Got rejected by Perplexity after the full onsite loop

Got rejected by Perplexity after the full onsite loop

Phone screen was GPU Credits II, the grant and usage events came in out of order and I had to replay everything by timestamp to get the balance right, using a heap to always deduct from whichever grant expired soonest. Took me a while to get the ordering logic straight and I only barely finished before time was up.

Made it to the onsite, three technical rounds plus a manager meeting. One was an infra round, they described a system that was overloaded and wanted me to name metrics I'd want to see, definitely something I hadn't prepped for. System design was mint.com, personal finance aggregator, had to think through account linking and syncing at a high level. Last coding round was some log processing and debugging, felt okay on that one honestly.

Got the rejection a few days later, no specifics on which round did me in. Everything's in Python there too if that's useful for anyone prepping for this one.