Custom software development
AI-assisted design and build of web apps, backends, APIs and integrations. TypeScript/Node/React, Swift/React Native, AWS.
Services
Embedded engineering capacity
Senior hands inside your existing team when you need to ship faster. Contract-based, remote-first, CET with US-East overlap.
Technical consulting
Architecture reviews, technology selection, adopting AI in your development process, cloud migration, CI/CD, code audits.
Product partnershipsLimited slots
Co-development with revenue share for products with license or subscription models.
Experience
Opens in a new tabBuilt subscription, paid-DM, livestream and payments features on a creator-monetization platform that has raised $60M+.
Joined a creator wishlist platform as the first engineering hire and helped scale it from 50k to 150k users.
Led a team shipping iOS, Android and web apps for the club and its events.
How I work
Small surface, deep ownership
One engineer, end to end. No handoffs, no account managers, one person who answers for the code.
Ship weekly, demo always
Working software every week. You see it running, not summarized in a status report.
Boring tech, exciting products
Proven stacks, careful architecture. New ideas belong in the product, not in the infrastructure.
AI-assisted, engineer-owned
AI tooling runs through how I design and build. Nothing ships that I have not reviewed, tested, and can walk you through line by line.
Swiss contracts. GDPR- and revDSG-aware engineering. Work performed from Switzerland.
About
I'm Jonas Derissen, a software engineer with a BSc in Computer Science from ETH Zürich and four years of startup experience across the US, London, Berlin and Switzerland. I build products that charge money: subscriptions, payments, consumer apps. Derissen Software Engineering is my one-person practice in Zug.
German (native) · English (C1) · French (B1)