Senior Frontend Developer Warsaw

Location: Warsaw!
Start: as soon as possible
Duration: long-term
Languages: Polish is mandatory !!, English: B2

Hybrid: 1-2x week in Warsaw | 4+ years React exp | English B2+
 

• Core Stack: Expert-level React 19+ (Hooks, Suspense, RSC) and TypeScript (Strict Mode, Utility Types, Generics).
• Architecture: Next.js (Web) and Turborepo/Nx for unified monorepo management across platforms.
• State & Forms: XState/TanStack Query (no Redux), Zod, React Hook Form, and nuqs for type-safe params.
• Styling & UI: Tailwind CSS v4+ and NativeWind for cross-platform component consistency.
• Performance Engineering: Expert profiling of Core Web Vitals (LCP, INP, CLS) and React Native bridge/memory optimization.
• Quality Assurance: Vitest, React Testing Library, and Playwright with a focus on 80%+ critical path coverage.
• BFF & API: Next.js API routes and oRPC for end-to-end type safety.
• AI & Security: Designing agentic workflows for dev-velocity; expert OWASP Top 10 mitigation and dependency auditing.