One production incident — walk the investigation out loud.
One extended conversation around a single scenario, not a series of short questions — expect to go deep on 2-3 areas the interviewer picks based on what you say, rather than covering many topics shallowly. This runs longer than the question-based tracks.
Error rates on your main API jumped from under 1% to 15% right after a deploy 20 minutes ago.
Customers are reporting that checkout is timing out intermittently, but your dashboards look mostly normal.
A key background job hasn't processed anything in the last two hours, and a queue is backing up.
Your database's CPU usage has been steadily climbing over the last week and just hit 95%.
These are a few examples — the real scenario for your session is chosen at random from a larger pool, matched to your chosen difficulty.
5 free interviews every month, any track, no card required.