Book: + | | . The feature-flag design lives next to the rate-limiter, the URL shortener, and the notification system; each one structured around the 90-second answer and the follow-up questions that actually decide the round.
What's the gnarliest follow-up you've been asked on this kind of design? Drop it in the comments and I'll work through it.
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Design a Feature Flag Service: 100k SDK Clients and the SSE Protocol Reframe
- ▸ The interviewer's hidden question: how do you scale READS?
- ▸ Naive design: REST polling, and why it dies at 100k clients
- ▸ The reframe: SSE push from server, clients hold the connection
- ▸ Edge caching: flag evaluations at the CDN edge for read-anywhere clients
- ▸ Flag-config distribution: durable store, snapshot to object storage, push diffs over pubsub
- ▸ SDK-side caching with TTL + fallback (offline-safe)
- ▸ Targeting and rules engine: boolean predicates, rollout percentages, sticky bucketing
- ▸ The 90-second answer that wins the round
- ▸ The gotcha: sticky bucketing requires a deterministic hash, and every SDK must agree
- ▸ If this was useful

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