Rintaro Ishizaki
Software Engineer at Apple
San Francisco, California, United States
Summary
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Rockstar🎓
Top SchoolRintaro Ishizaki is a seasoned software engineer based in San Francisco with 10 years of experience building and modernizing language tooling and core libraries, currently contributing at Apple. He has a strong systems and backend focus shown by significant open-source work on Swift (compiler, syntax, corelibs, libdispatch) and contributions to Google's Closure Compiler, improving parsing, memory-safety patterns, and code-completion test automation. Comfortable across QA, full-stack, and backend roles, he pairs deep language-level expertise with practical test automation and refactoring skills that reduce technical debt. His background in architectural CAD/CADD hints at a practiced eye for precise, maintainable systems design, and his open-source commits demonstrate a preference for robust parsing, memory-layout modernization, and developer-facing tooling improvements.
10 years of coding experience
11 years of employment as a software developer
Bachelor of Engineering in Architecture, Architectural Drafting and Architectural CAD/CADD, Bachelor of Engineering in Architecture, Architectural Drafting and Architectural CAD/CADD at Nihon University
Stackoverflow
51,681reputation
3.7mreached
502answers
13questions
refresh
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uilabel
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Github Skills (65)
parser10
testing10
code-completion10
lexical-analysis10
optimization10
javascript10
memory-management10
google-closure-compiler10
enums10
ast-parser10
swift10
text-parsing10
test-automation10
closure10
json10
Programming languages (11)
Github contributions (5)
swiftlang/swift
May 2022 - Jan 2023
The Swift Programming Language
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1147 reviews, 42 commits, 2603 PRs in 8 months
Contributions summary:Rintaro primarily focused on the Swift programming language, working on core language features within the `swiftlang/swift` repository, a project focused on the Swift Programming Language. The commits indicate contributions to Swift's IDE features, especially focusing on macro expansion. The user's work involved modifying the parser, handling attributes, and integrating SwiftSyntax for improved parsing and code completion capabilities.
swift-programmingswift-programming-languageprogramming-languageswift
swiftlang/swift-syntax
Nov 2017 - Nov 2022
A set of Swift libraries for parsing, inspecting, generating, and transforming Swift source code.
Role in this project:Back-end Developer
Back-end DeveloperContributions:436 reviews, 136 commits, 385 PRs in 5 years
Contributions summary:Rintaro primarily contributed to the Swift-Syntax library by introducing new trivia kinds and functionality for parsing Swift source code. They added features such as parsing hashbangs, carriage returns, and the handling of missing optional nodes. They also implemented debugging tools to handle JSON decode failures during the parsing process. Further, the user refactored and optimized the codebase, contributing to its internal structure and efficiency.
bazelswiftbazel-rulesparsing
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