Mitsunori Komatsu
Software Engineer at Scalar, Inc.
Tokyo, Japan
Summary
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RockstarMitsunori Komatsu is a seasoned backend software engineer based in Tokyo with 17 years of experience building high-throughput data ingestion and distributed systems, currently at Scalar, Inc. He specializes in Linux, Kotlin, Java, and PostgreSQL, and often serves as a playing manager and occasional software architect for small teams. An active OSS maintainer, he contributes to notable projects like Digdag (workload automation) and msgpack-java, where he enhanced PostgreSQL integration and improved thread-safety and Android compatibility. Mitsunori combines pragmatic engineering with a focus on reliability and performance, and his work reveals a knack for making low-level serialization and database operators robust under concurrent, production-grade loads.
17 years of coding experience
English, Japanese
Stackoverflow
41reputation
28kreached
5answers
0questions
Github Skills (24)
serializable10
postgresql10
serializer10
java10
serialization10
javas10
deserialization10
sql10
messagepack10
concurrency9
database-management9
amazon-redshift8
android-development8
aws-redshift8
spring-data-jdbc6
Programming languages (20)
Github contributions (5)
msgpack/msgpack-java
Jan 2013 - Jan 2023
MessagePack serializer implementation for Java / msgpack.org[Java]
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 reviews, 391 commits, 176 PRs in 10 years 1 month
Contributions summary:Mitsunori primarily worked on implementing and maintaining the `msgpack-java` library, which involves message serialization and deserialization. Their contributions include porting components to support older Android versions, adding features such as a Dalvik VM checker, optimizing code with thread-local variables, and improving the support for complex data structures. The user also focused on enhancing the library's thread safety and developed tests to validate its behavior under concurrent access.
msgpackserializationmessagepackserializerjava
treasure-data/digdag
Mar 2016 - Aug 2021
Workload Automation System
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 release, 144 reviews, 491 commits in 5 years 5 months
Contributions summary:Mitsunori primarily contributed to the backend aspects of the Digdag project, focusing on the implementation and improvement of PostgreSQL functionality. They developed a PostgreSQL operator, including insert, create table, and update functionalities. The user also added the ability to download query results and handle schema-related operations within the PostgreSQL operator.
workload-automationdigdagsystem-automationautomationworkload
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