Senior Frontend Engineer
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Job Description
Senior Frontend Engineer building React interfaces, collaborative flow tools, and NestJS BFFs for an AI agent platform. Evolving Mantine design systems and testing product experiences.
Responsibilities:
- Build and evolve React interfaces for an AI agent platform, including conversation and prompt engineering tools, graph-based collaborative flow builders, agent configuration and testing interfaces, and call analytics dashboards
- Implement interfaces based on Figma designs
- Own and develop the NestJS BFF layer
- Aggregate REST microservices through typed clients generated from OpenAPI
- Handle authentication, pagination, streaming, and error contracts to keep the frontend layer thin
- Contribute to backend development with PostgreSQL and Redis
- Evolve and maintain the frontend component ecosystem
- Consolidate legacy Ant Design components into a Mantine-based design system
- Own the shared UI library and Storybook
- Maintain consistency across multiple product applications
- Ensure product quality through Vitest unit/component testing and Playwright end-to-end and critical user-flow testing, including SDK functionality
- Collaborate across teams and product v-teams on API contracts, SDK protocols, code reviews, bug fixes, QA support, and test scenarios
- Join initiatives requiring frontend or platform expertise
- Partner with the documentation team to create and maintain integration guides and practical code examples
Requirements:
- 6+ years of professional experience in frontend/full-stack product development
- 5+ years of React in production
- Strong senior-level TypeScript expertise, including strict mode, React 19, Vite, and monorepos
- 2+ years of Node.js development on the server
- Hands-on experience building and operating BFF or API gateway layers
- Understanding of service aggregation, authentication, pagination, error contracts, and clear BFF boundaries
- Strong production experience in microservice environments, ideally with 10+ services
- Experience building complex, stateful UIs such as graph/canvas editors or collaborative interfaces
- Experience with undo/redo, optimistic updates, conflict handling, and non-trivial state management
- Strong frontend architecture and code organization skills; familiarity with FSD or modular/layered architectures
- Ability to work within an established team architecture
- Strong product sense and autonomy in making UI and UX decisions from product context and an existing design system
- Hands-on experience writing and maintaining unit/component tests with Vitest
- Hands-on experience with end-to-end tests using Playwright
- Hands-on experience with React Query, Socket.io, Prisma, and PostgreSQL
- Hands-on experience with AI-assisted development tools such as Claude Code, Cursor, Codex, GitHub Copilot, or similar agentic coding tools
- Ability to understand where AI agents add value and where they require human oversight
- Experience with development workflows integrating agent instructions and automated reviews into the repository/CI
- Nice to have: shared component library ownership or legacy UI migration to a new design system
- Nice to have: real-time collaboration technologies such as Yjs, Automerge, or operational transforms
- Nice to have: WebRTC or SIP in the browser
- Nice to have: Prisma or Kysely and PostgreSQL query optimization
- Nice to have: Kubernetes/Helm and OpenTelemetry or Prometheus
- Nice to have: domain experience in voice AI, telephony, contact centers, conversational AI, or LLM-based products
Benefits:
- Fully remote across Europe
- 21 vacation days + public holidays + 5 sick days
- Private English lessons via Preply
- Cutting-edge tech stack including Speech Technologies, NLP, Generative AI (LLMs, diffusion models), and voice-first agentic architecture with privacy-first and on-premises deployment
- Fast career progression
- Startup pace with enterprise stability, real clients, real revenue, and no bureaucracy
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