Yuji Kanagawa
Iwata, Shizuoka Prefecture, Japan
Summary
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Rockstar🎓
Top SchoolYuji Kanagawa is a backend-focused software engineer with a decade of experience specializing in Rust and Python interoperability, particularly through contributions to high-profile projects like PyO3, rust-numpy, racer, and the Rust Language Server. He has deep experience implementing type conversions, memory-safe bindings, and improving developer tooling—work that ranges from adding 128-bit integer support and PyArray integrations to refining code completion and project-model behaviors in RLS. Trained at the University of Tokyo with further study at OIST, he combines rigorous academic grounding with practical open-source impact. Based in Iwata, Shizuoka, he’s comfortable navigating low-level pointer and CI/test complexities while also shipping user-facing improvements that make language tooling and numeric bindings more reliable. An understated strength is his attention to tests and CI hygiene, which helped stabilize examples and regression workflows across multiple repositories.
10 years of coding experience
沖縄科学技術大学院大学（OIST）Bachelor of Arts and Science, Department of Interdisciplinary Sciences, College of Arts and Sciences, Bachelor of Arts and Science, Department of Interdisciplinary Sciences, College of Arts and Sciences at 東京大学
Stackoverflow
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Github Skills (22)
type-inference10
python10
typed-array10
multidimensional-arrays10
cname10
testing10
ide10
pyo10
dynamic-array10
arrayobject10
language-server-protocol10
ndarray10
numpy10
parsing10
parse10
Programming languages (15)
Github contributions (5)
racer-rust/racer
Jan 2018 - Apr 2021
Rust Code Completion utility
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 releases, 21 reviews, 469 commits in 3 years 3 months
Contributions summary:Yuji contributed to the development and maintenance of the Rust Code Completion utility "racer". Their work primarily involved implementing and refining core features such as code parsing, type inference, and name resolution. The commits demonstrate a focus on improving the accuracy of the utility, with contributions including fixes for issues related to comments, string literals, and macro completion. The user also added tests to ensure that these improvements were implemented correctly.
rustcode-completioncompletion
PyO3/rust-numpy
Jul 2018 - Mar 2022
PyO3-based Rust bindings of the NumPy C-API
Role in this project:Back-end Developer
Back-end DeveloperContributions:16 releases, 101 reviews, 355 commits in 3 years 9 months
Contributions summary:Yuji primarily contributed to the development of the `rust-numpy` library, focusing on integrating the project with the PyO3 interface. Their work involved adding and modifying the `PyArray_Type_Global` and using pointers for global scope to avoid copying the type. They also added various methods to create, manipulate, and convert NumPy arrays from different Rust data structures and fixed examples to ensure proper functionality. Furthermore, the user added unit tests for the created methods and made adjustments to the testing and building CI setup.
apirust-ndarraynumpy-capindarrayrust-numpy
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