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Senior Fullstack Engineer - React, Node

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SeniorWarszawaFull-timeExp.: 5+ years
Hybrid
Skills
React.jsRegularJavaScriptRegularTypeScriptRegularAPIRegularREST APIRegularJestRegularTestingRegularCypressRegularWebpackRegular
Fullstack
4 days ago

Senior Frontend Developer (React)

Join a product-driven team building scalable, modern web applications — with a growing focus on AI-driven features.

We’re looking for a Senior Frontend Developer with strong expertise in React to help us design and build high-quality, performant user interfaces.  This role goes beyond building UI — you’ll collaborate closely with  backend engineers, product teams, and designers to create cohesive,  intelligent user experiences. We're especially interested in candidates  who bring experience from product companies and are excited by the potential of AI-powered interfaces.

This  is a great opportunity for someone who understands both front-end  architecture and how systems behave behind the scenes — someone who  wants to help shape the user experience of intelligent, modern products.

🔧 What You'll Do

  • Build responsive, accessible, and dynamic interfaces using React and TypeScript
  • Work closely with backend teams to define API contracts and ensure seamless integration between front-end and server logic
  • Contribute to the design and development of AI-enhanced features that streamline and enrich the user experience
  • Drive front-end architecture decisions and help define engineering best practices
  • Collaborate with design and product teams to transform ideas into intuitive, user-friendly flows
  • Improve performance, maintainability, and scalability of front-end systems
  • Champion test coverage, accessibility, and code quality through CI pipelines and peer reviews
  • Contribute to design system adoption and front-end tooling improvements
  • Mentor junior developers and share knowledge within the team

✅ What You Bring

  • 5+ years of experience building modern web applications, preferably in product-focused environments
  • Advanced proficiency in React, JavaScript, and TypeScript
  • Experience working with back-end  engineers and a solid understanding of how APIs, databases, and system  architecture impact front-end development
  • Familiarity with REST APIs and asynchronous data handling (Promises, async/await, etc.)
  • Strong testing practices (Jest, React Testing Library, or Cypress) and code review discipline
  • Knowledge of modern tooling like Webpack, Vite, or similar build systems
  • Experience with design systems, Figma, and libraries like ag-Grid or Highcharts
  • Bonus: Experience building or integrating AI-powered features, e.g. using OpenAI, Hugging Face, or custom ML models
  • Clear communication skills and the ability to collaborate effectively across roles
  • A product mindset — you care about what you’re building, not just how

35 000 - 42 000 PLN

(gross/month)

Full-stack developers possess the skills to work on both the frontend and backend of applications. They are versatile in their knowledge of various programming languages and frameworks, allowing them to build complete web solutions. Proficiency in both client-side and server-side technologies, along with a solid understanding of databases and APIs, is crucial for success in this role.

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