Kazuki Matsuda
Software Engineer at Gen-AX株式会社
Chiyoda, Japan
Summary
🤩
Rockstar🎓
Top SchoolKazuki Matsuda is a seasoned software engineer with 12 years of experience building backend systems and APIs, currently based in Chiyoda, Japan and working at Gen-AX株式会社. He has deep Go and Java expertise, having modernized core components of the widely used git-lfs project and contributed notable enhancements to LINE’s Java Bot SDK. His career includes senior engineering and technical leadership roles at LINE and Cluster, where he led server-side teams for large-scale commerce and messaging services across microservice landscapes. Kazuki combines product sensibility (former product owner experience) with strong engineering craftsmanship—refactoring for efficiency, cross-platform support, and careful timestamp/serialization handling. Trained originally in astrophysics, he brings a research-driven, analytical mindset to complex engineering problems and a quiet persistence reflected by continuous open-source contributions.
11 years of coding experience
12 years of employment as a software developer
Bachelor, Astrophysics, Bachelor, Astrophysics at Kyoto University
Github Skills (19)
git10
filesystem10
apidoc10
file-operations10
git-lfs10
java10
javas10
go10
api10
jackson10
fileio10
java-time10
java-api10
spring-boot9
lombok9
Programming languages (13)
Github contributions (5)
line/line-bot-sdk-java
Sep 2016 - Oct 2020
LINE Messaging API SDK for Java
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 releases, 14 reviews, 372 commits in 4 years 1 month
Contributions summary:Kazuki primarily focused on enhancing the Java SDK for the LINE Messaging API. Their contributions included implementing Java time instant deserialization using Jackson, refactoring code for improved Lombok usage, and converting `commons-io` to Guava. The user also addressed timestamp handling within the code base and performed minor refactoring tasks.
apiapi-sdkbotline-messaging-apisdk
git-lfs/git-lfs
Jul 2019 - Aug 2019
Git extension for versioning large files
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 9 PRs, 25 comments in 1 month
Contributions summary:Kazuki primarily contributed to the Git LFS project by implementing and improving the underlying functionality for large file storage. They updated the code to use modern Go idioms and refactored file operations for improved efficiency. The user added a new command for file system level deduplication, enhancing the project's core capabilities. They also introduced platform-specific code for file cloning on macOS and Windows, expanding the system's cross-platform compatibility.
git-extensionversion-controllibgit2git-addonsversioning
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