High-velocity engineering teams decoupling code deployment from feature release—and running statistically rigorous product & AI prompt experiments—frequently search to hire a freelance Feature Flags (GrowthBook, LaunchDarkly, PostHog, Unleash, OpenFeature) & A/B testing programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack Developer available via Upwork.
Core Feature Flagging, Canary Rollouts & Experimentation Capabilities
- Zero-Latency Edge & SSR Flag Evaluation: Evaluating feature flags at the Next.js Middleware / Cloudflare Edge layer so users never experience layout shifts or flashes of unstyled/old content (FOUC).
- Progressive Canary Rollouts & Instant Kill Switches: Wrapping new database queries, payment flows, and LLM model upgrades behind tenant-targeted percentage rollouts with automated error-rate rollback triggers.
- Bayesian & Frequentist A/B Experimentation (GrowthBook / PostHog): Instrumenting warehouse-native experiment assignment tables in BigQuery, ClickHouse, or PostgreSQL to measure conversion lift and AI accuracy impact.
Frequently Asked Questions
Can we self-host an open-source alternative to LaunchDarkly to save on per-seat/MAU costs?
Yes. I deploy self-hosted GrowthBook, Unleash, or Flagsmith backed by your own PostgreSQL and Redis infrastructure, wrapped behind the vendor-neutral CNCF OpenFeature SDK.
How can we hire you for feature flagging and experimentation architecture?
Reach out on Upwork.