Hayano Kengo
システムエンジニア at 株式会社ヴァンド
Chiyoda, Japan
Summary
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SeniorHayano Kengo is a systems engineer with 10 years' experience specializing in managing Japan–Vietnam offshore development, leading requirements, design, and quality for multi-million-yen web and SaaS projects. He consistently bridges upstream project management and hands-on technical work—owning complex design documents, DB architecture, and test plans while coordinating Vietnamese front/back leaders and large distributed teams. Recently he has driven AI/LLM feature development and is building a personal hybrid-vector RAG service using ChatGPT, Gemini, Cohere, Elasticsearch, Laravel and Nuxt.js, signaling a strong practical interest in applied AI. Known for stepping into technical gaps (e.g., taking full AI ownership when senior staff lacked expertise), he pairs long hours and meticulous documentation with a pragmatic focus on delivery.
10 years of coding experience
Github Skills (5)
rails-tutorial8
rails4
ruby-on-rails4
ruby3
renovate1
Programming languages (2)
Github contributions (5)
hayashikengo/DOOR
Sep 2018 - Jul 2022
Contributions:25 PRs, 46 pushes, 15 branches in 3 years 11 months
hayashikengo/neo4j_sample_app
Mar 2017 - Jul 2022
Contributions:4 pushes, 1 branch, 1 comment in 5 years 5 months
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