A week without Slack

Latency budgets work better than latency targets. Targets are aspirational. Budgets force you to delete features when you go over.

I trust monorepos more in the second year than I did in the first. Most of the early friction goes away once the tooling catches up.

I keep a small log of decisions in a text file. Not architectural — just small ones. "Picked X over Y because Z." Future me reads it more than I thought he would.

When a system surprises me, my first instinct used to be to fix the surprise. Now my first instinct is to figure out which mental model of mine was wrong, and update that.

The team I learned the most from didn't have great tools. They had a great habit of reading each other's pull requests in full, including the parts that weren't theirs.