COSCUP 2025

4geru

I'm a LINE API Expert, recognized by LINE as an external professional skilled in their APIs.

For the last 7 years, I've been working as both a Ruby engineer and an active LINE API Expert.

In addition to my work, I enjoy organizing hands-on developer events 3 to 4 times each year. I don't just use the official LINE API packages; I also help improve them by creating Pull Requests (PRs).


Session

08-09
10:00
30min
How OpenAPI Is Transforming API Client Development
4geru

OpenAPI-driven automation is changing how we build and maintain API clients.
This session shares real-world lessons from migrating the LINE API Ruby SDK from manual maintenance (v1) to automated, OpenAPI-based generation (v2).
We'll cover the "God Class" problem, update delays, and how automation improved quality and speed.

Let's read the open source code
TR409-2