Seiichi Uchida
Software Engineer at DeNA
Tokyo, Japan
Summary
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Rockstar🎓
Top SchoolSeiichi Uchida is a software engineer based in Tokyo with nine years of experience building game platform tooling, BaaS infrastructure, and developer utilities at DeNA. He works across C++, Go, Java and Qt, and currently focuses on tooling for game engines while previously contributing to SDKs and cloud services on GCP. An active open-source maintainer and rustfmt working group leader, he contributes to high-profile Rust projects such as rustfmt, clippy, crossbeam and Glommio—improving concurrency primitives, performance, and correctness. His open-source work shows a knack for low-level concurrency fixes and memory-safety improvements (e.g., addressing race conditions, iterator ordering, and memory leaks in skiplist and async executor code). Colleagues rely on him for pragmatic refactors that increase reliability and maintainability across languages and runtimes.
9 years of coding experience
University of Tokyo
Stackoverflow
379reputation
13kreached
5answers
1question
Github Skills (25)
algorithm10
algorithms10
async10
testing10
memory-management10
data-structure10
code-analysis10
go10
thread10
synchronization10
data-structures10
linting10
lock-free10
rust10
concurrency10
Programming languages (14)
Github contributions (5)
rust-lang/rustfmt
May 2017 - Sep 2020
Format Rust code
Role in this project:
Back-end Developer
Back-end DeveloperContributions:24 releases, 10 reviews, 130 commits in 3 years 4 months
Contributions summary:Seiichi was primarily focused on formatting and standardizing Rust code within the `rustfmt-rustfmt` repository. The commits show consistent application of code formatting and linting, indicating a focus on code style and maintainability. Their contributions involved making general code improvements, updating tests, and addressing code-formatting-related issues, with a particular focus on import statements and match expressions.
rustcodeformatterformatterrustfmt
crossbeam-rs/crossbeam
Feb 2019 - Aug 2021
Tools for concurrent programming in Rust
Role in this project:Backend Developer
Backend DeveloperContributions:1 review, 17 commits, 6 PRs in 2 years 6 months
Contributions summary:Seiichi primarily contributed to the `crossbeam-skiplist` crate, focusing on improvements to concurrent programming tools in Rust. Their work involved refactoring code related to `RefEntry` and `Entry` structs, including implementing and optimizing reference counting and memory management using `ManuallyDrop`. Key changes involved addressing memory leaks within the skiplist implementation and ensuring proper thread pinning and guard usage. Additionally, the user addressed iterator ordering and added tests to detect and prevent potential memory issues.
concurrentmultithreadingconcurrent-programmingconcurrencysynchronization
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