Staff Frontend Engineer / Frontend Architect (m/f/d)

IntroductionTeaserTwo products, two backends, one frontend vision: build the AI-first frontend platform and design system that lets our engineers, product managers and designers ship UI at speed. A senior hands-on role with architect-level influence, no people management, and our CPTO as your executive sponsor.Role at a glanceLevel: Staff/Principal-level individual contributor – technical leadership, no direct reportsReporting line: VP Engineering. Executive sponsor: our CPTOProducts: FactFinder NG (React on a Java backend) and Infinity (React on a .NET/F# backend)Stack you'll shape: React, TypeScript, Web Components, design tokens, Storybook, AI coding tools (Claude Code, Cursor, MCP-based tooling)Team: Product & Technology organization of around 25 people, led by our CPTO, working in a product trio model with product and designLocation: Berlin; Munich, Pforzheim or Stockholm possible – hybrid with 2–3 office days per week; occasional travel (<10%) for offsites and design-system workshopsStart: as soon as possibleAbout FactFinderFactFinder is one of the leading product discovery platforms for European eCommerce. For more than 20 years we've applied AI and machine learning to product search, navigation, personalization and recommendations. Our Product Discovery Experience (PDX) spans two products: FactFinder NG, an exact and highly configurable search, and Infinity, a self-learning, behavioral discovery engine. More than 2,000 customers generate over €160 billion in annual GMV on our platform.We're around 90 people with a new management team, a clear growth plan and reknown investors behind us. Right now we're rebuilding our product and tech organization around an AI-first way of working and agentic commerce – and this role sits at the center of it.Why this role existsOur two products run two React frontends with very different technical roots. We need a vision, an architect, and an owner — someone who will unify them into a single, efficient system, build th