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CommIT

Senior React Engineer (Next.js)

CommIT Warsaw, Masovian Voivodeship, Poland

Software Development · 501-1,000 employees

4 d ago
react Senior (5-10 yrs) Full-time Poland
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About the role

You will design, build, and ship high-performance, responsive web interfaces while partnering with product managers and designers. Additionally, you will manage roadmaps and contribute to technical quality through code reviews and mentoring.

What they look for

Next.js React TypeScript JavaScript Tailwind CSS Monorepos Yarn Nx HTML CSS Responsive design Accessibility Vite Node.js Git AWS

Requirements

Candidates must have at least 5 years of professional experience with React and Next.js, along with strong proficiency in TypeScript and modern web tooling. Experience with monorepos, cloud providers, and accessibility best practices is also required.

Full description

We’re a high-growth fintech startup building products for the financial markets, and we’re looking for a senior Senior React Engineer (Next.js) to own our most critical frontend experiences. You’ll partner closely with product and design to ship intuitive, high-performance interfaces, and help us scale to millions of users.

What you’ll do:

  • Design, build, and ship high-performance, responsive web UIs
  • Partner with product managers, designers, and analysts to translate user needs into elegant product experiences
  • Plan and execute short- and long-term roadmaps balancing user impact, technical quality, and delivery speed
  • Raise the bar through code reviews, mentoring, and improvements to our tooling and processes

Requirements

Must-have expertise:

  • Next.js (our web app is built with Next.js)
  • Monorepos using Yarn Workspaces or Nx
  • Tailwind CSS (our primary design system)

Technical requirements:

  • 5+ years of professional software development experience
  • 5+ years with React and its ecosystem (e.g., Redux, React Router)
  • Strong proficiency in JavaScript (ES6/ES7) and TypeScript
  • Deep knowledge of HTML/CSS, responsive design, and accessibility (a11y) best practices
  • Hands-on with modern build tooling and package managers (Vite, esbuild, Yarn)
  • Experience with server-side rendering and Next.js, plus working knowledge of Node.js
  • Comfortable with Git workflows and agile methodologies
  • 3+ years working with major cloud providers (AWS/GCP/Azure)
  • Storybook

Nice to have:

  • Experience with monorepo release management and internal package versioning
  • Familiarity with performance profiling, Web Vitals, and SEO in Next.js
  • E2E testing (Playwright/Cypress) and CI/CD pipelines
  • Experience in fintech or data-heavy, real-time UIs

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