You Yamagata
Staff Software Engineer at Treasure Data
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolYou Yamagata is a Staff Software Engineer in Tokyo with 14+ years building large-scale data engineering and document-processing systems, currently driving backend and cloud efforts at Treasure Data. He has deep multi-language expertise (Scala, Java, Python, C/C++, Perl) and hands-on experience across Spark, BigQuery, PostgreSQL, MongoDB, Elasticsearch and both GCP and AWS. A pragmatic systems thinker, he contributes to notable open-source projects such as Digdag—improving retry semantics and resilience—and has a history of plugins and tooling work (Embulk, OpenStack). His career spans leadership and senior engineering roles at startups and major firms, blending low-level systems roots with modern cloud-native data platforms. An interesting detail: he pairs production-grade engineering with long-term OSS stewardship, routinely adding tests, docs and configurable limits to make tools safer for large deployments.
14 years of coding experience
22 years of employment as a software developer
MS, MS at Tokyo Institute of Technology
Japanese, English
Github Skills (6)
javas10
dag10
workflow-automation10
java10
testing10
configuration-management9
Programming languages (5)
Github contributions (5)
treasure-data/digdag
Aug 2018 - Jan 2023
Workload Automation System
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 releases, 185 reviews, 314 commits in 4 years 5 months
Contributions summary:You primarily contributed to the core functionality of the workload automation system, focusing on enhancing retry mechanisms within Digdag. They added tests and documentation for retry intervals, improving the system's resilience. The user also fixed minor issues in utility classes related to retry controls and configuration formats. Furthermore, the user refactored the TD operators and added configurable limits.
workload-automationdigdagsystem-automationautomationworkload
yoyama/digdag
Aug 2017 - Sep 2023
Workload Automation System
Contributions:315 pushes, 162 branches in 6 years 2 months
workload-automationsystem-automationautomationautomation-frameworkworkload
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