Day 21/60: Practice: Production-ready API

60 Day Go Backend Engineering Challenge

Today I focused on turning the review day into an operational checklist instead of a loose pile of disconnected tools. The strongest checkpoints were sort lessons into request flow, data flow, operations, and failure-handling buckets, rebuild only the thin spots that would hurt a real service under load or during incidents, and write down the operational signal or contract check that should have surfaced earlier.

The mistake I wanted to avoid was calling the system understood because each individual tool looks familiar. The day felt better once the service boundary stayed visible and each component had one job.

The goal for tomorrow is simple: keep the rule clear enough that the next service still feels related to the same design idea. I also want to keep tracing one request path end to end because it exposes weak assumptions faster than a larger demo.