Robert Chatham
Senior System Engineer at Cloudflare
Scotts Valley, California, United States
Summary
🤩
Rockstar🎓
Top SchoolRobert Chatham is a Senior System Engineer with 11 years of experience building and hardening back-end and systems infrastructure, currently at Cloudflare in Scotts Valley. He brings deep expertise in WebAssembly and Emscripten tooling—demonstrated by substantive contributions to rust-lang, emscripten, pyodide and multiple scientific Python projects to ensure cross-compilation and runtime correctness. His work spans runtime internals, compiler build systems, and full-stack integrations, from modifying Rust compiler targets to adding builtin Wasm modules for Cloudflare’s workerd. Before industry roles he earned a PhD in Mathematics from MIT and taught homotopy theory at UCLA, a background that informs his methodical approach to complex systems and rigorous testing. Robert is an active open-source maintainer across high-profile projects (CPython, NumPy, SciPy, matplotlib) where he focuses on signatures, ABI compatibility, and test automation—helping projects run reliably on emerging platforms. He combines academic depth with practical engineering, often tackling subtle platform-specific bugs that others miss.
11 years of coding experience
3 years of employment as a software developer
Bachelor of Arts - BA, Mathematics, Bachelor of Arts - BA, Mathematics at University of California, BerkeleyPhD, Mathematics, PhD, Mathematics at Massachusetts Institute of Technology
Github Skills (63)
debug10
filesystem10
javascript10
scipy10
c-language10
jquery10
python10
capnproto10
compiler-development10
testing10
matplotlib10
terminal-emulator10
build-system10
c1110
terminal-application10
Programming languages (20)
Github contributions (5)
pyodide/pyodide
Dec 2020 - Jan 2023
Pyodide is a Python distribution for the browser and Node.js based on WebAssembly
Role in this project:
Back-end Developer & Build/Release Engineer
Back-end Developer & Build/Release EngineerContributions:2022 reviews, 882 commits, 2570 PRs in 2 years 1 month
Contributions summary:Robert primarily worked on enhancements and fixes related to the Pyodide build system. Their contributions involved refactoring the build process, including the addition of features to facilitate dynamic linking and support for JavaScript Promise Integration. They also streamlined the build process and improved documentation and error handling. The user's work also included adding a new tool to automate some of the steps of an Emscripten update.
pythonbrowsernode-jspyodidewebassembly
cloudflare/workerd
Nov 2023 - Apr 2025
The JavaScript / Wasm runtime that powers Cloudflare Workers
Role in this project:Back-end Developer
Back-end DeveloperContributions:494 reviews, 226 PRs, 626 pushes in 1 year 4 months
Contributions summary:Robert primarily worked on modifying the `autogate` functionality within the `workerd` runtime environment. They moved the definition of the `Autogate` struct into a separate Cap'n Proto file and integrated it within the server configuration, enhancing initialization and addressing potential initialization issues. The user further contributed to the creation of internal builtin modules, specifically to accommodate WebAssembly modules, for integration with projects like Pyodide, and also adding support for builtin data modules. These contributions suggest a focus on core runtime infrastructure and module management.
cloudflarejavascriptpowersruntimeservice-worker
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.