Architecture retainer
A principal engineer after the launch
After the rescue, someone still has to review the next migration and answer the incident. This is that seat, part-time, with a written hour cap.
20 hours a month of senior engineering time
Pull request and schema review
Incident help inside a four-hour window
Dependency updates and a monthly engineering note
Slack or Discord channel with the people doing the work
Not a substitute for a full-time product team