Paste the job description. Talk with an AI interviewer. Get a per-question scorecard in under twenty minutes.
No card · microphone required · cancel anytimeDesign a URL shortener for 10 billion redirects per month. Where does the bottleneck move first?
Base62 short keys, writes go to a primary with replication; reads hit a CDN + hot-key cache. The counter that mints IDs is the real bottleneck at 4 million writes a day, so I'd shard or pre-allocate ranges.
Questions generated in about four seconds, tuned to the role.
Ten minutes of voice with an AI that interrupts, pushes back, follows up.
Per-question feedback, ideal answers and the specific things to fix next.