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Code RoomNetwork flow telemetry collector
HardPrep Room Coding #3810

Network flow telemetry collector

System designNetworking & APIsSenior–Staff~45 min

Design a network-telemetry / flow-record collector that ingests NetFlow/IPFIX/sFlow from 50,000 routers and switches, peaking at 5M flow records/sec over UDP. It must handle lossy UDP ingest, template-based decoding, high-cardinality aggregation (top talkers, per-prefix bytes), and serve both real-time anomaly detection and historical queries. How do you ingest, decode, aggregate, and store at this rate?

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.

Clarify5:00 left
Estimate5:00 planned
Design15:00 planned
Deep dive12:00 planned
Failure8:00 planned
0:00
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.