Felix Rieseberg, an Electron co-maintainer and open source contributor, currently works on Claude at Anthropic, where he leads engineering efforts on Claude.ai, Cowork, and Code Desktop, according to his homepage.
Rieseberg’s career spans multiple major tech companies and roles. From 2023 to 2025, he led the Web Infrastructure and Desktop App teams at Notion. Before that, from 2021 to 2023, he led the Payments Integration Experience team at Stripe, working on the future of payments infrastructure.
His tenure at Slack, from 2016 to 2021, saw him work as a Senior Staff Engineer and Engineering Manager. During this period, he supported a team of C++ engineers building Electron, the cross-platform desktop framework, and worked on Slack’s desktop applications for macOS, Windows, and Linux. He authored an O’Reilly guide titled “Introducing Electron” during this time.
Earlier in his career, Rieseberg spent 2014 to 2016 as an Open Source Engineer at Microsoft, focusing on releasing quality code on GitHub and advocating for improved developer experiences. He built tools including windows-build-tools and npm-windows-upgrade. Before that, from 2011 to 2014, he worked as a Startup Developer Evangelist for Microsoft Germany and Microsoft Silicon Valley, initially based in Berlin before relocating to the San Francisco Bay Area.
Rieseberg’s startup experience includes leading Apfeltalk.de, a major German tech publication focused on iOS and macOS, from 2007 to 2011 as Executive Editor. The site grew from a small community to serve 10 million monthly users, making it one of Europe’s largest tech sites during that period.
Beyond his primary roles, Rieseberg maintains numerous open source projects, including Language Model Builder, MCBP, windows95, macintosh.js, and clippy. He also authored an O’Reilly book on Windows App Development with JavaScript and developed Awesome Zombie Sniper, a cross-platform game created to explore development challenges across Windows, Windows Phone, and Xbox using Unity.
Academically, Rieseberg holds an MSc from the University of Oxford’s Internet Institute, where he researched at the intersection of sociology, law, economics, and computer science. He studied at the University of Duesseldorf and served as a visiting lecturer for app development.
Key facts
- Rieseberg currently leads engineering at Anthropic on Claude.ai, Cowork, and Code Desktop
- He previously led teams at Notion (Web Infrastructure and Desktop Apps), Stripe (Payments Integration), and Slack (Senior Staff Engineer, Engineering Manager)
- He is an Electron co-maintainer and maintains numerous open source projects
- He authored an O’Reilly guide on Electron and a book on Windows App Development with JavaScript
- He led Apfeltalk.de from 2007-2011, growing it to 10 million monthly users