Yusuke Tsutsumi
Distinguished Software Engineer at Open Source
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolYusuke Tsutsumi is a Distinguished Software Engineer with 15 years of experience building developer productivity, automation, and observability tooling across large organizations including Google, Zillow, Cruise/GM, and influential open-source projects. He specializes in removing manual pain from development cycles via automated testing, CI/CD, stability monitoring, and infrastructure-for-developers, with hands-on expertise in Python and C++ and deep work on Linux performance and ML observability. At Google he led cross-organizational API and declarative tooling efforts for GCP integrations, and at Cruise he drove multi-team performance and AV bringup initiatives that span kernel tracing to model runtime profiling. An active open-source maintainer, he contributes to high-profile projects like the Python Package Index backend, OpenTelemetry Python, and maintains aep.dev—guiding an industry consortium on API design for REST and gRPC. He combines technical leadership with prolific hands-on contributions, from refactoring core back-end services to authoring SDKs and documentation, and often surfaces practical tooling improvements that accelerate teams by orders of magnitude. Based in Seattle, he pairs formal training in engineering and mathematics with a knack for turning systemic developer friction into automated, reliable workflows.
14 years of coding experience
16 years of employment as a software developer
Bachelors Electrical Engineering Mathematics Physics, Bachelors Electrical Engineering Mathematics Physics at University of WashingtonMathematics Research, Mathematics Research at Tokyo Institute of Technology
English, Japanese
Github Skills (42)
build-time10
unit-testing10
nuget10
godot10
npm-registry10
pytest10
python10
apidoc10
setuptools10
distributed-tracing10
databases10
data-serialization10
buildx10
attr10
serialization10
Programming languages (22)
Github contributions (5)
open-telemetry/opentelemetry-python
Jul 2019 - Apr 2021
OpenTelemetry Python API and SDK
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2 releases, 136 reviews, 43 commits in 1 year 8 months
Contributions summary:Yusuke primarily contributed to the OpenTelemetry Python SDK, focusing on core API and SDK implementations related to the resource and propagator functionalities. They implemented the Resource API, including its creation, merging, and label management. The user also added the propagators API and b3 SDK implementation, including tests. Furthermore, the user introduced an example application instrumented with OpenTelemetry and added the W3C TraceContext support.
apicorrelationcontextpythontracecontexttracing
python-attrs/cattrs
Sep 2017 - Oct 2017
Composable custom class converters for attrs, dataclasses and friends.
Role in this project:Back-end Developer
Back-end DeveloperContributions:17 commits, 2 PRs, 9 comments in 23 days
Contributions summary:Yusuke primarily focused on enhancing the `cattrs` library by implementing new features and refactoring existing code. Their contributions involved adding function-based dispatch mechanisms, migrating to a combined strategy, and refactoring existing code. The user also addressed compatibility issues and incorporated unit tests to improve the library's robustness and maintainability. Additionally, they removed vendored dependencies.
convertersdeserializationserializationattrsconverter
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