Sam Zhou
Software Engineer at Meta
Old Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolSam Zhou is a software engineer with 11 years of experience specializing in type systems and developer tooling, currently contributing to Flow, Facebook’s scalable JavaScript type checker. They have a strong open-source footprint across high-profile projects—Flow, Pyre, Recoil, Metro, Hermes, Relay, and React Native—where they drive type-safety improvements, build-system performance, and release engineering. Sam’s work spans front-end and back-end concerns, from Flow’s local type inference and conditional types to speeding Python build tooling and adding WASM support for tooling playgrounds. Notably, they’ve improved Flow library definitions (flow-typed) for widely used libraries like Firebase and enhanced react-redux typings, demonstrating attention to ecosystem usability. Based in Toronto and trained at Cornell, Sam enjoys tackling “undecidable problems,” bringing both deep theoretical instincts and practical engineering to large-scale codebases.
11 years of coding experience
4 years of employment as a software developer
Bachelor of Science - BS Computer Science, Bachelor of Science - BS Computer Science at Cornell University
English, Chinese
Github Skills (46)
parserator10
javascript10
parser10
static-analysis10
type-check10
react-native10
flow-control10
website-development10
python10
annotations10
react-redux10
work-flow10
typescript10
build-system10
relayer10
Programming languages (17)
Github contributions (5)
flow-typed/flow-typed
Feb 2019 - Oct 2022
A central repository for Flow library definitions
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:5 reviews, 3 commits, 24 PRs in 3 years 8 months
Contributions summary:Sam's commits primarily focused on adding and refining Flow type definitions for the Firebase library, specifically for firestore functionality. This involved updating existing definitions, adding missing ones, and ensuring consistency with the official TypeScript definitions. They also contributed to the react-redux typing definitions, introducing improvements for the useDispatch hook, including a type argument default. Additionally, the user addressed bugs and improved type coverage for various features, enhancing the library's usability and maintainability.
libdefsflowtypedefinitionscli
facebook/docusaurus
May 2019 - May 2021
Easy to maintain open source documentation websites.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:15 reviews, 55 commits, 62 PRs in 2 years
Contributions summary:Sam made several contributions focused on enhancing the Docusaurus documentation website. They addressed code style issues, implemented features such as tab choice syncing, and supported TypeScript theme components. The user also fixed routing problems and optimized the build process. The user's work touched upon frontend components and configuration files.
javascriptreact
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