Tsubasa Nagasawa
SRE at 株式会社スリーシェイク
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolTsubasa Nagasawa is an SRE based in Tokyo with eight years of experience building and operating large-scale Kubernetes platforms for mobile game companies. He specializes in scalable distributed systems, test automation, and developer experience, having contributed e2e test suites to the Knative client and Rust/Wasm bindings for JavaScript Date interoperability. His career spans SRE and infrastructure roles at major Japanese firms including COLOPL and CyberAgent, where he focused on reliability and automation in production environments. Known for pragmatic engineering, he combines a physicist’s analytical rigor (Master’s from Kyushu University) with a “lazy but efficient” coding ethos that favors automation and maintainability. Comfortable across Go, Kubernetes, and backend systems, he brings practical open-source contributions to improve developer workflows and system robustness.
8 years of coding experience
1 year of employment as a software developer
Master's degree, 物理学, Master's degree, 物理学 at 九州大学
Github Skills (16)
bind10
wasm-bindgen10
binding10
testing10
e2e-testing10
javascript10
generator10
go10
rust10
rust-wasm10
e2e-test10
clientside9
kubernetes-pods9
cli9
webclient9
Programming languages (16)
Github contributions (5)
knative/client
Jul 2019 - Sep 2019
Knative developer experience, docs, reference Knative CLI implementation
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:8 commits, 7 PRs, 78 comments in 2 months
Contributions summary:Tsubasa's contributions primarily involve the creation and modification of end-to-end (e2e) tests for the Knative client, specifically focusing on service creation, updates, and revision management with various options like concurrency limits. They refactored and cleaned up existing test assertions, utilizing the `gotest.tools/assert` package and subtests for improved error spotting. The user demonstrated expertise in test implementation, including writing and modifying test cases, and in utilizing testing frameworks and tools.
serverlessknativekubernetesdeveloper-experiencecli
rustwasm/wasm-bindgen
Jul 2018 - Jul 2018
Facilitating high-level interactions between Wasm modules and JavaScript
Role in this project:Back-end Developer
Back-end DeveloperContributions:23 commits, 7 PRs, 8 comments in 16 days
Contributions summary:Tsubasa primarily contributed to the development of bindings for JavaScript's Date object within a Rust/Wasm environment. Their work involved adding methods for retrieving various date components like day, year, hours, and milliseconds, as well as implementing static methods like `parse`. These additions enhance the project's ability to interact with JavaScript's Date functionality from within WebAssembly modules. Furthermore, the user updated related tests to ensure the bindings function correctly.
rustbinding-generatorjavascripthigh-levelasmjs
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