Leaf Petersen
Senior Staff Software Engineer at Google
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolLeaf Petersen is a Senior Staff Software Engineer and technical lead at Google with 12+ years of industry experience, currently driving the evolution of the Dart language and managing the Dart Analyzer team. He combines deep research pedigree (PhD in Computer Science from Carnegie Mellon) and a decade at Intel with hands-on engineering to ship compiler, VM, and static-analysis features used by the broader Dart ecosystem. An active contributor to high-profile open-source projects like the Dart SDK and AngularDart, his work emphasizes language design, core libraries, and rigorous test automation—including adding tests for new language features and resolving complex type-inference and analyzer issues. Based in Seattle, he balances leadership of large engineering efforts with detailed contributions to compiler and tooling correctness, making him equally comfortable in strategic and implementation roles.
12 years of coding experience
9 years of employment as a software developer
PhD, Computer Science, PhD, Computer Science at Carnegie Mellon UniversityBA, Computer Science, BA, Computer Science at Williams College
English, Spanish
Stackoverflow
141reputation
3kreached
4answers
0questions
Github Skills (18)
develop10
testing10
web-framework10
dart10
angular10
test-automation10
programming-language9
sdk9
type-system9
language-features8
code-optimization8
flutter6
dart-analyzer6
oop6
algorithm4
Programming languages (5)
Github contributions (5)
dart-lang/sdk
Mar 2014 - Oct 2022
The Dart SDK, including the VM, JS and Wasm compilers, analysis, core libraries, and more.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:382 commits, 3 PRs, 101 pushes in 8 years 9 months
Contributions summary:Leaf's commits primarily involve developing and testing features within the Dart SDK, specifically focusing on the Dart language and its core libraries. This includes adding tests for new language features like static extension methods and operators, as well as fixing bugs in existing tests for generic functions and extension method resolution. The user has made significant contributions to the test suite, demonstrating a strong understanding of the Dart language and its associated testing frameworks. The user's work also encompasses addressing issues in the core libraries, ensuring the continued reliability and performance of the SDK.
dartsdkdart2jscore-librariesflutter
angulardart/angular
Jul 2016 - Jul 2018
Fast and productive web framework provided by Dart
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:5 commits, 3 comments in 2 years
Contributions summary:Leaf primarily contributed to the Dart-based Angular framework. Their work focused on addressing strong mode issues in metadata lists, ensuring correct type inference and preventing cast failures. They also resolved issues related to generic function usage, adapting code to align with future analyzer updates. Furthermore, the user made adjustments to both the base and mock application ref classes to accommodate changes from the SDK rollout.
dartframeworkweb-frameworkproductive
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