Senior Frontend Software Engineer (Team Leader) @ Wakacje.pl

Advanced JavaScript (ES6), including design patterns​ Deep understanding of asynchronous programming (event loop, promises, async/await) Browser performance optimization techniques Strong TypeScript expertise Designing scalable type architectures for large codebases Best practices for TS in monorepos or multi‑module environments React expert-Level Skills Rendering optimization (memoization, useCallback, useMemo) State management solutions such as Redux Deep Knowledge of Next.js App Router & Ser…