Strong Middle Frontend Developer

We are looking for a Strong Middle Frontend Developer to join the project full-time. This person will be the primary FE contributor - no splitting between projects. They need to be a thinking partner not an executor - someone the clients technical leadership wants to work with directly.

Your responsibilities will include:

• Own any part of the frontend end-to-end architecture decisions performance work integration testing without hand-holding.

• Work directly with the clients technical leadership as a thinking partner.

• Navigate and extend a large strictly-conventioned module-based codebase.

• Cover any part of the frontend independently no thats not my area.

• Use AI-assisted development (Claude Code / Cursor / Copilot or equivalent) fluently and extensively as a primary tool.
  
  

What we expect from you:

Core stack:

• TypeScript (strict) no-any no-implicit-any codebase; comfortable with generics discriminated unions unknown narrowing and -style inference.

• React 19 15 (App Router) understands the Server Component / Client Component boundary server-side data fetching in RSCs layouts vs. pages route groups middleware Server Actions.

• Modern React patterns custom hooks as the primary unit of logic controlled state effects used sparingly and correctly deliberate memoization; smart/dumb component separation.

• State management Zustand: store design selectors provider-scoped stores SSR hydration concerns.

• Forms React Hook Form Yup: schema-driven validation server-error mapping back onto fields controlled/uncontrolled trade-offs.

• Styling MUI v7 Emotion: theme-token-driven styling sx API no hardcoded values.

• Data layer Axios: REST integration interceptors token refresh / 401 retry flows typed API clients.

• Testing Vitest React Testing Library: meaningful component and hook tests (queries by role/label not implementation details).

Foundations:

• Performance reasoning can diagnose re-render storms understand Reacts reconciliation and memoization model reason about bundle size code-splitting SSR/streaming Core Web Vitals.

• Architecture & data flow can navigate and extend a large strictly-conventioned module-based codebase; respects existing architecture and knows when a pattern should be challenged.

• Auth & app-level concerns token-based auth session handling multi-tenant routing.

• Browser & web fundamentals solid on HTTP caching cookies the event loop rendering accessibility basics.

Tooling:

• AI-assisted development (Claude Code / Cursor / Copilot or equivalent) as a primary tool non-negotiable.

• Git discipline conventional commits granular atomic history clean PRs.

• ESLint / Prettier / strict CI comfortable working inside an opinionated heavily-linted codebase.

Nice to have:

• Mapbox GL or other data-visualization / mapping / charting experience.

• next-intl or other i18n frameworks.

• Sentry or comparable observability / error-monitoring tooling.

• WorkOS / Auth0 / Clerk or similar managed-auth experience.

What We Offer:

• Work at a Top-employer company (according to DOU 2025).

• A strong culture built on empathy trust openness and real care for employees.

• Competitive compensation with regular reviews.

• Paid vacation and sick leave.

• Medical insurance.

• Personal learning budget and access to top HR tools platforms and practices.

• Team events and regular team-building activities.

• Flexible hybrid work model with an office in central Kyiv.