// TOPIC
#analytics
3 articles
◆◆◆AdvancedMetaGoogle
01Design an A/B Testing & Experimentation Platform
Run thousands of controlled experiments at once. Deterministic bucketing, exposure logging, the metrics pipeline, statistical significance, and the peeking problem.
#interview#experimentation#analytics
23 min◆◆◆AdvancedMetaGoogle
02Design an Ad Click Aggregator (real-time analytics)
Ingest billions of ad events, serve per-minute metrics in near-real-time, and produce exact totals for billing — the canonical streaming + lambda/kappa problem.
#interview#streaming#analytics
21 min◆◆◆AdvancedTwitterMeta
03Design Top-K / Trending (heavy hitters)
Find the top-K most frequent items in a massive stream without counting everything exactly. Count-Min Sketch, heavy-hitter algorithms, and approximate streaming aggregation.
#interview#streaming#probabilistic
22 min