I am Lin Yuchen from the AI Business Division. I have joined the Classmethod Group!
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Introduction
Nice to meet you!
My name is Lin Yuchen, and I joined the Classmethod Group in March 2026.
DevelopersIO has been a media outlet I've relied on through search results every time I ran into technical challenges. Now that I'm writing articles as a contributor myself (as a member of Classmethod), I feel a little nervous — but even more excited.
My Background
I started my career in Quality Assurance (QA) in the mobile industry. Through test design, bug classification, and UAT, I developed the habit of systematically thinking about "how users interact with a product" and "where it might break" — a foundation that still underlies my approach to development today.
Later, feeling the inefficiency of manual work in QA, I thought "maybe I can solve this by building something myself," and that's what sparked my transition into development. In recent years, development has become my primary focus. For example, I designed and implemented an orchestration system for SIM card swaps involving more than 20 interconnected steps, reducing what had previously been a two-day manual operation to under one minute. I handled everything from multi-API integration, state management, and error handling to log design, and in a small team I also worked on improving the development workflow (branching strategies and review culture).
Outside of work, I enjoy learning by getting my hands dirty.
- I was selected as one of the 10 finalists out of 113 projects at the AI Agent Hackathon with Google Cloud
- Built a RAG demo app from scratch to production deployment in 5 days
- Built a proxy server from scratch to understand how MCP works
- Writing technical articles and publishing npm packages (including CI/CD and Dependabot setup)
"Build first, experiment, then understand" — this mindset is the core of who I am as an engineer.
Why I Joined
The number one reason I decided to join was that I was strongly drawn to the "culture that values output".
Rather than keeping technical knowledge to yourself, sharing it openly to help others — I've been saved countless times by that spirit of DevelopersIO, back when I was the one doing the searching. I decided to join because I wanted to "grow within that cycle myself, and be useful to someone."
In addition, the fact that I could grow by discussing and reviewing with peers on equal technical footing, and that I could seriously engage with the cutting-edge field of generative AI, were also major deciding factors.
What I Want to Do Going Forward
First, I'll focus on getting used to Classmethod's pace and keeping up with the technology.
Beyond that, I plan to actively share what I learn in the generative AI and RAG space (building production systems using Amazon Bedrock and various LLMs), which is where I'm putting the most effort right now. My goal is to deliver "heartfelt output" — the pitfalls I fell into, breaking news on new features, the gotchas I only discovered by actually running things — in both Japanese and English.
I'll build up articles one by one that make people say, "This article saved me!"
Hobbies & Interests
Outside of tech, I love traveling and watching movies!
Exploring new places and immersing myself in the world of a film are great ways for me to recharge.
I'd be thrilled to chat not only about technology but also about hobbies with everyone at the company!
Closing
Going forward, I'll share information as a member of Classmethod — with a sense of responsibility, and with joy.
I look forward to working with all of you!
