Yuta Saito
Compiler Toolchain Engineer at Goodnotes
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolYuta Saito is a Compiler Toolchain Engineer based in Tokyo with a decade of experience building language runtimes, toolchains, and cross-platform systems, currently leading WebAssembly support for Swift and Ruby. He combines deep compiler and runtime work—contributing to swift, swift-package-manager, and ruby—with practical build and DevOps fixes in projects like RubyGems to enable cross-compilation and WASI support. His background includes product-facing porting of a Swift app via SwiftWasm at GoodNotes and compiler ecosystem internships at Apple and Mercari, giving him both applied and systems-level perspectives. An active OSS maintainer, he has hands-on experience resolving platform-specific test failures, enhancing package tooling, and improving JSON and serialization behavior in core libraries. Notably, he bridges language development and developer tooling, having improved Xcode project generation, Swift static analysis, and Swift-WASM integration across major projects.
10 years of coding experience
6 years of employment as a software developer
Master's degree, CS, Master's degree, CS at 早稲田大学 WASEDA UniversityBachelor's degree, CS, Bachelor's degree, CS at WASEDA University
Github Skills (68)
parser10
package-management10
testing10
rust-wasm10
ruby10
package-manager-tool10
code-analysis10
specification10
encoding10
apple210
cross-compiling10
runtimes10
rubygems10
run-time10
data-serialization10
Programming languages (20)
Github contributions (5)
swiftlang/swift
Oct 2019 - Dec 2022
The Swift Programming Language
Role in this project:
Back-end & System Engineer
Back-end & System EngineerContributions:116 reviews, 725 commits, 401 PRs in 3 years 2 months
Contributions summary:Yuta primarily focused on improving the Swift compiler's code generation and runtime, specifically targeting WebAssembly. Their contributions include fixing bugs related to WebAssembly tests, addressing signature mismatches in distributed actor implementations, and resolving build issues for 32-bit non-Darwin builds. They also worked on wasm-related features such as autolink, metadata registration, and attribute support.
swift-programmingswift-programming-languageprogramming-languageswift
swiftlang/swift-corelibs-foundation
Apr 2019 - Aug 2021
The Foundation Project, providing core utilities, internationalization, and OS independence
Role in this project:Back-end Developer
Back-end DeveloperContributions:20 reviews, 6 commits, 93 PRs in 2 years 4 months
Contributions summary:Yuta primarily focused on modifying the core foundation of the project by improving JSON encoding and decoding strategies, particularly by converting snake_case keys. They made several changes to the JSONEncoder and JSONDecoder in Foundation, adding new test cases to ensure the correct implementation of these strategies. The user also imported key-coding strategy changes, showing an understanding of and contribution to, core data serialization components.
tvostranslationinternationalizationfoundationindependence
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