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Feature Flagging & Experimentation

⬱ NIVÅ 3Tekniskt
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8 mÄnader
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Feature flagging is the platform engineering practice of decoupling code deployment from feature release via progressive rollouts, multivariate experiments, and real-time flag management. Career path: Practitioner (basic flags + percentage rollouts, $100-130k) → Advanced (targeting rules, experimentation integration, flag platform design, $145-185k) → Expert (custom flag services, real-time systems, blast radius management, $185-250k) over 6-12 months. Used by Netflix, Facebook, Uber to ship daily without fear. Ecosystem: LaunchDarkly, Split.io, Statsig, Unleash, Flagsmith, Optimizely, Eppo, ConfigCat, GrowthBook, PostHog.

Vad Àr Feature Flagging & Experimentation

Ship code without deploying features. Progressive rollouts, A/B tests, kill switches. Decouple deployment from release. Modern continuous delivery practice. Learning Curve: Medium (tooling + system design)

🔧 VERKTYG & EKOSYSTEM
LaunchDarklySplit.ioStatsigUnleashFlagsmithGrowthBookConfigCatOptimizelyEppoOpenFeaturePostHogPosthog

💰 Lön per region

OmrÄdeNybörjareMidErfaren
USA$105k$155k$210k
UKÂŁ65kÂŁ95kÂŁ135k
EU€72k€105k€150k
CANADAC$115kC$165kC$225k

❓ Vanliga frĂ„gor

Feature flagging vs feature flags, what's the difference?
Feature flags are the toggle mechanism (boolean on/off, percentage rollouts). Feature flagging is the system design discipline: how you architect rollout strategy, manage flag lifecycle, integrate with experiments, prevent technical debt, and scale flag management across teams. Think flags (tool) vs flagging (practice). This skill covers the architecture, process, and strategic layer.
What's the relationship between feature flagging and trunk-based development?
Trunk-based development = all engineers commit to main/trunk daily, never long-lived branches. Feature flagging enables this: you ship incomplete features on trunk (behind flags), deploy multiple times daily, and progressively roll out. Without flags, trunk-based dev would expose broken code to users. Flags are the safety net.
How do I avoid flag technical debt?
Set a kill-date when you create a flag (e.g. 'remove by 2026-05-15'). Track flag lifecycle: creation, ramp (1% → 10% → 100%), deprecation. Audit flags weekly in CI. Automatically fail tests if old flags (>90 days) are still in code. Archive flags properly, don't just delete. Most teams accumulate 200+ dead flags; the cost is real: slower tests, cognitive load, higher bugs.
How do multivariate flags differ from A/B testing flags?
A/B testing flags (2 variants: control vs treatment) measure statistical significance. Multivariate flags (3+ variants: A/B/C/D) explore parameter space. Multivariate needs larger sample size. Use A/B for shipping decisions (ship or kill). Use multivariate for optimization (which variant wins). Most platforms support both; the difference is statistical rigor and sample size planning.
What's the OpenFeature standard and why does it matter in 2026?
OpenFeature (CNCF 2024) is a vendor-neutral specification for flag evaluation: one SDK interface (open-feature-sdk) that swaps providers (LaunchDarkly ↔ Statsig ↔ PostHog). Reduces lock-in. In 2026, major platforms (Statsig, Eppo, GrowthBook) support it. Start with OpenFeature if you're unsure which provider long-term.
How do I measure flag impact on system performance (latency, cold starts)?
Flag evaluation is synchronous and must be <10ms p99. Use local flag caches (SDK caches rules in-process) rather than remote calls per request. Measure flag evaluation time in observability stack (CloudWatch, Datadog, New Relic). Monitor for 'flag thrashing' (flags changing during user session). For global flags, consider edge caching (Cloudflare, Vercel Edge). For critical paths, pre-compute flag state on service init.
What's a realistic cost for a feature flagging platform in 2026?
Unleash (open-source, self-hosted): free but ops overhead. LaunchDarkly: $200-500/month (small team), $2k+/month (enterprise). Statsig, Optimizely, Eppo: $500-3k/month depending on event volume and team size. PostHog (flags + analytics): $450+/month all-in. Flagsmith, Split.io: $200-1k/month. Most bootstrap with Unleash or PostHog, migrate to LaunchDarkly when scale justifies the cost.

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