About

I’m Leonel Castañeda, a Platform / DevOps engineer. I like working where infrastructure, software, and people meet.

My focus is making change safe and sustainable: platforms that let teams move quickly without losing reliability, security, or operational clarity. I’ve worked across startups and larger organizations, from new builds and migrations to the everyday work of running production platforms.

Over time, I’ve learned that a lot of real impact comes from work that is not especially flashy: clear documentation, useful runbooks, maintainable automation, paved roads, hands-on pairing, and guardrails that help teams adopt better practices without feeling blocked.

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: notes on observability, automation, internal platforms, 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.