Feature Flag System with Targeted Rollouts
Build a feature flag system supporting percentage rollouts, user targeting, and A/B test integration.
TypeScript or GoPostgreSQLRedis
About this project
Feature flags are a primary lever for safe deploys. Building one from scratch teaches: deterministic hashing for stable user-to-bucket assignment, evaluation latency optimization, audit logs, and the API patterns LaunchDarkly competitors use. Bonus: integrate with an A/B test framework (Statsig, GrowthBook) for end-to-end experimentation.
Why build this in 2026?
Every AI feature is rolled out behind a flag now (LLM costs, hallucination risk). Strong infra primitive to know.
What you'll ship
- GitHub repo
SDK client for one language
Admin dashboard (basic CRUD is fine)
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Skills you'll practice
postgresqlrest apisredis