Associate Frontend Team Lead (React)

🏢 Summary: Frontend Team Lead role focused on leading the development of scalable, high-performance React applications in a hybrid work model. The position combines hands-on architecture and implementation with mentoring a frontend team and enforcing best practices in design patterns, testing, and CI/CD. The role requires strong expertise in modern React ecosystem and state management to drive frontend excellence. 🗂️ Requirements: 5+ years experience with JavaScript or TypeScript, 3+ years commercial experience with React.js, Strong knowledge of React Hooks and Context API, Strong experience with Redux and Redux Toolkit, Experience with frontend design patterns and clean code principles, Experience integrating REST or GraphQL APIs, Strong knowledge of HTML5 and CSS3 or SCSS, Experience with component libraries and design systems, Familiarity with Webpack or Vite build tools, Experience with unit and integration testing, Experience leading or mentoring frontend developers 📃 Skills: JavaScript, TypeScript, React, Hooks, ContextAPI, Redux, ReduxToolkit, HTML5, CSS3, SCSS, REST, GraphQL, Webpack, Vite, Jest, ReactTestingLibrary, Storybook, MaterialUI, Tailwind, Next.js, Lighthouse, ChromeDevTools, WCAG, CICD 🏢 Description: Frontend Team Lead (React) 📍 Warsaw Poland, Hybrid remote with 3 days from office 💼 Contract of Employment / Umowa o pracę 💰 Monthly compensation up to 8,000 USD About the Client Our Client is a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. Their integrated ecosystem includes PaaS - Platform as a Service, the Core Platform, an AI-native enterprise operations foundation built to optimize workflows, surface insights, and accelerate value creation across portfolios; SaaS - Software as a Service, a cloud platform delivering unmatched performance, intelligence, and execution at scale; and S&C - Solutions and Consulting Suite, modular technology playbooks designed to manage, grow, and optimize company performance. With over a decade of experience supporting high-growth companies and private equity-backed platforms, brings deep domain expertise and a proven ability to turn technology into a strategic advantage. The Role We are looking for an experienced and passionate React Team Lead to lead the development of modern, scalable web applications. You will guide a team of React developers, enforce best practices in frontend architecture and design patterns, and ensure delivery of high-performance user interfaces. The ideal candidate has strong expertise in React (including Hooks and Context API), Redux, and frontend design patterns, and thrives in a fast-paced, collaborative environment. Key Responsibilities Lead, mentor, and support a team of React developers through code reviews, 1:1s, and hands-on coaching. Collaborate with product managers, designers, and backend engineers to define and prioritize features. Own and manage sprint planning, task estimation, and delivery timelines for the frontend team. Architect and implement complex user interfaces using React, Hooks, and Context API. Maintain and evolve a scalable state management solution using Redux Toolkit. Enforce modern frontend design patterns (such as container/presenter, compound components, render props, and HOCs). Build reusable component libraries and maintain design system alignment. Optimize application performance, accessibility, and cross-browser compatibility. Drive best practices in code quality, testing, CI/CD, and documentation. Maintain high unit and integration test coverage (e.g., using Jest, React Testing Library). Contribute to frontend architecture decisions and evaluate new tools/libraries as needed. Requirements 5+ years of experience in JavaScript/TypeScript with 3+ years in React.js Strong expertise with React Hooks, Context API, and Redux (Redux Toolkit preferred) Proven experience with frontend design patterns and clean code principles Experience integrating with RESTful APIs or GraphQL Solid understanding of HTML5, CSS3/SCSS, and responsive UI design Experience with component libraries and design systems (e.g., Storybook, Material UI, Tailwind) Familiarity with build tools like Webpack, Vite, and bundler optimizations Experience leading or mentoring engineers in a team setting Nice to Have Familiarity with performance profiling tools (e.g., Lighthouse, Chrome DevTools) Experience with SSR/SSG frameworks like Next.js Knowledge of accessibility standards (WCAG) Contributions to open-source frontend libraries What’s Offered Monthly compensation up to 8,000 USD Opportunity to lead a specialized frontend team in a fast-growing tech company Real influence on frontend architecture and design patterns

🏢 Summary: Full-time Team Lead Software Engineer role focused on leading a full-stack team building high-performance web applications using React and Node.js. The position combines hands-on development with architectural ownership, mentoring, and delivery of scalable, AI-powered enterprise platforms. Work involves designing microservices, APIs, and cloud-based containerized deployments in a hybrid setup from Warsaw. 🗂️ Requirements: 7+ years full-stack experience with React.js and Node.js in production, 2+ years in Team Lead or senior engineering leadership role, Strong knowledge of React ecosystem (Redux, Hooks, component architecture, performance optimization), Proficiency in HTML5, CSS3, JavaScript ES6+, Experience with build tools (Webpack, Vite, or Babel), Experience with Express.js and RESTful API design, Knowledge of OAuth, JWT, session-based authentication, Experience with PostgreSQL or MySQL, Experience with MongoDB or other NoSQL databases, Hands-on experience with Docker, Familiarity with AWS or other major cloud platform, Experience with Git and Agile/Scrum methodologies 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, REST, GraphQL, OAuth, JWT, PostgreSQL, MySQL, MongoDB, Docker, Kubernetes, AWS, Git, Webpack, Vite, Babel, Agile, Scrum 🏢 Description: 💰 Salary: 29,500–33,200 PLN/month 🌎 Hybrid from Warsaw, Poland 🕦 Full-time position, long-term ☑️ Contract of Employment We are looking for a Team Lead Software Engineer to join our client, a technology company that builds AI-powered platforms and consulting solutions for enterprise operations, with a strong focus on the private capital sector. The company has over ten years of experience working with high-growth and PE-backed businesses, combining deep domain expertise with advanced technology to drive measurable results. In this role, the focus will be on leading a team of developers across front-end and back-end development, owning architectural decisions, and contributing directly to the codebase. You will mentor engineers and drive the delivery of high-performance web applications using React and Node.js. Requirements 7+ years of full-stack development experience with React.js and Node.js in production environments 2+ years in a team lead, tech lead, or senior engineering leadership role Strong command of the React ecosystem: Redux, React Hooks, component architecture, and performance optimization Solid HTML5, CSS3, and modern JavaScript (ES6+); experience with build tooling such as Webpack, Vite, or Babel Proficiency with Express.js and API design (RESTful; GraphQL is a plus) Working knowledge of auth patterns: OAuth, JWT, session-based authentication Hands-on experience with PostgreSQL or MySQL; familiarity with MongoDB or similar NoSQL databases Docker experience required; Kubernetes is a plus Familiarity with at least one major cloud platform (AWS preferred) Comfortable with Git workflows and Agile/Scrum delivery Responsibilities Lead and mentor a team of software engineers; run code reviews, set engineering standards, and hold the bar on quality Architect and build full-stack features using React.js (with Redux and Hooks) on the front end and Node.js / Express.js on the back end Design scalable microservices and RESTful (or GraphQL) APIs aligned with product requirements Own the testing strategy: define coverage expectations, enforce unit and integration testing, and integrate quality gates into CI/CD pipelines Manage containerized deployments via Docker; collaborate on infrastructure with cloud platforms (AWS, Azure, or GCP) Partner directly with Product and Design to translate requirements into production-grade, accessible interfaces Model and maintain SQL and NoSQL data schemas; own data interaction patterns across services Monitor production systems, triage incidents, and drive root-cause resolution Keep technical documentation accurate and up to date Get to know DevsData We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team. We employ people with experience in international corporations as well as the ones from the best technical and business universities. Find out more: https://devsdata.com

🏢 Summary: Hybrid React Team Lead role focused on leading the development of scalable web applications and managing a frontend team in a dynamic, product-oriented environment. The position combines hands-on React development with architectural decisions, state management design, and close collaboration with cross-functional teams. It requires strong expertise in modern frontend technologies, testing practices, and performance optimization. 🗂️ Requirements: 5+ years experience with JavaScript/TypeScript, 3+ years experience with React.js, Strong knowledge of React Hooks, Strong knowledge of Context API, Strong knowledge of Redux (Redux Toolkit preferred), Experience with frontend design patterns, Experience with clean code principles, Experience with RESTful APIs or GraphQL, Good knowledge of HTML5, Good knowledge of CSS3/SCSS, Experience with responsive design, Experience with component libraries and design systems, Familiarity with Webpack or Vite, Experience leading or mentoring developers 📃 Skills: JavaScript, TypeScript, React, Redux, ReduxToolkit, Hooks, ContextAPI, HTML5, CSS3, SCSS, REST, GraphQL, Webpack, Vite, Jest, ReactTestingLibrary, Storybook, MaterialUI, Tailwind, Next.js, Lighthouse, ChromeDevTools, WCAG 🏢 Description: Please note: This is a hybrid role – 3 days per week from the office in Warsaw. Overview We are a leader in AI-powered enterprise operations. We deliver digital solutions and consulting services that help companies grow and improve their performance. We use advanced technology to simplify processes, increase efficiency, and create new business opportunities, especially in private capital markets. Our ecosystem includes: PaaS (Platform as a Service) – an AI-based platform that improves workflows, provides useful insights, and supports value creation across portfolios. SaaS (Software as a Service) – a cloud platform that offers strong performance, smart tools, and scalable solutions. S&C (Solutions and Consulting Suite) – modular technology solutions that help manage, grow, and improve company performance. With more than 10 years of experience working with fast-growing companies and private equity-backed businesses, we combine strong industry knowledge with technology expertise to create real business value. The Opportunity We are looking for an experienced and motivated React Team Lead to lead the development of modern and scalable web applications. You will manage a team of React developers, support good frontend architecture practices, and make sure we deliver fast and high-quality user interfaces. The ideal candidate has strong experience with React (including Hooks and Context API), Redux, and frontend design patterns. You should feel comfortable working in a dynamic and team-oriented environment. Responsibilities Lead, mentor, and support a team of React developers through code reviews, 1:1 meetings, and practical guidance. Work closely with product managers, designers, and backend engineers to plan and prioritize features. Manage sprint planning, task estimation, and delivery timelines for the frontend team. Design and build complex user interfaces using React, Hooks, and Context API. Develop and maintain scalable state management solutions using Redux Toolkit. Apply modern frontend design patterns (such as container/presenter, compound components, render props, and HOCs). Build reusable component libraries and ensure alignment with the design system. Improve application performance, accessibility, and cross-browser compatibility. Promote best practices in code quality, testing, CI/CD, and documentation. Maintain strong unit and integration test coverage (e.g., with Jest and React Testing Library). Support frontend architecture decisions and evaluate new tools when needed. Requirements 5+ years of experience with JavaScript/TypeScript, including 3+ years with React.js Strong knowledge of React Hooks, Context API, and Redux (Redux Toolkit preferred) Experience with frontend design patterns and clean code principles Experience working with RESTful APIs or GraphQL Good knowledge of HTML5, CSS3/SCSS, and responsive design Experience with component libraries and design systems (e.g., Storybook, Material UI, Tailwind) Familiarity with build tools such as Webpack or Vite Experience leading or mentoring developers Nice to Have Experience with performance tools (e.g., Lighthouse, Chrome DevTools) Experience with SSR/SSG frameworks like Next.js Knowledge of accessibility standards (WCAG) Contributions to open-source frontend projects Why Join Us? We are looking for creative people who solve problems, learn quickly, and enjoy working in an open and diverse environment. We work hard, support each other, and also make time to enjoy what we do.

🏢 Summary: Hybrid Team Lead FullStack role focused on building and scaling high-performance web applications using React and Node.js, while leading a development team. The position combines hands-on front-end and back-end development with architectural design, API development, and cloud-based deployments. You will drive technical excellence across the full software development lifecycle in an international R&D environment. 🗂️ Requirements: 7+ years full-stack development experience with React and Node.js, 2+ years experience in team leadership or senior developer role, Expertise in React.js, Redux, React Hooks, Strong knowledge of HTML5, CSS3, JavaScript (ES6+), Proficiency in Node.js and Express.js, Experience designing RESTful APIs or GraphQL APIs, Knowledge of OAuth, JWT or session-based authentication, Experience with PostgreSQL or MySQL, Experience with AWS, Azure or GCP, Experience with Docker and CI/CD pipelines 📃 Skills: React, Redux, JavaScript, HTML5, CSS3, Node.js, Express, GraphQL, REST, OAuth, JWT, PostgreSQL, MySQL, AWS, Azure, GCP, Docker, Kubernetes, CI/CD, Webpack, Babel, Vite 🏢 Description: Team Lead FullStack (Node.js, React) IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They are a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. With over a decade of experience supporting high-growth companies, they bring deep domain expertise and a proven ability to turn technology into a strategic advantage. Role Overview We are seeking a highly skilled Full Stack Team Lead with expertise in React and Node.js to lead our dynamic team. The ideal candidate will have over 7 years of experience in designing and building high-performance web applications, along with demonstrated leadership experience. You will lead a team of developers, working on both front-end and back-end development, contributing to every stage of the software development lifecycle, and mentoring junior team members. Key Responsibilities Team Leadership & Mentorship: Lead and mentor a team of software engineers, fostering a collaborative and high-performance environment. Provide technical guidance, conduct code reviews, and support professional development. Front-End Development: Build and maintain interactive and responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+). Back-End Development: Develop robust, scalable server-side applications and RESTful APIs using Node.js and Express. Application Architecture & Integration: Design and implement scalable architectures and microservices that meet business needs, ensuring best practices are followed across the team. Collaborate with database engineers to design efficient database schemas and manage data interactions using MongoDB or SQL databases. Deployment & Testing: Manage deployments and ensure seamless delivery of updates using CI/CD pipelines and containerization tools like Docker. Ensure high-quality code by writing unit and integration tests, performing debugging, and optimizing application performance. Collaboration & Documentation: Work closely with designers, product managers, and other developers to deliver innovative and user-centric solutions. Create and maintain technical documentation for applications, APIs, and architectural decisions, ensuring team adherence to documentation standards. Requirements & Qualifications Experience & Education: 7+ years of professional experience in full-stack development with React and Node.js. 2+ years of experience in a team lead or senior leadership role, guiding and mentoring other developers. A Bachelor's degree in Computer Science or equivalent is preferred. Front-End Stack: Expertise in React.js, Redux, React Hooks, and component-based architecture. Strong knowledge of HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with front-end tools like Webpack, Babel, or Vite. Back-End Stack: Proficiency in Node.js and Express.js for building server-side applications. Experience with API design and integration, including GraphQL (preferred) or RESTful services. Knowledge of authentication mechanisms such as OAuth, JWT, and session-based authentication. Database & DevOps: Hands-on experience with databases such as PostgreSQL or MySQL. Experience with cloud platforms such as AWS, Azure, or GCP. Familiarity with containerization tools like Docker and orchestration tools like Kubernetes is a plus. Soft Skills: Strong problem-solving and analytical skills. Excellent communication and collaboration abilities, with a proven ability to lead and motivate a team. Eagerness to stay updated on emerging technologies and trends, and to drive continuous improvement within the team. What Is Offered Compensation: Monthly compensation up to 9,000 USD gross . Contract Type: Employment Contract (Umowa o Pracę) ONLY . Please note that there is strictly no B2B option available for this position. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization. Culture: We value creative problem solvers who learn fast, work well in an open and diverse environment, and enjoy pushing the bar for success ever higher. We do work hard, but we also choose to have fun while doing it.

🏢 Summary: Senior Frontend Developer role focused on building and maintaining complex cloud-based web applications for network configuration, monitoring, and optimization. The position involves developing new features, maintaining a custom UI component library, and contributing to code and UX reviews within a global team. Hybrid work model with long-term B2B cooperation. 🗂️ Requirements: 5+ years experience building complex web applications, Strong knowledge of JavaScript, Strong knowledge of TypeScript, Strong knowledge of HTML5, Strong knowledge of CSS3, Experience with React, Experience with Redux, Experience with Redux Toolkit, Experience writing well-tested maintainable code, Experience with REST API integration, Proficient English communication skills 📃 Skills: JavaScript, TypeScript, HTML5, CSS3, React, Redux, ReduxToolkit, REST, Cypress, ReactTestingLibrary, Webpack, Lerna, Storybook, Cytoscape, ChartJS, MapLibre 🏢 Description: For a client, we are looking for a Senior Frontend Developer Salary: 150-170 net+VAT B2B Hybrid model: 1 day per week from the office in Warsaw or Kraków RESPONSIBILITIES About our Team As a team member, you will have the possibility to participate in the whole development process in Network Cloud Team projects. The primary objective of our applications is to set up, configure, monitor, and optimize servers and networks for clients globally. Working in our team allows you to learn various network automation techniques, be part of and create a mobile network future, develop cloud-based applications and have a real impact on how it will look like. Role and Responsibilities Develop new features, as well as maintain existing ones. Implementation and maintenance of custom UI components library. Participate in code review, as well as UX design review. Cooperation with colleagues from other Centers around the world. REQUIREMENTS 5+ years of experience building complex web applications using JavaScript, TypeScript, HTML5, CSS3. Experience with React, Redux and Redux Toolkit; Familiarity writing well-tested, maintainable code (knowledge of Cypress.io and React Testing Library is a plus). Familiarity with REST API integration Proficient English communication skills. NICE TO HAVE Experience with Webpack; Experience with Lerna or other mono-repo solutions; Experience with Storybook and component libraries development; Experience with data visualization (knowledge of Cytoscape.js, react-chartjs-2, maplibre or similar libraries is a plus); WHAT DO WE OFFER ON THIS PROJECT? Cooperation based on a B2B contract and rate: 150-170 PLN/hour Hybrid work from Warsaw or Cracow (1 times a week in the office) The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the client. Events and integration meetings, as well as participation in various initiatives, e.g., sports. Access to the benefits offering (medical care, life insurance, Multisport card). WHAT DOES THE RECRUITMENT PROCESS LOOK LIKE? Application: Apply and submit your CV. After the application review, the recruiter will contact selected candidates by phone. Screening: Have a conversation with a speedapp recruiter about your experience. Next steps: The speedapp recruiter will explain the recruitment process for the specific position. The speedapp recruiter will stay in touch with you throughout the entire process. ABOUT SPEEDAPP At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch. DO YOU HAVE ANY QUESTIONS? Contact the recruiter responsible for this process directly. Iga Olszewska-Magnowska Senior IT Delivery Consultant iga.olszewska@speedapp.pl

🏢 Summary: Lead Frontend Developer role focused on stabilizing and further developing a complex React-based application integrated with hardware devices via a proprietary communication protocol. The position involves cross-platform development (web, desktop with Electron, embedded), code refactoring, and architectural decision-making in a highly complex technical environment. The role requires close collaboration with backend and hardware teams and contribution to system architecture. 🗂️ Requirements: Very strong experience as Lead Frontend Developer, Advanced knowledge of React, Advanced knowledge of JavaScript, Experience with Electron, Experience integrating applications with hardware or devices, Understanding of cross-platform systems (web, desktop, embedded), Ability to work with low-level communication protocols, Experience analyzing and refactoring complex systems, Understanding of backend architecture and collaboration 📃 Skills: React, JavaScript, TypeScript, Electron, IoT, Embedded, Protocols, Web, Desktop 🏢 Description: Salary: 1250-1450 PLN/day on B2B Remote: remote / hybrid Rzeszów (2 days from the office per week) Why choose this offer? Development and maintenance of a frontend application based on React and JavaScript Support in stabilizing the existing solution and identifying architectural issues Working with system–device communication (client’s proprietary protocol) Development of a desktop application based on Electron Collaboration with backend and hardware/embedded teams Analysis and refactoring of code shared across web, desktop, and embedded environments Contribution to designing the solution architecture in a cross-platform environment Supporting the team in making technical and architectural decisions Project We are looking for an experienced Lead Frontend Developer to support the team in stabilizing and further developing an existing web application that integrates with hardware via a dedicated network protocol. The project is complex in nature—the application communicates with hardware devices, and part of the codebase has been designed in a universal way, enabling its use across web, desktop, and embedded environments. Therefore, a strong understanding of such systems and experience working at the intersection of software and hardware are essential. Expected competences and knowledge Very strong experience as Lead Frontend Developer Advanced knowledge of React and JavaScript (TypeScript is a plus) Experience working with Electron Experience working with applications integrating with devices / hardware (e.g., IoT, embedded systems, device communication) Understanding of challenges related to cross-platform systems (web / desktop / embedded) Ability to work with more “low-level” system communication logic (proprietary or similar protocols) Experience in analyzing and refactoring existing, complex systems Good understanding of backend (in terms of collaboration and architecture) Ability to work in a highly complex technical environment Technologies you'll work with React JavaScript TypeScript Electron Client – why choose this particular client from the Jit portfolio? Our Client engineers technologies that enable the world of tomorrow to do more with less. They meet the growing need for infrastructure, food supply, energy efficiency and climate-friendly solutions . Their products and services are used in areas such as refrigeration, air conditioning, heating, motor control and mobile machinery. They are also active in the field of renewable energy as well as district heating infrastructure for cities and urban communities. Their innovative engineering dates back to 1933 and today our Client is a world-leader , employing more than 27,000 employees and serving customers in more than 100 countries . They are still privately held by the founding family. About Jit Team The Human factor of IT - it's not just a slogan, it's a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 700 experienced experts . We create highly specialised teams for clients from all over the world. We offer team members developmental projects, a wide range of benefits and a proprietary professional development programme. Behind our maxim are also charitable and educational activities. We support pupils and students by donating learning equipment. We offer internships to help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We are a Polish company and we share what we have achieved over 15 years of activity . By supporting indigenous initiatives, we ensure the circulation of good energy.

🏢 Summary: Senior Frontend Engineer role focused on building and evolving a browser-based 3D design platform for modeling real-world physical systems. The position involves owning frontend features end-to-end, contributing to frontend architecture, collaborating across teams, and occasionally working with backend systems in a hybrid Warsaw-based setup. 🗂️ Requirements: 5+ years building production user interfaces in JavaScript and TypeScript, React experience, Knowledge of component-based frontend architecture, Experience integrating frontends with backend services and APIs, Ability to own features end-to-end, Willingness to work with backend code, Knowledge of system design, testing, refactoring, and technical writing, CS degree or equivalent production software experience, Fluent written and spoken English 📃 Skills: TypeScript, JavaScript, React, GraphQL, three.js, PostgreSQL, Ruby, Rails, Python, Playwright, Git, CAD 🏢 Description: 💰 Salary: 24,000 - 28,000 PLN/month 💻 Hybrid, Warsaw (2 Days/Week) 🕦 Full-time ☑️ Employment contract (UOP) via Employer of Record We're looking for a Senior Frontend Engineer for a software company whose platform lets professionals design real-world physical systems in an interactive, browser-based 3D environment. You'd join the team that owns the core of the product: the design surface where users model actual sites in a 3D canvas, backed by CAD tooling and a data model that keeps designs accurate to the physical world. Working stack: TypeScript, JavaScript, React, GraphQL, three.js, PostgreSQL, Ruby on Rails, and Python. A senior individual contributor role reporting into engineering leadership. You'll own features end-to-end, from technical design through to production support, and help steer the frontend architecture the team relies on. Requirements: 5+ years building production user interfaces in JavaScript and TypeScript React experience and a firm grasp of component-based frontend architecture Experience wiring frontends to backend services and APIs Comfort owning features end-to-end, from scoping through to production Willingness to step beyond the frontend when a feature calls for it, including reading and touching backend code (Ruby on Rails familiarity is a plus) Engineering fundamentals: system design, testing, refactoring, and clear technical writing A CS degree or an equivalent hands-on track record shipping production software Fluent in written and spoken English Nice to Have: GraphQL in production three.js or another 3D graphics library Ruby on Rails or Python Playwright or a comparable end-to-end testing framework Git in a collaborative, multi-engineer codebase Any exposure to CAD software Experience with distributed teams in a hybrid setup Key Responsibilities: Build and ship frontend experiences that make designing faster and more accurate Partner with Product, Design, and Engineering to scope, build, and release features Write clean, well-tested code and raise the bar through code reviews and technical discussions Strengthen reliability with automated tests and a share of the team's on-call rotation Contribute to shared frontend architecture, tooling, and technical standards Pick up backend work when it's needed to land the features you own Support a collaborative engineering culture through mentoring, planning, and cross-team work

🏢 Summary: Mid Frontend Engineer role focused on building interactive, high-performance frontend applications for a browser-based 3D design platform. The position involves developing scalable React and TypeScript solutions, integrating with backend services, and contributing to CAD-like user experiences in a collaborative engineering environment. Hybrid work model in Warsaw with full-time employment via Employer of Record. 🗂️ Requirements: 3+ years of commercial software engineering experience, JavaScript, TypeScript, React, Experience building component-based frontend applications, Experience integrating frontend applications with backend APIs, Understanding of testing, maintainable code, and code reviews, Ability to own features from design to production, Familiarity with backend systems, English B2+/C1, Strong communication and collaboration skills 📃 Skills: JavaScript, TypeScript, React, GraphQL, three.js, PostgreSQL, Ruby, Rails, Python, Playwright, CAD 🏢 Description: 💰 Salary: 18,500–21,700 PLN gross/month 📍 Location: Warsaw, Poland (Hybrid – 2 days/week in the office) 🕦 Full-time ☑️ Employment contract via Employer of Record We're looking for a Mid Frontend Engineer for a software company whose platform lets professionals design real-world physical systems in an interactive, browser-based 3D environment. You'd join the team that owns the core of the product: the design surface where users model actual sites in a 3D canvas, backed by CAD tooling and a data model that keeps designs accurate to the physical world. Working stack: TypeScript, JavaScript, React, GraphQL, three.js, PostgreSQL, Ruby on Rails, and Python. You'll join a collaborative engineering team building intuitive, high-performance user experiences for a technically complex product, while working closely with Product, Design, and Backend Engineering teams. Requirements Minimum 3 years of commercial software engineering experience Strong experience with JavaScript , TypeScript , and React Experience building modern component-based frontend applications Experience integrating frontend applications with backend APIs Understanding of software engineering best practices, including testing, maintainable code, and code reviews Ability to own features from technical design through implementation and production Familiarity with backend systems and willingness to contribute beyond the frontend when needed Strong communication and collaboration skills Professional proficiency in English (B2+/C1) Nice to Have Experience with Ruby on Rails or Python GraphQL in production three.js or another 3D graphics library Experience with Playwright or similar automated testing frameworks Experience working in hybrid or distributed engineering teams Exposure to CAD or graphics-intensive applications Responsibilities Build modern, scalable frontend applications using React, TypeScript, and JavaScript Deliver intuitive user experiences for a complex web platform Own features end-to-end, from technical design through implementation, testing, deployment, and production support Collaborate closely with Product Managers, Designers, and Engineers to deliver impactful product features Integrate frontend applications with backend services and APIs Write clean, maintainable, and well-tested code Participate in code reviews, technical discussions, and architecture improvements Help improve frontend engineering practices, tooling, and application reliability Contribute to backend development when needed as part of a collaborative full-stack engineering environment

🏢 Summary: Full-time hybrid Software Engineer role focused on building responsive, AI-driven web applications for enterprise platforms using modern JavaScript technologies. The position involves developing high-quality React-based interfaces, applying TDD and CI practices, and collaborating within cross-functional Agile teams. Long-term B2B contract based in Warsaw with competitive salary. 🗂️ Requirements: 6+ years experience with JavaScript, 6+ years experience with TypeScript, Strong knowledge of design patterns in JavaScript, Proficiency in React with Redux, Experience with Next.js, Understanding of functional programming concepts, Strong knowledge of asynchronous programming, Experience with Git and branch management, Experience debugging front-end applications, Experience creating and integrating custom packages, Understanding of object-oriented programming principles, Practical experience with HTML5, Practical experience with CSS3, Experience in Agile environments, Ability to develop cross-browser compatible code 📃 Skills: JavaScript, TypeScript, React, Redux, Next.js, HTML5, CSS3, Git, TDD, CI, Agile 🏢 Description: 💰 Salary: 14,500-17,000 PLN/month 🌎 Hybrid from Warsaw, Poland 🕦 Full-time position, long-term ☑️ B2B We are looking for a Software Engineer to join our client, a technology company that builds AI-powered platforms and consulting solutions for enterprise operations, with a strong focus on the private capital sector. The company has over ten years of experience working with high-growth and PE-backed businesses, combining deep domain expertise with advanced technology to drive measurable results. Requirements: 6+ years of experience working with JavaScript and TypeScript Solid understanding of design patterns and how to apply them in JavaScript development. Proficiency in a modern front-end JavaScript framework such as React.js with Redux; experience with Next.js is an advantage. Familiarity with functional programming concepts. Strong grasp of asynchronous programming and its best practices. Knowledge of Git and experience with branch management. Experience troubleshooting front-end issues and using relevant debugging tools. Familiarity with creating and integrating custom packages. Good understanding of object-oriented programming principles and their use in JavaScript. Ability to perform effectively under pressure and meet strict deadlines. Practical experience with HTML5 and CSS3. Experience working within Agile development environments and practices. Strong communication and organizational abilities. Skilled in developing cross-browser compatible code. A Bachelor’s degree in Computer Science or a related field is preferred. Key Responsibilities: Creating and building responsive user interfaces using React. Applying and maintaining test-driven development (TDD) practices along with continuous integration processes. Working closely with a cross-functional team that includes project managers, analysts, and sales representatives to deliver high-quality, interactive products within deadlines. Promoting and implementing best practices in testing, accessibility, and performance optimization. Partnering with design, backend, QA, and product teams to develop reliable, user-focused solutions.

🏢 Summary: Full-time hybrid Software Engineer role focused on building and scaling a data-driven platform for planning and managing renewable energy projects. The position involves developing new features, improving existing systems, and contributing to architectural decisions in a distributed team. The offer includes long-term collaboration through Deel with competitive salary. 🗂️ Requirements: 5+ years of software development experience, Strong proficiency in Python, JavaScript, TypeScript or React, Experience writing maintainable object-oriented code, Experience designing APIs, Experience with relational databases, Experience running applications in cloud environments, Solid computer science fundamentals, Understanding of Agile and DevOps principles, Fluent English (spoken and written) 📃 Skills: Python, JavaScript, TypeScript, React, APIs, SQL, PostgreSQL, Cloud, Agile, DevOps, Redux, Flask, Celery, Redis, C++, WebGL, Three.js, CUDA 🏢 Description: 💰 Salary: 14,000-28,000 PLN 🌎 Hybrid from Warsaw 🕦 Full-time position, long-term ☑️ Contract through Deel The company develops software that helps businesses plan and manage renewable energy projects more efficiently. Its technology platform uses data and automation to simplify complex workflows, enabling teams to design, evaluate, and deliver energy solutions at scale. The overall goal is to make clean energy projects easier to develop and deploy. Requirements: At least 5+ years of experience in software development Strong proficiency in Python, Javascript, Typescript or React; writing clear, maintainable, and testable object-oriented code Good engineering judgment based on solid computer science knowledge Experience with designing APIs, working with relational databases, and running applications in cloud-based environments Understanding of Agile, DevOps and Lean values Strong communication and collaboration skills, especially when working in remote or hybrid teams Comfortable adapting to changes in a growing product and evolving technology stack, with the ability to make practical decisions and support the team as things scale Fluent in spoken and written English (please submit your resume in English) Nice to Have: Educational or practical experience in areas like applied math, geometric modeling (2D/3D), or electrical and electronic systems Exposure to technologies such as state management libraries (e.g. Redux), backend frameworks (like Flask), task queues and caching layers (Celery, Redis), relational databases (PostgreSQL), as well as lower-level or graphics-focused tools including C++, WebGL, Three.js, or GPU computing (CUDA) Strong interest in improving how software is built and delivered, including automating workflows, setting up pipelines, working with containers, and enhancing visibility and overall developer experience Key Responsibilities: Contribute to both ongoing systems and brand-new features, playing an active role in a distributed team environment Support and guide teammates through meaningful code feedback, collaborative coding sessions, and technical direction Question existing approaches, explore better alternatives, and advocate for solutions that scale effectively Take ownership of work items from early concept and research all the way through to release Partner closely with cross-functional groups, product, design, QA, and customer-facing teams to move important efforts forward Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/