BackendDevOps/CloudAround since 2011
Twelve-Factor App
Also written as 12-Factor App, 12 Factor App
A widely used checklist for building web services that run well in the cloud: config in environment variables, no data stored on the server itself, logs as streams, and so on.
Think of it like
The house rules that let any flatmate move in or out without the whole flat falling apart.
Junior or senior?
Signals cloud-native habits.
Senior sounds like
Can name which factors their service actually broke, and why.
Ask them
“Which of the twelve factors was hardest for your service to follow?”