Ryu Kobayashi
Software Engineer at Treasure Data, Inc.
Chiyoda, Japan
Summary
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SeniorRyu Kobayashi is a seasoned software engineer with 14 years of experience building mission-critical enterprise systems and large-scale, cloud-native data platforms. He blends deep hands-on expertise in Hadoop, MapReduce, Cassandra and AWS with practical ML-powered services such as recommendation engines and web-log time-series analytics. At Treasure Data and prior firms he led design and delivery of distributed processing systems and beacon-style tracking/analysis pipelines, often interfacing directly with business executives and cross-functional engineering teams. An active contributor to Apache Hive, he has improved performance and extensibility in a major open-source analytics project—a testament to his focus on robust, high-performance back-end engineering. Based in Chiyoda, Japan, he combines systems-level thinking with pragmatic project management to turn complex data requirements into production-ready solutions.
14 years of coding experience
17 years of employment as a software developer
Github Skills (8)
javas10
hive10
sql10
java10
optimization10
apache9
vectorization9
big-data9
Programming languages (2)
Github contributions (5)
apache/hive
Jun 2016 - Jan 2019
Apache Hive
Role in this project:
Back-end Developer
Back-end DeveloperContributions:66 reviews, 2 commits, 26 PRs in 2 years 7 months
Contributions summary:Ryu primarily contributed to the Apache Hive project, focusing on bug fixes, performance improvements, and the addition of new features. Their work includes addressing issues with vectorization, like the handling of control characters and optimizing the LIKE UDF. Furthermore, they addressed performance regressions in map-hash aggregation and fixed issues related to task execution summaries. The user also implemented support for custom plugins in ReExecution.
apache-hivehivejavadatabasesql
ryukobayashi/hive
Apr 2021 - Jul 2026
Apache Hive
Contributions:198 pushes, 34 branches, 3 tags in 5 years 4 months
flinkapachebig-datasparkdatabase
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