Senior Full Stack Engineer — TypeScript / Next.js (100%, m/f/d)

• Own the German market on our customer-facing platform: credit and compliance requirements, dealer flows, German copy, and the acceptance criteria that make them verifiable
• Design and build the digital application journey — multi-step forms, validation, resumable state, document upload, KYC steps and the unhappy paths users actually hit
• Build and maintain the customer, dealer and operations portals, including the operations board and the logic that decides where a case belongs
• Write the use-case and API layers behind the journey to our clean-architecture standard — this is a full-stack role, not a UI role
• Own field-level mapping into the CRM and the Flowable-based process engine — beneficial ownership, source of funds, origin of income, additional persons — where a wrong key is a compliance defect, not a cosmetic one
• Author specification-driven change proposals, and act as the named human approver for journey and mapping changes in the German market
• Grow end-to-end test coverage on the critical journeys: coverage is what licenses autonomous agent work in a module
• Work with our Berlin backend team on the seam between the orchestration core and the customer-facing platform, and with our Jakarta platform engineers who own the journey across all three markets
• Communicate clearly in German and English with engineering peers and business stakeholders

Your profile

• 6+ years of full-stack TypeScript engineering, with recent production work in React and Next.js App Router — server components, server actions and route handlers, with a clear grasp of what runs where — is mandatory
• Fintech experience is mandatory: production work on a regulated financial product — leasing, lending, banking, payments or insurance — where money moved and a regulator could ask why
• Proven ownership of a complex multi-step onboarding or application flow is mandatory: validation strategy, partial persistence and resumption, conditional branching by market or product, document upload
• Real backend capability: use cases, repository implementations, API handlers and PostgreSQL / Prisma queries — roughly a 60/40 split toward the frontend, not 90/10
• State and data-fetching maturity (Zustand or equivalent, TanStack Query) and confident use of form and schema tooling (Formik or React Hook Form with Zod), including server-side validation parity
• End-to-end testing with Playwright or Cypress on flows that are slow, stateful and integration-dependent
• AI-first engineering mindset: daily use of coding assistants and agents on production work, and the ability to write a change specification precise enough that an agent implements it correctly and a reviewer can verify that it did
• Working understanding of the German regulatory environment for consumer credit or asset finance — BaFin-supervised context, AML/KYC obligations, consumer-credit disclosure — is a strong plus
• Internationalisation as a habit — no hard-coded strings, and awareness of what four locales do to layout and copy
• Fluent German and English

Why us?

• Founding-team-level ownership of our customer-facing platform and of the German market on it
• Direct collaboration with the CTO and the founders, including regular visits to our Swiss headquarters
• A genuinely AI-first process, not a slogan: specification-driven delivery where agents execute approved changes and humans own scope, architecture, regulatory and release decisions
• Hybrid setup with 2-3 days per week in our coworking office in Berlin (WeWork, Stresemannstrasse)
• Competitive and fair salary: €70,000 - €90,000 gross per year, depending on experience and impact
• 10–15% annual bonus tied to company performance and clear OKRs
• Tax-free monthly benefit allowance of €50 that you can use for what you personally value
• Sustainable mobility budget: subsidy for e-bike leasing and app-based car sharing for occasional trips
• Additional health insurance options, including enhanced coverage for dental and vision care
• Company-supported pension scheme with employer contributions on top of the statutory system
• Employer-funded disability coverage starting from day one of employment
• Dedicated AI tooling budget (e.g. Cursor, Claude API) so you can experiment and move fast
• Modern Apple devices
• Our remote policy promises 4 weeks & worldwide