Kohei Tokunaga
Software Engineer at NTT
Japan
Summary
🤩
Rockstar🎓
Top SchoolKohei Tokunaga is a software engineer based in Japan with seven years of experience building and improving cloud-native container tooling. At NTT he focuses on backend and DevOps work, contributing substantial patches to high-profile open-source projects like containerd, buildkit and the stargz-snapshotter to enable remote snapshotting, faster image distribution, and robust registry/auth flows. He has a strong automation and build/devops bent—adding Docker buildx and emscripten support to container2wasm and improving nerdctl with GPU, volume propagation, and auth enhancements. His contributions span core runtime changes, integration tests, and configuration-friendly refactors, showing comfort touching both critical runtime code and surrounding infrastructure. A Tohoku University master's graduate, he combines academic rigor with pragmatic engineering, often improving performance and reliability in subtle but impactful ways.
7 years of coding experience
3 years of employment as a software developer
Master's degree, Graduate School of Information Sciences, Master's degree, Graduate School of Information Sciences at 東北大学
Github Skills (28)
filesystem10
container10
docker10
buildkite10
back-end-development10
apidoc10
testing10
snap10
user-authentication10
authentication10
dockers10
cicd10
snapshots10
containerd10
go10
Programming languages (9)
Github contributions (5)
container2wasm/container2wasm
Feb 2023 - Mar 2023
Container to WASM converter
Role in this project:
DevOps Engineer & Automation Engineer
DevOps Engineer & Automation EngineerContributions:106 reviews, 38 commits, 491 PRs in 17 days
Contributions summary:Kohei primarily focused on enhancing the project's build and deployment process. They introduced support for Docker builds and the use of buildx for more efficient containerization. Their contributions include adding features to use Docker build in the build process and enable features for emscripten builds. Further contributions include adjustments to the guest OS utilized by the software.
containersdockerwasmwebassembly
containerd/stargz-snapshotter
Oct 2019 - Jan 2023
Fast container image distribution plugin with lazy pulling
Role in this project:Back-end Developer
Back-end DeveloperContributions:422 reviews, 840 commits, 1698 PRs in 3 years 4 months
Contributions summary:Kohei primarily worked on modifying and refactoring the `stargz-snapshotter` project, focusing on enhancing its capabilities and addressing configuration-related aspects. They updated plugin IDs to be more configuration-friendly, added support for HTTPS registries and insecure registry configurations, and refactored demo codes. Their work also included refactoring and adding features for handling authentication with different credential configurations.
containerscontainerddocker-imagedockerfilesystem
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