About

I’m Leonel Castañeda, a Platform / DevOps engineer.

I focus on making change safe and sustainable — building platforms where teams can move fast without sacrificing reliability, security, or governance. I’ve worked across startups and larger organizations, from greenfield builds and migrations to the day-to-day reality of running and scaling production platforms.

A large part of the job is quiet, unglamorous work: clear documentation and runbooks, paved-road tooling, hands-on pairing, and guardrails that help teams adopt new practices with confidence. That’s usually where long-term impact actually comes from.

Currently

I live in Tokyo and work as a DevOps engineer at a company that develops systems for innovation in smart cities.
On this site, I write DevOps in Practice — practical notes on observability, automation, and dependable delivery, based on real systems and real constraints.

What I Do

• Design cloud architectures focused on reliability and steady iteration.
• Codify infrastructure and environments so changes are reviewable and repeatable.
• Automate delivery with guarded rollouts and fast, proven rollbacks.
• Make systems observable with clear SLIs/SLOs and actionable alerts.
• Help change stick through paved roads and sensible guardrails (policy-as-code, access boundaries, cost visibility), supported by clear docs and hands-on pairing.

How I Work

• Keep things simple and boring where it matters.
• Move in small, reversible steps with short feedback loops.
• Automate the routine; document the tricky.
• Prefer clarity over cleverness.
• Make the right thing the easy thing — calm systems, calm teams.