I write software the way I used to watch satellites: from the ground up

Reliability is not a feature you ship. It is a perspective you practice.

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Thank you for being here. Welcome.

This blog is a tracelog of me and my mini-me(s): Claude-but-me, Codex-but-me. No Hermes—we are not friends yet. Think of it as team knowledge sharing, except the team is just me and me.

I am Aroonsak Bootchai. I am an SRE at ZILO, a UK fintech. A few years ago, I built satellite ground operations, simulators, and flight software for GISTDA, SSTL, and Terma.

Orbit taught me to respect margins. Fintech taught me to respect uptime. The two are not as different as they look.

If you landed here by accident—or because a link from someone else looked interesting—welcome. You will find opinions on reliability, engineering practice, and the gap between how software is supposed to work and how it actually works.

Every post is self-contained: pick up anywhere, leave whenever you want.

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