Kazuhiro Sera
Developer Experience Engineer, SDKs & Japan at OpenAI
Chiyoda, Japan
Summary
🤩
Rockstar🎓
Top SchoolKazuhiro Sera is a pragmatic developer experience engineer with nearly two decades of hands-on experience building and operating high-performance systems, now maintaining OpenAI's Agents SDKs and leading developer outreach for Japan. He previously shaped SDKs and developer relations at Slack—authoring much of the Bolt framework—and led large engineering teams at SmartNews to resolve performance at scale on AWS. Comfortable across languages and back-end ecosystems, his open-source footprint includes contributions to prominent projects like Homebrew, Scalatra, ScalikeJDBC, and multiple Slack SDKs, often improving build systems, dependency upgrades, and API integrations. He pairs deep implementation skills with developer advocacy, translating platform capabilities into samples, docs, and localized onboarding for Japanese partners. Known for pragmatic problem-solving, he frequently focuses on stability, tooling, and internationalization to make platforms reliably usable in production. A Waseda graduate, he combines enterprise-scale leadership with sustained OSS craftsmanship and community engagement.
16 years of coding experience
BA School of Commerce, BA School of Commerce at Waseda University
Japanese, English
Stackoverflow
1,842reputation
87kreached
66answers
2questions
scala
top-5%
Github Skills (62)
dependency-management10
json10
git10
hubot10
slack-api10
build-configuration10
coffeescript10
back-end-development10
apidoc10
python10
redis10
testing10
databases10
bots10
typescript10
Programming languages (20)
Github contributions (5)
scalikejdbc/scalikejdbc
Nov 2011 - Oct 2021
A tidy SQL-based DB access library for Scala developers. This library naturally wraps JDBC APIs and provides you easy-to-use APIs.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:44 releases, 41 reviews, 2121 commits in 10 years 1 month
Contributions summary:Kazuhiro primarily focused on implementing and modifying core back-end features within the ScalikeJDBC library, as evidenced by commits that refactored core components, updated configuration, and introduced new APIs for enhanced database interactions. This involved modifying SQL statements, improving interpolation mappers, and enabling features like dynamic connection pool name and table name support. The contributions also included fixing bugs related to SQL execution.
mysqldatabase-accesswrapssqltype-safe
slackapi/bolt-python
Jun 2020 - Dec 2022
A framework to build Slack apps using Python
Role in this project:Backend Developer
Backend DeveloperContributions:80 releases, 361 reviews, 575 commits in 2 years 7 months
Contributions summary:Kazuhiro primarily contributed to the Bolt framework for Python, focusing on the implementation of features and addressing issues. Their work involved updating dependencies, integrating OAuth flow support, and addressing a bug related to message events. The commits show a strong understanding of the framework's architecture, as demonstrated by changes across multiple modules and components, including middleware and listener implementations. The user demonstrated the capability to integrate with third-party services using the framework.
chatopspythondjangoflaskaiohttp
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