Jonah Williams
Principal Software Engineer at Roblox
California, United States
Summary
🤩
Rockstar🎓
Top SchoolJonah Williams is a Principal Software Engineer with 11 years of experience, now at Roblox after nearly a decade at Google where he led graphics and rendering work on Flutter’s Impeller engine. He combines deep systems and graphics expertise—optimizing rendering, memory, and shaders—with practical mobile engineering, contributing Android fixes to widely used Flutter packages like image_picker and url_launcher. Jonah’s contributions span the Dart SDK, Flutter engine, DevTools, and popular open-source apps, showing strength across back-end, full-stack, and front-end concerns. He’s comfortable refactoring core systems (e.g., splitting frontend_server for JS compilation) and squeezing performance wins through careful memory and data-path improvements. Based in California, he pairs academic rigor from a mathematics degree with product-focused engineering that improves both developer tooling and end-user performance. Outside work he signals a playful, independent streak—his GitHub bio reads “Rock, Flag, and Eagle”—hinting at a personality that balances precision with personality.
11 years of coding experience
11 years of employment as a software developer
Bachelor's Degree Mathematics, Bachelor's Degree Mathematics at University of Nebraska at Omaha
Stackoverflow
20,985reputation
2.2mreached
129answers
1question
firebase
top-1%
if-statement
top-1%
dictionary
top-5%
javascript
top-5%
async-await
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google-cloud-firestore
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Github Skills (58)
data-visualizations10
vulkan10
google-cloud-firestore10
c-language10
develop10
flutter-apps10
permission10
testing10
memory-management10
http10
data-visualisation10
ui-design10
android-development10
navbar10
java10
Programming languages (12)
Github contributions (5)
flutter-team-archive/engine
Mar 2018 - Jan 2023
The Flutter engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3746 reviews, 269 commits, 1602 PRs in 4 years 11 months
Contributions summary:Jonah's contributions focused on the Impeller engine, a rendering engine. Their work included optimizing code, fixing memory leaks, and refactoring core systems. They modified shaders, implemented fixes related to texture and image uploads, and enhanced the management of command buffers and memory allocation. The commits demonstrate a strong focus on improving the performance and stability of the rendering engine.
flutter-enginec-plus-plus
flutter/flutter
Mar 2018 - Jan 2023
Flutter makes it easy and fast to build beautiful apps for mobile and beyond
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:3957 reviews, 2138 commits, 5279 PRs in 4 years 11 months
Contributions summary:Jonah contributed to the `flutter/flutter` repository, specifically focusing on implementing and modifying UI-related components within the Impeller rendering backend. The commits involve deleting unused geometry APIs, refactoring the drawAtlas component to utilize the porterduff or vertices_uber shader, and deleting the points compute shader. Additionally, the user appears to have also been involved in optimizing rendering for the Android platform, working on issues relating to pixel precision and various optimizations around text rendering and the usage of texture.
fluttermobileandroidiosmaterial-design
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