CV

SUMMARY

Senior full-stack engineer specializing in TypeScript, React, Node.js, and AI, with 30 years of professional experience. Building web applications with LLM integration, using agentic coding (Claude Code, Cursor).

EXPERIENCE

Parloa – AI-based Contact Center Platform
Frontend Developer | Mar 2025 – Dec 2025

Scaleup with a $3 billion valuation, serving Booking.com, Amex, Generali, Allianz, TUI.
Designed and implemented a server-driven UI (SDUI) package, enabling backend developers to declaratively build UIs for their services.
Also worked on features such as evaluations system, GPT-5 integration, multi-agency, UI component library
Developed primarily through agentic AI coding (Claude Code, Cursor)
Tech: TypeScript, React, Next.js, Ant Design, Vite, Storybook, React Testing Library, tRPC, OpenAPI

Next Logistics Ventures – seabo
Lead Full-Stack Developer | Oct 2022 – Apr 2024

Introduced NestJS as a second backend stack, the foundation for new features and a gradual migration off PHP
Extended chartering marketplace
Built vessel database, added subscription billing, rebuilt realtime updates
Led frontend and full-stack developers and drove technology decisions (NestJS, OpenAPI, BullMQ, TypeORM)
Tech: TypeScript, Node.js, NestJS, React, MySQL, OpenAPI, TypeORM, Stripe, Redis, BullMQ, socket.io

ISV (Confidential) – Confidential
Lead Frontend Developer | Jul 2020 – Sep 2022

Modernized 7-year-old JavaScript React codebase: migrated to TypeScript, introduced automated testing, adopted component library
Led and coached 4-person frontend team. Improved velocity while raising quality and adding new features
Tech: TypeScript, React, Redux, React Query, Jest, React Testing Library, Ant Design

Zalando – Procurement Portal
Lead Frontend Developer, Coach | Sep 2019 – Mar 2020

Led greenfield frontend development for Zalando's procurement platform, supporting roughly €1 billion in annual fashion purchases
Selected technologies, designed frontend architecture, and coached 4 developers with React and MobX workshops. Worked in a team of 12.
Tech: TypeScript, React, MobX, GraphQL, Apollo, Ant Design, Material-UI, Jest, React Testing Library

DMG – Dentamile Connect (Dental CAD/CAM SaaS)
Frontend Developer | Jan 2019 – Aug 2019

Frontend development for a SaaS for digital production of dental products (crowns, bite splints) with browser-based 3D CAD using WebGL
Designed and negotiated API between SaaS and WebGL CAD component built by partner agency; set up UI component library
Tech: JavaScript, React, Redux, Node.js, REST, Swagger, Jest, Storybook, Webpack

Selected Earlier Projects (full history: stefanwille.com/work)


2018	Intersection	Frontend Developer	React
2017–2018	HRS Innovation Lab	Full-Stack Developer	React, Node.js
2016	Movinga	Full-Stack Developer	Ruby on Rails
2016	Jobkraftwerk	Lead Frontend Developer	React
2015	Nokia HERE	Lead Backend Developer	Ruby on Rails
2014	Fyber	Backend Team Lead	Ruby on Rails
2013–2014	SAP	Backend Developer	Ruby on Rails
2009–2013	Papersmart / Balao	CTO & Co-Founder	Ruby on Rails
2002–2009	Reuters, O₂, BizSphere	Backend Developer / Team Lead	Java EE
1996–2000	NETLIFE	VP Research & Development	C++, Java

PROJECTS & PUBLICATIONS

Billet – CLI coding agent built directly on the Anthropic SDK: agentic loop, bash and text editor tools, plan mode, eval suite (TypeScript, Anthropic SDK, Bun) – GitHub
Smart Rename – AI-based desktop app that extracts invoice metadata and auto-renames files (Vercel AI SDK, Evalite, Tauri, TypeScript, React) – stefanwille.com/smart-rename
Recto – published web tool for planning book page layouts, in production use on a 400-page book project (TypeScript, React, Supabase) – rectostudio.com
Author and co-author of two books on Java and enterprise software development

EDUCATION & LANGUAGES

Bachelor's degree in Computer Science, University of Hamburg
German – Native (C2) · English – Fluent (C1)