Postgres query tuning in production
Reading EXPLAIN ANALYZE against a live table, and which of its numbers actually predict a slow query.
9 MIN
Yacht chartering with real-time availability, per-yacht specification pages and a quote flow that prices extras against selected dates.

Four phases with fixed review gates. No phase starts before the previous one has produced its artefact.
Reading EXPLAIN ANALYZE against a live table, and which of its numbers actually predict a slow query.
The access patterns that genuinely favour a document store, and the far more common ones that do not.
Token bucket against sliding window at the edge, and what each does to a client retrying badly.
Discovery starts with a technical audit you keep, whether the engagement continues or not.