Lead Frontend Engineer (next.js)

For Digital Hub Warsaw, we are looking for: Lead Frontend Engineer  You’ll build the user interface for myGenAssist, an enterprise AI assistant platform. The frontend is a Next.js application with real-time AI streaming, rich text editing, workflow builders, and voice capabilities.   Key Tasks & Responsibilities: • Build and maintain features using Next.js (App Router), React, and TypeScript. • Develop reusable UI components using Mantine and Tailwind CSS, following our design system and dark mode support. • Implement real-time AI interactions including streaming chat responses (SSE), tool-call rendering, and agent workflow visualization. • Manage client-side state with Zustand and data fetching with SWR. • Optimize application performance across devices — code splitting, lazy loading, efficient re-renders. • Write unit tests (Vitest) and E2E tests (Cypress). PRs require test coverage, enforced in CI. • Participate in code reviews with attention to TypeScript correctness, accessibility, and responsive design. Qualifications & Competencies (education, skills, experience):  • 7+ years with React and TypeScript in production • Strong Next.js experience (App Router, server/client components) • TypeScript in strict mode • Experience with a component library (Mantine preferred, or MUI/Chakra — willingness to learn Mantine) • Tailwind CSS • State management with Zustand, Redux, or similar • Experience with SSE or WebSocket streaming for real-time UIs • Testing with Vitest or Jest + Testing Library; familiarity with E2E testing • Git and PR-based workflow What do We offer: • A flexible, remote-hybrid work model • Great workplace in a new modern office in Warsaw • Career development, 360° Feedback & Mentoring programme • Wide access to professional development tools, trainings, & conferences • Company Bonus & Reward Structure • VIP Medical Care Package (including Dental & Mental health) • Holiday allowance (“Wczasy pod gruszą”) • Life & Travel Insurance • Pension plan • Co-financed sport card - FitProfit • Meals Subsidy in Office • Budget for Home Office Setup & Maintenance • Access to Company Game Room equipped with table tennis, soccer table, Sony PlayStation 5 and Xbox Series X consoles setup with premium game passes, and massage chairs • Tailored-made support in relocation to Warsaw when needed • Please send your CV in English  WORK LOCATION: WARSAW AL. JEROZOLIMSKIE 158