Past-work deep-dive rehearsal

The deep-dive is where Cursor checks that you operate as a functioning senior IC, not someone who watched a project happen near them. They pick the at-scale thing you built and drill until they hit either bedrock or hand-waving.

Pick your strongest at-scale infra project and rehearse it cold. The selection rule matters: choose the one where you owned a hard decision and can put numbers on the outcome, not the one with the prettiest diagram.