Quick answer
Security is a system of access, data protection, monitoring, backups, updates, and recovery, rather than a single feature added at the end.
Protect the paths into the system
Start with unique accounts, strong passwords, secure session handling, least-privilege roles, and a process for removing access when someone leaves. Administrative functions should be restricted and monitored.
Protect data in transit and at rest where appropriate, keep secrets out of source code, validate input on the server, and avoid exposing sensitive records in logs or URLs.
- Use role-based access
- Require secure authentication
- Validate all server inputs
- Keep dependencies updated
- Record important security events
Plan for failure and recovery
A secure system also needs tested backups, restore procedures, incident contacts, and a way to continue essential work during downtime. Recovery assumptions should be written down and rehearsed.
Frequently asked questions
When should security be considered?
At discovery and design. Data sensitivity, user roles, hosting, integrations, retention, and recovery decisions shape the architecture from the beginning.
Is a small internal system too small for security controls?
No. Small systems often hold valuable customer, employee, financial, or health information and can be exposed through simple access mistakes.
Sources and further reading
Next step