Kosei Kitahara
Software Engineer at pyspa
Chiyoda, Japan
Summary
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SeniorKosei Kitahara is a pragmatic software engineer based in Chiyoda, Japan, with 15 years of experience focusing on back-end systems and practical maintenance of production code. He contributes to notable open-source projects like django-haystack, where he modernized search backends for Elasticsearch 7 by porting and refactoring legacy code and reworking tests to align with new APIs. Known self‑deprecatingly as a "lazy programmer," he favors efficient, maintainable solutions that reduce long‑term effort and technical debt. His strengths lie in upgrading and adapting existing systems—removing deprecated options, simplifying mappings, and ensuring compatibility—rather than building from scratch. This combination of longevity in the field and a maintenance-first mindset makes him a reliable engineer for legacy modernization and searchable data platforms.
15 years of coding experience
Github Skills (11)
amazon-elasticsearch10
elasticsearch10
elasticsearchquery10
backend10
aws-elasticsearch10
haystack10
python10
back-end-development10
django10
elasticsearch-api10
testing10
Programming languages (15)
Github contributions (5)
django-haystack/django-haystack
Jun 2021 - Jun 2021
Modular search for Django
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 commits, 1 PR, 1 comment in 9 days
Contributions summary:Kosei primarily focused on updating the backend of the django-haystack project to be compatible with Elasticsearch 7. Their contributions involved porting and adapting existing code, specifically from Elasticsearch 5 backends and tests. Key changes included refactoring to remove deprecated options and align with Elasticsearch 7's API, such as removing `doc_type` options and adjusting the schema mapping. The user also implemented and enabled tests to validate the functionality of the updated backend.
pythondjangomodularcreative-commonssearch
Surgo/django-timezone-utils
Apr 2015 - Dec 2019
Time zone utilities for Django models.
Contributions:9 pushes in 4 years 9 months
zonepythondjangozonesdjango-models
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