Estimation
YouTube-lite: QPS, store, pipe
Upload, storage, CDN egress. State assumptions, then compute. No fake precision.
Week 6Tuesday 13 OctoberEstimation
Day 39: Estimation drills
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Estimation
Teams presence, 300M MAU
Heartbeat rate, payload, boxes, and how you shard presence.
Estimation
Latency cheat sheet from memory
L1/L2, RAM, SSD, disk, DC RTT, packet in CA↔NY. Recite, then check.
Coding review
Random LC medium, narrate first
Pick one unseen medium. 3 minutes of talk, then code.