Beyond Boolean: Solving Hard Problems in Feature Flag Architecture at Scale
Talkat OpenFeature Summit Europe 2025 · on Tuesday, 2025-04-01· at 16:15· Level 3 | ICC Capital Suite 2-4·
summary
Covers three concrete scaling problems: cross‑region consistency, circular flag dependencies, and evaluation throughput. Describes implementing consistent hashing for identical targeting across services, using dependency graphs with a depth‑first search to block cyclical references, a stale‑flag heuristic (no edits in two weeks, 100% rollout, no deps) for cleanup, Redis‑backed proxy/CDN with server‑sent events, and an edge SDK: 390ms → 150ms flicker reduction; a Node SDK change yields ~10× faster, +38% RPS, −28% latency.
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chapters (12)
- 0:00Feature flag scaling challenges
- 2:06Making flags visible at scale
- 6:21Debugging flags with tools
- 8:50Avoiding cyclical dependencies
- 9:11Maintaining flags without chaos
- 10:55Removing stale flags
- 12:17Optimizing flag performance
- 13:20Feature flag proxy for scaling
- 14:23Edge SDK for faster flags
- 17:58Conclusion and key takeaways
- 19:02Q&A: GrowthBook language support
- 20:26Q&A: Air-gapped deployments
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