Felix Rieseberg Details Career Spanning Anthropic, Slack, and Open Source
Veteran software leader shares milestone achievements across desktop platforms and modern AI interfaces.
1Engineering Focus at Anthropic
Felix Rieseberg currently leads engineering efforts around Claude at Anthropic. His focus centers on making users productive with artificial intelligence interfaces. Across his tenure, he has directed engineering for Claude.ai, Cowork, and Code Desktop while exploring new applications that maximize artificial intelligence capabilities for end-user productivity.
2Stewardship of Desktop Frameworks
Beyond his corporate roles, Rieseberg serves as a co-maintainer of the open source Electron framework. He previously authored an O'Reilly guide titled Introducing Electron. His open source background includes widely recognized side projects such as windows95, macintosh.js, Language Model Builder, MCBP, and a modern recreation of Clippy.
3Infrastructure Leadership at Notion
Between 2023 and 2025, Rieseberg headed the Web Infrastructure and Desktop App teams at Notion. His responsibilities required overseeing client-side foundational architecture and desktop performance. This work ensured seamless multi-platform application delivery for millions of knowledge workers relying daily on Notion's connected workspace products across operating systems.
4Payments Experience at Stripe
From 2021 until 2023, Rieseberg directed the Payments Integration Experience group at Stripe. This specialized team developed forward-looking developer interfaces and integration pathways for global payments. The group tackled developer friction points, helping merchants adopt Stripe services smoothly while establishing scalable architectural patterns across complex modern checkout flows.
5Scaling Desktop Apps at Slack
From 2016 to 2021, Rieseberg served as Senior Staff Engineer and Engineering Manager at Slack. He supported teams building Slack's desktop clients for macOS, Windows, and Linux. His work heavily involved underlying C++ and Node.js components within Electron, shaping client performance during Slack's critical hypergrowth phase.
6Open Source Advocacy at Microsoft
Between 2014 and 2016, Rieseberg worked as an Open Source Engineer at Microsoft. He released developer tooling on GitHub, including windows-build-tools and npm-windows-upgrade. Before that, from 2011 to 2014, he operated as a Startup Developer Evangelist covering startup ecosystems across Berlin and the San Francisco Bay Area.
7Early Career and Publishing
Between 2007 and 2011, Rieseberg served as Executive Editor of German tech publication Apfeltalk.de, scaling monthly traffic to ten million users. He also authored a German book on Windows development and built Awesome Zombie Sniper, an exploratory multi-platform Unity game that reached over one million players.
8Academic and Research Background
Rieseberg holds a Master of Science degree from the University of Oxford's Internet Institute. His academic research examined the intersection of sociology, law, economics, and computer science. Prior to Oxford, he studied at the University of Duesseldorf, where he also worked as a visiting lecturer teaching application development.