Hiroshi Ito
執行役員 CTO at 株式会社ログラス
Tokyo, Japan
Summary
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Rockstar🎓
Top SchoolHiroshi Ito is a seasoned engineering leader and current CTO based in Tokyo, with over a decade of experience scaling teams and systems across fintech and crowdfunding startups. He has grown and led teams of 10–35 engineers, driving architecture modernization—decoupling monoliths, introducing API-first and containerized platforms—and operationalizing QA and schema-driven development to support rapid product growth. Earlier in his career at Goldman Sachs he combined deep hands-on engineering and architecture work with open source advocacy, co-leading the migration of GS Collections to Eclipse Collections and contributing performance improvements to OpenJDK. A pragmatic, quality-focused practitioner, he champions test automation, measurable software quality, and developer workflows while remaining an active committer to a widely used Java collections project. Unexpectedly, his background in electrical and electronics engineering underpins a systems-thinking approach to both low-level performance tuning and high-level organizational design.
10 years of coding experience
18 years of employment as a software developer
Master’s Degree, Electrical and Electronics Engineering, Master’s Degree, Electrical and Electronics Engineering at Sophia University
English, Japanese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (10)
unit-testing10
collections10
javas10
data-structures10
eclipse-collections10
java10
data-structure10
functional-programming9
java-collections8
object-oriented-programming8
Programming languages (9)
Github contributions (5)
eclipse-collections/eclipse-collections
Jan 2018 - Jun 2018
Eclipse Collections is a collections framework for Java with optimized data structures and a rich, functional and fluent API.
Role in this project:
Back-end Developer / Test Automation Engineer
Back-end Developer / Test Automation EngineerContributions:13 commits, 13 PRs, 6 pushes in 4 months
Contributions summary:Hiroshi primarily contributed to optimizing the `UnifiedMap` data structure in Eclipse Collections, focusing on eliminating iterator usage for improved performance, particularly in the `detectOptional` method. They added a new test class, `UnifiedMapWithHashingStrategyNoIteratorTest`, to ensure iterator-free implementations. The user also made minor updates to the project's website, including fixing links and removing an extraneous div.
eclipse-collectionsapijava-collectionsprimitive-collectionscollections-framework
itohiro73/mac-provisioning
Aug 2015 - Sep 2021
Contributions:57 pushes, 1 branch in 6 years 2 months
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