In progressOnsite

A GPU Credit Coding Question, Then a Surprise Fullstack Design Round

OpenAISoftware Engineer · Onsite · Jul 2025

The coding round was the GPU credit problem, and it was actually pretty simple — the whole thing was only about 30-40 lines of code. add_credit subtract get_balance Three functions. I used two heaps to maintain the credit entities and the subtraction events. The first two functions were just simple heappush calls. get_balance was a little more complex — mainly because subtract needs to prioritize…

Shared by a candidate · reported Jul 2025. Interview formats change; use it as a guide, not a script.