A Production Checklist

Before the booking service takes its first real booking, a team should be able to answer yes to six questions:

1. Does every environment run the same build, with settings and secrets supplied from outside?
2. Do the four business rules hold when requests arrive at the same time?
3. Does every call to another system have a time limit?
4. Can only the right people reach each endpoint, including the management ones?
5. Can an operator see, from outside, whether the service is healthy and what it is doing?
6. Can the platform start, replace, and stop an instance without losing a booking?