# What Reliable SaaS Deployments Need Beyond Docker
Containerizing an application solves only part of the deployment problem.
Humzio runs multiple application components, including web applications, APIs, background processing, scheduling, PostgreSQL and Redis. Making those components start together is useful, but reliable delivery requires more.
Practices that mattered
- Keep development, staging, demo and production responsibilities clear.
- Build immutable application images and promote predictable artifacts.
- Run database migrations deliberately.
- Verify health after deployment rather than assuming a running container means a healthy application.
- Back up important state before risky changes.
- Keep rollback procedures practical and tested.
- Store secrets outside source control and deployment files.
The lesson is that deployment is a workflow, not a single command. Automation should cover the checks around the release as well as the release itself.