Kenn Ejima
Co-Founder at Dot Product AI
Chiyoda, Japan
Summary
👤
Senior🎓
Top SchoolKenn Ejima is a serial founder and lifelong software developer with 15 years of experience building high-growth consumer and AI products from MVP to scale. Currently co-founder of Admit AI and Dot Product AI (maker of Gista), he blends product-first engineering with hands-on implementation—shipping one of the first Realtime API interview prep apps and an early web-embeddable RAG chatbot. Previously he led Quora’s expansion in Japan and scaled East Meet East into the #1 dating app for Asian Americans, demonstrating rare expertise in growth, localization, and cross-functional execution. His engineering roots run deep—contributing backend improvements to the widely used Doorkeeper OAuth2 gem—and he has a track record of architecting high-throughput systems on minimal budgets. Trained in applied mathematics and physics at Kyoto University and coding since age six, he pairs analytical rigor with practical product instincts. Based in Chiyoda, Japan, Kenn thrives at the intersection of AI, user experience, and scalable engineering.
15 years of coding experience
11 years of employment as a software developer
BE, Applied Mathematics and Physics (Computer Science), BE, Applied Mathematics and Physics (Computer Science) at Kyoto UniversityCoding since the age of 6, Coding since the age of 6 at Self-taught
English, Japanese
Stackoverflow
3,343reputation
133kreached
16answers
20questions
activerecord
top-5%
Github Skills (19)
authorizations10
authentication10
user-authentication10
rails10
ruby10
authorization10
oauth10
ruby-on-rails10
testing9
activerecord9
database6
eventmachine6
unicorn6
key-value-store6
optimistic-locking6
Programming languages (15)
Github contributions (5)
doorkeeper-gem/doorkeeper
Apr 2014 - May 2014
Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 commits, 3 comments in 21 days
Contributions summary:Kenn primarily focused on enhancing the Doorkeeper OAuth 2 provider for Ruby on Rails. Their contributions involved adding new configuration options, such as `reuse_access_token`, and modifying core components related to access token management. The user also addressed specific issues related to locale handling and corrected rebase issues. Furthermore, they added tests and made code improvements.
omniauthoauth2-serveridentitydoorkeeperruby
kenn/sunzi
Feb 2012 - Jan 2019
Sunzi: Server configuration automation for minimalists
Contributions:106 commits, 1 PR, 16 pushes in 6 years 11 months
configurationconfiguration-serverconfiguration-managementansibleconfig
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