
Katsuhiro Yamakawa
Builder
I didn't start out as an engineer. I was running the business, and ended up building the systems myself.
ABOUT
実装から来た人間ではない。事業を回す側にいて、開発もやるようになった。I didn't start out as an engineer.I was running the business, and ended up building the systems myself.
受託開発を主とする企業に、フルリモートで勤めている。並行して個人でも開発を請け負い、必要になった仕組みは小さく OSS として公開している。マンション管理会社の外部 CTO も務め、現場の DX を進めている。
Working fully remote at a contract development firm, while also taking on freelance work and releasing the tooling it needs as small open-source projects. Also serving as External CTO for a property management company, driving DX on the ground.
学習塾を12年、合同会社を設立から清算まで経営。税理士を立てず決算までやってきたので、事業の金がどこを通っているかを自分で読める。依頼を待たず、数字を見て直すものを決めるところから入る。
Twelve years running a tutoring school, and an LLC from founding through liquidation. Having closed the books myself without an accountant, I can read where the money moves in a business. I start from the numbers rather than from a brief.
どちらも、仕組みを作るのも毎日使うのも自分だった。手順を一つ増やせばそのまま自分の手間になるので、増やさずに回る形を先に考えるようになった。教えるときも、言って聞かせるより、生徒が自分で進められるよう場と段取りを整えるほうが続いた。
In both, I built the systems and used them every day. Every extra step landed back on me, so I learned to find a way to run things without adding steps. Teaching was the same: setting up the room and the sequence so students could move on their own lasted longer than telling them what to do.
いまの仕事でも、仕組みは納めて終わりにしない。新しいやり方は押し付けても使われないので、使われ方を見て合わないところを直し、現場で回り出すまで付き合う。
In my work now, delivery is not the end. A new way of working pushed onto people does not get used, so I watch how it is used, fix what does not fit, and stay with it until it runs on its own.
COVERAGE
1人で設計・実装・運用Solo Design, Dev & Ops
| Frontend | ReactVueTypeScript |
| Backend | C# (.NET)PythonGo |
| Data / AI | PostgreSQLLangGraphRAGText-to-SQL |
| Infra / SRE | NixOSTerraformCloudflareAWS |
| IoT | Raspberry PiEspressif |
TIMELINE
@Management
@Engineering