The real problem is that they don’t know how to write fast end-to-end tests. Not having solid end-to-end tests is a massive red flag. Also, each service can be

The real problem is that they don’t know how to write fast end-to-end tests. Not having solid end-to-end tests is a massive red flag. Also, each service can be simulation tested in isolation. So even if they don’t have the skills to do end-to-end testing, they could at least do per-service simulation testing, with each service team responsible for running those tests independently.