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Frontend Engineer (React)

Warsaw Office💼 Full-time🗓 2026-07-29 → 2026-09-26

Core

Design and own business-critical user experiences for agentic AI products, building production Next.js applications with complex state and real-time AI interactions.

Role type

Senior Frontend Engineer (React/Next.js)

Builds

Production Next.js SSR applications, AI-powered interfaces (streaming LLM responses, semantic search, knowledge graphs), and component libraries.

Domain

Enterprise AI / Agentic AI / SaaS

Deliverable

production ML models | product features

Required skills

React, TypeScript, Next.js (SSR, App Router, Server Components), complex state management, real-time collaboration, AI/LLM interface design, Core Web Vitals optimization, accessibility, localization, security-conscious engineering, AI coding agents usage.

Preferred skills

React Flow, Highcharts, vector search UIs, RAG interfaces, Node.js/Python, design systems, open-source contributions.

Technologies

Next.js, React, TypeScript, Node.js, Python, Claude Code, OpenAI Codex, GitHub Copilot, React Flow, Highcharts.

Responsibilities

Design and ship production Next.js SSR applications with complex state and high-load scenarios; Build interfaces for AI-powered features including streaming LLM responses and semantic search; Architect component libraries and maintain the design system; Monitor performance in production and optimize bundle sizes; Conduct code review and mentorship to maintain high code quality.

Seniority

Senior, hands-on IC

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