Senior Frontend Developer

We are looking for a Senior Frontend Developer to join our team.

About the project: a biometric identity platform. The libraries we build encapsulate handling of biometric data and drive access-level logic across consumer applications — a regulated domain with hard constraints on how data is stored and used.

Responsibilities

Design, build and maintain TypeScript libraries and reusable packages consumed by other product teams

Build reusable React components and modules with clean, type-safe public APIs

Define and maintain state management patterns at the library level

Own versioning and backward compatibility: semver, changesets, breaking-change policy, migration guides

Maintain the build and publish pipeline: bundling (Rollup / tsup / Vite), ESM + CJS output, tree-shaking, bundle-size budgets, peer dependencies

Encode access-control rules in the type system so consumers cannot access or render data beyond their permission level

Cover libraries with unit and type-level tests; keep the public API stable and regression-safe

Leverage AI-assisted tools to accelerate development workflows

Participate in code reviews and contribute to internal engineering standards

Requirements

7+ years of commercial experience in front-end development

Proven experience building and maintaining TypeScript libraries/packages consumed by other teams

Deep knowledge of TypeScript: generics, conditional and mapped types, discriminated unions, branded types, declaration output

Experience with state management solutions

Experience with monorepo tooling (pnpm workspaces, Nx or Turborepo)

Strong hands-on experience with React

Testing: Vitest/Jest, React Testing Library, type-level testing (tsd / expect-type)

Solid understanding of REST services and API contract design

Understanding of access-control models (RBAC / ABAC)

Experience with AI-assisted development tools (Claude Code, Codex, Cursor, etc.)

Upper-Intermediate level of English or higher

Self-motivated, proactive and detail-oriented

We Offer:

Innovation Culture: Work in a team that actively experiments with AI and modern development approaches

Real Product Impact: Direct collaboration with a client and influence on product decisions

Flexible Work: Remote work or a modern office in Kyiv

Generous Time Off: 20 paid vacation days + 15 sick leave days annually

Professional Growth: Compensation for courses, certifications, and learning resources

Cutting-Edge Tools: Access to premium AI tools (Cursor Pro, Сlaude Code, Codex, etc.)

Recruitment Process:

CV Review

HR&Technical Interview

Client Stage

Job Offer