Julien E
Protocol Developer at Cardano Foundation
France
Summary
🤩
Rockstar🎓
Top SchoolJulien E is a protocol developer with 15 years of engineering experience and a decade-long focus in blockchain and decentralized systems since 2017. He has led technical teams and products at Parity and Status, built web-native substrate tooling and governance dashboards, and lately works on Cardano's Rust node ledger while previously contributing to Ethereum light-client work at ChainSafe. A pragmatic polyglot, Julien blends low-level Rust and nodejs performance work with front-end and mobile ClojureScript/React Native contributions, including visible fixes to the widely used ClojureScript compiler and Garden CSS tooling. He founded and shipped an audio platform using Rust, WASM and CRDTs that targets microcontrollers, desktop and VST plugins, showing a taste for real‑time distributed systems beyond typical blockchain stacks. Known for maintaining API stability (e.g., rolling back breaking changes in Mule) and shipping production-ready platforms, he balances architecture, hands-on implementation and open-source collaboration. Based in France, he brings a mix of developer leadership, cross-stack craftsmanship and a track record of shipping decentralized, offline-first and high-performance systems.
15 years of coding experience
15 years of employment as a software developer
Master, Master at CY Tech
French, English, Spanish
Github Skills (38)
react-native10
mobile-development10
mule10
integrate10
clojure-cli10
annotations10
compiler-development10
integrations10
java10
annotation-processing10
clojure10
javas10
react10
clojurescript10
text-manipulation9
Programming languages (18)
Github contributions (5)
status-im/status-legacy
May 2017 - Jul 2019
a free (libre) open source, mobile OS for Ethereum
Role in this project:
Full-stack Mobile Developer
Full-stack Mobile DeveloperContributions:221 commits, 467 PRs, 888 pushes in 2 years 2 months
Contributions summary:Julien primarily contributed to the front-end development of the Status mobile application, working with React Native. Their commits focused on implementing new UI components, adding features, and fixing bugs within the application's various screens, including chat, profile, and wallet-related features. The changes involved modifications to ClojureScript code and related configurations.
ethereummobilemessengerblockchainwallet
noprompt/garden
Sep 2013 - Feb 2015
Generate CSS with Clojure
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:26 commits, 2 PRs, 1 push in 1 year 5 months
Contributions summary:Julien primarily focused on adding ClojureScript support to the garden project, a CSS compiler. They implemented initial ClojureScript integration, which involved changes to compiler files and unit tests. Further contributions included fixing ClojureScript-related issues, adjusting type usage, and optimizing the code for ClojureScript.
clojurecssclojurescriptcss-compiler
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