Fabien Penso
Principal Engineer at Constellations
United States
Summary
👤
Senior🎓
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
24 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)
cosmos10
sqlx10
orm10
webapp10
monitor10
mysql10
responsive10
postgresql10
websocket10
sidekiq10
sql10
rust10
socket-io10
mariadb10
loco10
Programming languages (15)
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
my-blogjekyll
kard/omniauth-snapchat
Jan 2019 - Dec 2024
Contributions:1 push, 1 comment in 5 years 11 months
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