Keitaroh Kobayashi
Founder at KotobaMedia, Inc.
Yakushima, Kagoshima, Japan
Summary
🤩
Rockstar🎓
Top SchoolKeitaroh Kobayashi is a founder and seasoned software engineer with 14 years of experience building geospatial and full-stack systems from Japan’s Yakushima. He has led engineering teams and startups (including KotobaMedia and Geolonia) and brings hands-on expertise across backend, DevOps/SRE, and mobile development. Keitaroh is an active open-source contributor—his work added LISTEN/NOTIFY support to the Postgrex Elixir driver and performance-tuned GPUImage filters for iOS—showing a rare blend of database internals and GPU image-processing experience. He combines product-focused leadership with low-level engineering pragmatism, often connecting digital and physical worlds through geospatial tech.
14 years of coding experience
13 years of employment as a software developer
Bachelor of Arts, Computer Science, Bachelor of Arts, Computer Science at International Christian University
English, Japanese
Stackoverflow
1,498reputation
108kreached
18answers
12questions
Github Skills (25)
unit-testing10
objective-c10
ios10
postgresql10
image-processing10
elixir10
exunit10
gpuimage10
filter10
filtering10
opengl-es10
test-unit10
async9
asynchronous9
database-driver9
Programming languages (15)
Github contributions (5)
BradLarson/GPUImage
Feb 2012 - Mar 2012
Role in this project:
Mobile Developer (iOS)
Mobile Developer (iOS)Contributions:11 commits in 7 days
Contributions summary:Keitaroh primarily contributed to the development of an iOS framework for GPU-based image and video processing. Their work involved implementing new image processing filters, specifically a vignette filter and a Gaussian blur filter with selective blurring functionality. The user also integrated these new filters into a filter showcase application, demonstrating their usability. Further refinements involved optimizing Gaussian blur and refactoring the selective blur for improved performance.
imagegpucameraios-frameworkvideo-processing
elixir-ecto/postgrex
Dec 2014 - Dec 2014
PostgreSQL driver for Elixir
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 commits, 1 comment in 18 days
Contributions summary:Keitaroh's commits focused on implementing and improving notification support within the Postgrex Elixir driver. They added LISTEN/NOTIFY functionality, enabling asynchronous notifications from the PostgreSQL database. This involved modifying the connection and protocol modules, along with adding tests to verify the functionality, including payload support. Additionally, the user introduced monitoring of processes sending LISTEN commands to handle process death.
postgresqlelixirpostgrespostgresql-driver
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