Someone wrote about Bending Spoons' history and playbook:
https://www.colinkeeley.com/blog/bending-spoons-operating-ma...
I enjoyed this part:
No On-Call Rotations: Bending Spoons aims to build systems so reliable that they eliminate the need for on-call rotations. This is unusual in the tech industry, where on-call duties are standard to promptly address system issues.
For most of their products, they have no on-call schemes at all. Engineers are encouraged to think through all corner cases to ensure robustness, knowing there is no fallback like an on-call team.