Notes from
the work.

Software, systems, and the things I’m learning along the way. From first principles to AI in production.

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A little theory. A lot of practice.

Three miniature block-built clusters connected by channels and small wooden balls

Systems9 min read

TTL cache freshness depends on when you start the clock

Compare selection-time and arrival-time TTLs, test exact expiration boundaries, and carry response age through an explicit HTTP caching example.

15 Oct 2026

Foundation

Miniature conveyor line with three stations and a curved side track

DevOps & cloud10 min read

An IAM role is assumed by a principal for a limited session

Read trust, caller and session policies separately, then run a local model that distinguishes resource permission limits from a temporary session expiration.

4 Oct 2026