Mathias Berger-fruhinsholz
Founder CEO at Stealth
France
Summary
🤩
Rockstar🎓
Top SchoolMathias Berger-fruhinsholz is a founder and hands-on software engineer based in San Francisco with five years of experience building resilient, cross-platform systems and shipping product-focused features. He has deep practical experience in peer-to-peer, offline-first networking and mobile drivers from his work on the open-source Berty messenger, where he improved cross-platform logging and connectivity drivers for Android and iOS. Mathias has contributed full‑stack fixes and language-server integrations to high-performance projects like Zed, and has built production Kotlin NFC tooling, Svelte editors, and AI-powered search at startups. Now leading his own stealth venture after a string of founding and early-engineer roles, he combines low-level systems insight (Go, native mobile) with frontend polish and rapid prototyping. A graduate of 42 Nice and a Y Combinator founder alumnus, he pairs entrepreneurial grit with an unusual attention to observability and network-aware optimization.
5 years of coding experience
2 years of employment as a software developer
F25, F25 at Y CombinatorMaster's Degree, Computer Science, Master's Degree, Computer Science at 42 Nice
French, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (26)
javascript10
ios10
typescript10
language-server-protocol10
java10
mobile-application10
javas10
language-server10
go10
gpu10
android10
typescript-types10
swift10
logging10
typescripts10
Programming languages (12)
Github contributions (5)
zed-industries/zed
May 2024 - Nov 2024
Code at the speed of thought – Zed is a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:5 reviews, 9 PRs, 26 comments in 6 months
Contributions summary:Mathias primarily contributed to the Zed code editor by fixing bugs and implementing features related to language server integrations, specifically for Svelte and JavaScript/TypeScript. Their work involved addressing formatting issues, enabling inlay hints, and updating language grammars. Additionally, the user made contributions to the project panel, improving its behavior regarding folder expansion when dragging and dropping.
gpuirust-langtext-editorzed
berty/berty
Dec 2022 - Jan 2023
Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network
Role in this project:Mobile Developer (Android/iOS)
Mobile Developer (Android/iOS)Contributions:1 review, 5 commits, 13 PRs in 25 days
Contributions summary:Mathias primarily focused on enhancing the logging functionality within the Berty application across various platforms, including iOS and Android. Their contributions involved modifying log levels, adjusting log formatting, and integrating native logging capabilities specific to each operating system. They updated the BertyLogger class in Swift and Java to improve the way logs are managed and displayed. Additionally, the user implemented a new ConnectivityDriver, providing detailed connectivity information, including network and Bluetooth status, for both Android and iOS.
censorshipsurveillancemobile-apppeer-to-peerios
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