Logging, metrics, and tracing
The three signals and the questions each one can actually answer.
Learning path
Operability and production readiness
Run systems in production: observe, deploy, recover, and secure with intent.
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Alerting and on-call fundamentals
Page a human only when a human can and must do something.
Feature flags and progressive delivery
Separate deploying code from releasing behaviour.
Configuration management
Keep configuration explicit, versioned, and separate from code.
Secrets management
Store, rotate, and scope credentials without leaking them.
Deployment strategies and rollback
Ship changes with a rollback path baked into the mechanism.
Incident response and postmortems
Coordinate during outages and learn from them blamelessly afterward.
Chaos engineering and failure injection
Probe failure modes deliberately before they surprise you.
Disaster recovery and backups
A backup you have never restored is a hypothesis, not a plan.
Security basics for backend engineers
The handful of failures that account for most real breaches.