KojiĀ Sekiguchi
Founder at RONDHUIT
Tokyo, Japan
Summary
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RockstarKoji Sekiguchi is a founder and seasoned software engineer based in Tokyo with 18 years of experience building and improving search and NLP systems. As Founder and CEO of RONDHUIT and a long-time Apache Software Foundation contributor, he is a Lucene/Solr/OpenNLP committer, PMC member, and project manager of KandaSearch. His open-source contributions include deep backend work on Lucene/Solr highlighting and synonym handling, and rigorous test automation for Apache OpenNLP to raise code quality and stability. He blends product-focused leadership with hands-on engineering, often shipping nuanced improvements to search relevance and result presentation. Colleagues appreciate his dual focus on robust testing and practical feature enhancements that tackle real-world indexing and query challenges. He brings entrepreneurial grit and a rare combination of search internals expertise plus production-grade QA discipline.
18 years of coding experience
Github Skills (18)
lucene10
unit-testing10
testing10
solr10
java10
javas10
natural-language-processing10
nlp10
apache9
seo9
search-engine9
optmization9
optimisation9
algorithm7
algorithms7
Programming languages (2)
Github contributions (5)
apache/opennlp
Apr 2017 - Oct 2018
Apache OpenNLP
Role in this project:
QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:6 reviews, 41 commits, 69 PRs in 1 year 6 months
Contributions summary:Koji's commits focused on adding and expanding tests within the `apache/opennlp` repository. They added new test cases for `DataIndexers`, `StringList`, feature generators, and event-related components. The changes included the addition of several new test files, suggesting a goal to improve code coverage and ensure the stability of different components within the OpenNLP library.
opennlpapachecomplingnlptextprocessing
apache/lucene
Dec 2023 - Dec 2023
Apache Lucene open-source search software
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 comment in 1 day
Contributions summary:Koji contributed to the Apache Lucene project by implementing enhancements to Solr's highlighting and query processing functionality. They made changes to integrate the `hl.maxAlternateFieldLength` parameter within the solr-ruby client and added support for several more highlighting parameters, indicating a focus on improving search result presentation. Further, the user modified synonym filter implementations to improve their handling of multiple synonym files, demonstrating a deep understanding of search index behavior.
lucenesearchnosqljavabackend
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