Concurrent edits: detect the conflict instead of clobbering the winner.
Name it
Say what this problem really is, professionally — the concept + when it bites. practice the framing →
Explain it out loud
Say it in your own words — but hit these: version column · compare-and-set · zero rows · conflict · retry · throughput
checking microphone…
Code it (7-step rhythm, narrate)
Clarify → approach → data model → narrate → edge → test → tradeoff. AI off. Lab: optimistic lock →
Edge cases — say + handle each
Say the trade-off
“Optimistic wins on throughput when conflicts are rare; under high contention you burn cycles on retry and pessimistic is cheaper.”
checking microphone…
Answer the follow-up
What exactly happens on a conflict?