Missions

What do you want to practice?

Learn it. Practice it. Break it. Debug it. Explain it. Remember it. Each mission is a focused 5-20 minute loop that ends in a real production failure you have to diagnose — not a video, not a quiz.

Production

Database Connection Pool Exhaustion

Understand why autoscaling can quietly exhaust a database — then diagnose and fix it under pressure.

15 minPostgreSQLKubernetes

Production

Terraform State Drift

Understand drift, state, and infrastructure differences — then diagnose it for real.

12 minTerraformInfrastructure as Code

Practical

Kubernetes CrashLoopBackOff

Understand why containers crash-loop, and how to find the real cause instead of restarting harder.

10 minKubernetesContainers

Practical

CI/CD Deployment Failure

Understand why passing tests don't guarantee a safe deploy, and how to isolate what a rollout actually broke.

10 minCI/CDFeature Flags

Foundation

RAG Retrieval Failure

Understand why a RAG system can look confident and be completely wrong — then diagnose it.

8 minRAGLLMs

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