Fabien Penso
Member Of Technical Staff at Microsoft AI
San Francisco, California, United States
Summary
🤩
Rockstar🎓
Top SchoolFabien Penso is a Principal Engineer with 16 years of experience building high-performance, privacy-focused infrastructure and blockchains, currently authoring the Dango/Grug Rust stack and its indexer. He founded Constellations, a Rust indexer that can process >5,000 blocks/sec and powers content for Stargaze with millions of daily requests, and has turned side projects into production-critical systems. His background spans startups and exits (Stuart, Beam, Sqreen investors/acquisitions) and deep technical roles from Ruby and Swift backends to system-level Rust work. Fabien combines hands-on implementation—E2EE APIs, encryption libraries, and full-stack rewrites—with product leadership as a former CTO and founder (Kard, CONOVAE, LinuxFr). He has a knack for making complex runtime and indexing problems tractable, often optimizing for single-machine speed and developer ergonomics. Based in the United States, he blends pragmatic engineering with a history of shipping secure, scalable systems across web, mobile, and blockchain domains.
16 years of coding experience
7 years of employment as a software developer
Master Computer science, Master Computer science at IFSIC
English, French
Stackoverflow
341reputation
51kreached
2answers
2questions
Github Skills (200)
postgresql10
compile-time10
python10
websocket10
telegram10
cryptocurrency10
smart-contracts10
whatsapp10
relay10
ai-agent10
async10
webapp10
sql10
telegram-bot10
rust10
Programming languages (14)
Github contributions (5)
penso/blog.penso.info
Mar 2015 - Oct 2020
My Jekyll code for my blog available at http://blog.penso.info
Contributions:29 pushes in 5 years 7 months
jekyll
penso/kickstart.nvim
Aug 2023 - Dec 2025
My neovim configuration based from kickstart.nvim
Contributions:2 PRs, 113 pushes, 2 branches in 2 years 5 months
nvim
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