Automatic caption generation and alignment
Design the automatic caption/subtitle generation and alignment pipeline for a video platform that must produce time-synced captions (and translations into 30+ languages) for every uploaded video, including live streams where captions must appear within ~3s of the spoken word. Captions must be accurately word-timed for highlighting, support creator edits without re-running ASR, and handle a backlog of millions of pre-existing videos.
What a strong answer looks like
Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.
Clarify4:30 left
Estimate4:30 planned
Design13:30 planned
Deep dive10:30 planned
Failure7:00 planned
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.