Julien Letessier
Product Engineer at Peanut
Grenoble, Auvergne-Rhône-Alpes, France
Summary
👤
Senior🎓
Top SchoolJulien Letessier is a veteran product engineer and technology leader with 14+ years building scalable backends, distributed systems, and high-growth engineering teams across European startups. He has led architecture and platform evolution at hyper-growth companies (Deliveroo, HouseTrip) and served as CTO/Head of Engineering at Peanut, combining hands-on coding with people and product leadership. Comfortable across Ruby, Go, Rust, Node.js and Python, he designs resilient, event-driven systems and practical developer tooling that reduce technical debt and accelerate delivery. Currently contributing as a full-stack product engineer at FetLife, he balances privacy-sensitive social product work with platform-level reliability. A former founder and INRIA research engineer with a PhD background, Julien brings uncommon depth in computer vision, systems architecture and operational leadership. Based in Grenoble and 80% remote, he prefers telework-friendly, high-growth funded companies where he can be both an individual contributor and a strategic engineering coach.
14 years of coding experience
15 years of employment as a software developer
Master Computer science & engineering, Master Computer science & engineering at National School of Computer Science and Applied Mathematics of GrenoblePhD Computer science, PhD Computer science at Grenoble INP - UGALycée Chateaubriand
French, English, Spanish
Stackoverflow
379reputation
69kreached
7answers
0questions
Github Skills (199)
fuzzy10
dispatcher10
string-matching10
matching10
activesupport10
conventions10
bus10
mongoid10
url-parser10
activemodel10
searching10
rack-middleware10
cache-control10
cqrs9
hanami9
Programming languages (9)
Github contributions (5)
HouseTrip/km-db
Feb 2012 - Sep 2014
Contributions:120 commits, 1 comment in 2 years 7 months
data-dumpsdumpskissmetrics
deliveroo/routemaster-client
Apr 2014 - Aug 2017
Ruby client API for the Routemaster event bus
Contributions:140 commits, 33 PRs, 72 pushes in 3 years 4 months
api-clientapirailsruby-clientruby
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