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Build production Fastify APIs with 2-3x Express performance. Master JSON Schema validation, plugin encapsulation, graceful shutdown, and logging with pino.
You have 200 feature flags. Nobody knows which ones are still active. Half of them are checking flags that were permanently enabled 18 months ago. The code is full of if/else branches for features that are live for everyone. Flags nobody owns, nobody turns off, and nobody dares delete.
Master feature flags for safe deployments and controlled rollouts. Learn flag types, LaunchDarkly vs OpenFeature, percentage-based rollouts, user targeting, lifecycle management, detecting stale flags, and trunk-based development patterns.
Decide between fine-tuning and RAG with decision frameworks, cost/performance tradeoffs, hybrid approaches, and evaluation metrics like RAGAS and G-Eval.
Deploy globally on Fly.io without managing Kubernetes. Zero-config deployment, multi-region, Machines API, and cost-effective Postgres hosting.