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

Your mission

You are the architect and builder of the customer-facing side of the LEASETEQ platform in Berlin, and the owner of our German market on it. You design the digital application journey and the portals that carry real customers, dealers and operations teams at production scale, and you make sure German credit rules, compliance requirements and dealer flows are represented correctly in a platform that also serves Switzerland and Austria. You work in a small, senior team where your decisions have direct product impact, and you naturally bring AI tooling into your daily engineering workflow without being asked.

What you will do

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

About LEASETEQ

LEASETEQ builds the orchestration brain for mid-market car leasing and asset finance in the DACH region. Our platform automates the full contract lifecycle – from origination and credit decision through to end-of-term – using Flowable BPM as the core process engine on a modern, event-driven micro-services architecture, with a Next.js / TypeScript platform serving our customer, dealer and operations portals in four languages across Switzerland, Germany and Austria.

We are an AI-first engineering team: agents, intelligent workflows and LLM-augmented automation are how we build today, not items on a future roadmap. From our base in Switzerland, our subsidiaries in Austria and Germany and our engineering team in Jakarta, you join a small, senior team where your decisions have visible impact on customers, partners and the future of our product.

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