ years if located outside the US
*   Deep knowledge of software design, code review, debugging, and scalable systems
*   Proven expertise in building production-grade applications using modern frameworks
*   Excellent communication skills for writing clear evaluation rationales
*   Proficient in Git workflows, JavaScript/Python, and cloud platforms (AWS, GCP, etc.)

Fullstack Developer – AI Copilot & Code Quality [1 Month Contract]

ALGOTEQUE is an IT consultancy firm that helps startups, mid-sized and large corporations to create and deliver innovative technologies. Our team has a successful track record in designing, developing, implementing, and integrating software solutions (AI, ML, BI, Web, Automation) for Telecom, Energy, Bank, Insurance, Pharma, Automotive, Industry, e-commerce. We deliver our services both in fixed-price and time-and-materials models, helping our customers achieve their business and IT strategies. **Job Description** Industry: EdTech We are currently seeking a skilled Fullstack Developer with strong experience in Java and React to join an innovative EdTech project for one of our key clients. This is a unique opportunity to work on a meaningful product that is reshaping digital education experiences for children and educators. **What You'll Do**

*   Design, develop, and maintain scalable web applications using Java and React,
*   Collaborate with cross-functional teams including designers, QA, and DevOps,
*   Participate in code reviews and contribute to architectural decisions,
*   Ensure high code quality and performance through testing and optimization,
*   Stay up-to-date with emerging technologies and propose their adoption when relevant.

**Profile / Requirements**

*   Expertise in Java (Spring Boot) for backend development is essential,
*   Working knowledge of frontend technologies (React.js, HTML, CSS, TypeScript),
*   Experience with RESTful APIs and microservices architecture,
*   Familiarity with CI/CD pipelines and cloud services (AWS or Azure is a plus),
*   Strong communication skills and the ability to work independently in a remote environment,
*   Good command of English (B2/C1) and Polish ( C2).

If you're ready to join a team that values quality, creativity and purpose, we'd love to hear from you! Apply now and help us build the future of education. **Benefits**

*   Long-term B2B contract,
*   100 % remote job,
*   The opportunity to work on an impactful product in the education sector,
*   A flexible and supportive working environment.

Senior Fullstack Developer (Java&React)

Hi! We are **Monterail** - a team of over **130+** experts working together to create meaningful software. **Discover your way at Monterail.** We are looking for a **Senior React Developer** to join our team and help us create innovative software as a freelancer. **You are - ideally:**

*   Strong experience with React
*   Proficiency in modern JavaScript (ES6+)
*   Solid experience with state management solutions, particularly Redux and React Context
*   Experience consuming RESTful APIs
*   Proficiency in SCSS for styling; familiarity or a keen interest in Tailwind CSS is highly desirable
*   English skill
*   Availability for full-time cooperation (B2B contract only)

**What do we mean by freelance?**

*   Read more at Monterail Tech Network

**Salary** 90 - 110 PLN/h + VAT (B2B contract only)

Senior React Developer - Freelancer

**React Developer (2-miesięczny kontrakt)**

• **Forma zatrudnienia:** kontrakt B2B (do 150 zł/h)

• **Zaangażowanie:** full-time

**• Kontrakt na 2 miesiące** (na ten moment bez szans na przedłużenie)

• **Praca zdalna** (z terenu Polski)

**Wymagane umiejętności:**

• 4+ lat doświadczenia w pracy z **React**.

• Dobra znajomość Node.js i TypeScript oraz CSS (doświadczenie z Emotion.js będzie dodatkowym atutem).

• Swobodne posługiwanie się technikami refaktoryzacji.

• Doświadczenie w pracy z dużymi aplikacjami webowymi.

• Znajomość accessibility WCAG 2.2.

• Biegła znajomość języka angielskiego w mowie i piśmie.

React Developer (2-miesięczny kontrakt)

About c/side: c/side is laser focused on solving web security, starting with browser side injections. Covering previously unmonitored attack surfaces in developer and user friendly ways. The team of c/side are a diverse mix of highly capable subject matter experts. We’re kind but we mean business. Since January 2024, c/side has raised $7.7 million in pre-seed funding from Uncork Capital, Mantis Ventures, Scribble Ventures, Roar VC, Dan Scheinman, Jason Warner, Kathy Korevec and many more. A team of handpicked, high value add investors invested in helping our company and team grow. About the role: We are looking for a highly skilled full-stack engineer to focus on the core of c/side. This includes but is not limited to the dashboard, API, landing pages, and other microservices that tie in the user experience. At c/side we utilize a healthy split of bleeding edge technologies and technologies that have been battle-tested. You will closely work with other engineers and our designer to create new pages and features, iterate upon your work from customer feedback, and build the best product you possibly can. What you will do:

*   Scope projects together with product, design and back-end team and drive them to a successful conclusion.
*   Build features end-to-end from the API to the frontend.
*   Write clean and concise documentation.
*   Build and improve applications using React/NextJS, TailwindCSS, Clickhouse, and GraphQL with Relay.
*   Ability to mentor and support team members, fostering a collaborative and learning-oriented environment.

About you:

*   You love TypeScript, creating extensive types that make the developer experience easier.
*   Have a lot of energy and are eager to work in a dynamic startup environment, working hard to build world changing technology, going from 0 to 1.
*   Proven experience in monitoring, alerting and debugging high volume production systems.
*   Solid understanding of a public cloud platform like AWS.
*   Have deep experience in GraphQL and React Relay.
*   You excel in fast-paced environments, managing multiple priorities and adapting quickly to new challenges.
*   You have a few years of experience and/or a lot of energy and ability to get things done. This is a fast paced role in a fast paced environment.
*   Experience with browser environments and client-side security is a significant plus.
*   Experience in Clickhouse is a significant plus, but must be willing to learn.

At c/side:

*   Constantly learning and developing better, we grow together
*   We do not ship half projects, we do not sell snake oil, we don’t cut corners - out of respect for our team, our customers and our community, we put a dent in the universe by building good products
*   Transparency and integrity above all

c/side offers:

*   Quarterly offsite
*   Generous work from home allowance
*   Latest Macbook
*   Stock options
*   Market rate salary
*   Take what you need PTO
*   Fully remote
*   Our team is invested in your long term career development. If you want to talk at events, we’ll make that happen, if you want to learn how to build your own startup one day, we’ll offer you a front line seat. c/side is built by folks like you.

We’re building a world class security company, and we simply want the best people for the job. We do not select or discriminate based on formal educational background, age, skin tone, religion, national origin, sexual orientation, gender identity, disability status, marital status, veteran status… we’re welcoming all and celebrate equal opportunities.

Senior full-stack engineer

**About our clientheyLibby** is a seed-stage startup on a mission to give every small-to-midsize fitness and wellness business a world-class AI team member. It was co-founded by Spencer Rascoff, the former CEO of Zillow and current CEO of Match Group. Its AI works seamlessly across phone, email, text, and chat to help businesses manage their communications efficiently. The team moves fast, prioritizes impact, and works closely with top industry experts. They ship fast, learn fast, and measure themselves by the tangible impact delivered to customers.

**About the role**

The company is looking for a highly skilled and experienced **Senior Software Engineer** with the ability to architect, design, and build and with expertise in Node.js, TypeScript, and AWS. This person will be a critical part of the small, high-impact team, architecting and building scalable systems while making quick and pragmatic decisions. They value engineers who can think creatively, ship fast, and build practical solutions that drive real business value. The team also uses AI throughout all daily tasks and is looking for engineers who can use the latest AI technologies to accelerate development.

Why this role matters

The company is looking for a senior engineer to join the small but mighty team and own core pieces of the product stack. This is a high-impact role where the person will shape how backend and frontend systems evolve to support a rapidly growing customer base.

They will help scale Node.js services, and drive architectural decisions across the board. They will also use AI tools to accelerate development and optimize delivery—everything from code generation to testing and beyond.

**What You’ll Do**

*   Build Core Features End-to-End
*   Design and deliver user-facing and backend functionality, from conception to production release.
*   Scale Backend Services
*   Develop robust APIs and backend logic using Node.js on AWS, with a focus on performance and reliability.
*   Shape System Architecture
*   Select design patterns, lead technical decisions, and implement scalable, maintainable systems.
*   Apply AI in Development Workflows
*   Use the latest LLM tools and frameworks to enhance development velocity and code quality.
*   Own the Frontend Experience
*   Take charge of the frontend, using React + TypeScript or tools like lovable.ai to ship smooth, responsive interfaces that customers love.
*   Collaborate Cross-Functionally
*   Work closely with founders, engineers, and AI specialists to iterate quickly and align on product direction.

**What They’re Looking ForMust-Have Experience**

*   5+ years of full-stack development experience
*   Deep expertise in Node.js and TypeScript; React experience is a plus
*   Experience with AWS services and cloud-native infrastructure
*   Strong architectural instincts; confident designing scalable, maintainable systems
*   Ability to leverage AI tools for coding, testing, and optimization
*   Comfort with fast-paced environments and shipping iteratively
*   Strong communication and a team-first mindset
*   A ‘get-it-done’ attitude and a bias toward execution over perfection

**Bonus Points**

*   Experience with AWS Amplify
*   Prior startup or small team experience
*   Familiarity with automated testing and CI/CD pipelines
*   Exposure to identity frameworks (OIDC, OAuth, etc.)
*   Experience with IAM and access control strategies

**How They Work & What the Role Offers**

*   Competitive Comp – **$175,000 to $200,000 + meaningful equity**
*   Health Coverage – Full medical, dental, and vision benefits are offered
*   Discretionary Time Off – Trust is placed in the individual to balance work and rest
*   Workspace Setup Support – Gear needed to be productive is covered
*   Autonomy & Ownership – The engineer is trusted to drive decisions
*   Velocity – Weekly releases, minimal ceremony, rapid experimentation
*   Impact – Code will be on the critical path for every customer interaction
*   Flexible, People-First Culture – The team works hard but protects family and personal time

Ready to build AI that works like magic and ships cool new features frequently? Apply now and help redefine how small businesses connect with their customers.

Sr. Front End Developer (React.js) - Remote

Job Description

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Lensa

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