Frédéric Sagnes
Senior Engineering Manager, VS Code DevEx & AI Coding Assistants at Meta
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolFrédéric Sagnes is a senior engineering leader based in London with 16+ years of experience building developer tools, programming languages and high-performance mobile platforms. At Meta he scaled and led multi-site teams (30→64, 60+ people) to ship company-wide VS Code developer experience and AI coding assistants that became a primary source of AI-generated code and significantly reduced keystrokes and build times. He previously drove React Native performance and helped create the Hermes JS VM, and contributed performance and image-loading optimizations to the widely used react-native iOS codebase. His work combines hands-on systems and mobile expertise with org-scale initiatives—accelerating code search, automated codemods, and large-scale refactorings that improved developer productivity and sentiment. Known for growing teams across sites, mentoring managers, and translating deep technical challenges into measurable developer impact. An early maker of mobile and embedded systems, he still blends low-level optimization instincts with product-focused engineering leadership.
16 years of coding experience
13 years of employment as a software developer
Master Computer Science, Master Computer Science at ISIMA
French, English, German
Github Skills (10)
objective-c10
javascript10
ios10
mobile-development10
react-native10
performance-optimization10
testing10
app-framework9
cross-platform9
image-loading8
Programming languages (10)
Github contributions (5)
facebook/react-native
Jul 2015 - Nov 2015
A framework for building native applications using React
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:5 commits, 3 comments in 4 months
Contributions summary:Frédéric primarily focused on improving performance and implementing features related to the React Native iOS framework. They optimized test performance by modifying allocation tests and context executor tests. Additionally, they implemented cancellation functionality for image loading within the RCTAssetsLibraryImageLoader. Furthermore, the user optimized the javascript loading performance by modifying how the javascript bundle is loaded.
reactnative-applicationsmobile-developmentreact-nativeandroid
ndfred/unifi-pi-hole
Apr 2019 - Dec 2020
Contributions:11 releases, 37 commits, 36 pushes in 1 year 8 months
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