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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.

"The app is slow. Fix it." — said by the founder, with no further context. Is the homepage slow? Checkout? API responses? For which users? On mobile? Under what conditions? Turning vague business pressure into actionable performance work requires measurement before code.

A user submits a GDPR deletion request. You have 30 days to comply. But their data is in the main DB, the analytics DB, S3, Redis, CloudWatch logs, third-party integrations, and three months of database backups. You have 30 days. Start now.