Joyee Cheung
Summary
🤩
Rockstar
Top expert inFull-stack JavaScript Development
Joyee Cheung is a software engineer with 12 years of experience specializing in JavaScript runtime and engine internals, currently consulting at Igalia to improve Node.js and V8 stability, performance, and developer experience. A long-time Node.js contributor and governance member (CTC/TSC since 2017) and V8 committer since 2019, she blends deep C++ backend work with JavaScript language feature implementation and tooling. Her contributions touch high-profile projects like V8 and the tc39/test262 conformance suite, plus practical debugging tools such as llnode for inspecting Node/V8 core dumps. Joyee has hands-on production experience from Alibaba Cloud, maintaining custom Node builds, monitoring/profiling platforms and serverless integrations. She regularly triages vulnerabilities, improves build/toolchain portability, and influences ECMA TC39 as an implementer and embedder. Based in A Coruña, she also shares insights through talks and a technical blog, often surfacing subtle spec and engine edge cases that improve real-world Node.js behavior.
13 years of coding experience
Github Skills (25)
debugging10
javascript10
c-language10
testing10
v810
virtual-machine10
interpreter10
lldb10
header-files10
compiler-compiler10
compiler10
nodejs10
cprogramming-language10
ecmascript10
build-system9
Programming languages (15)
Github contributions (5)
nodejs/llnode
Jan 2017 - Jul 2018
An lldb plugin for Node.js and V8, which enables inspection of JavaScript states for insights into Node.js processes and their core dumps.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:3 releases, 1 review, 37 commits in 1 year 5 months
Contributions summary:Joyee's contributions primarily involved extending the functionality of the `llnode` plugin. They implemented the `--array-length` option for inspecting large arrays, and added support for reading contents from buffers, array buffers, and typed arrays. They also added features such as supporting thin strings, stub frames, and fixed issues with backtraces in V8. These improvements were accompanied by unit tests to ensure the correct functionality of the changes.
coredumpjavascriptlldbnodejsnode
ayojs/ayo
Oct 2017 - Oct 2017
A fork of Node.js. Humans before technology.
Role in this project:Back-end Developer
Back-end DeveloperContributions:11 commits in 24 days
Contributions summary:Joyee primarily contributed to the Node.js codebase, focusing on internal header file improvements, and code refactoring to reduce includes and improve maintainability. Their work involved modifying core files like `node_crypto_clienthello-inl.h`, and `node_crypto.h`, ensuring files were self-contained, and adjusting include statements. The contributions are focused on the C++ backend of Node.js, fixing issues and improving the build process.
nodejsayojavascript
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