[betadreamer]

A lot of people here talks about lack of load testing and other "do it the right way" type of advice, but remember this is a startup. In my opinion, solid testing foundation will be such an overkill and the time is better spent on implementing more features.

Also I bet they did some manual testing. They didn't catch it because this latency can only be seen by the account with a lot of followers.

I agree that their first solution to upgrade is a bad idea... You should understand what caused the bug before trying to fix it.

I highly encourage you to monitor the load/pay/request graph on a daily basis. Even better if you hang a screen on the office that displays these. The graphs are already provided by Firebase. That way you can catch these type of anomaly on day one. Also Firebase supports "Progressively roll out new features" https://firebase.google.com/use-cases/#new-features

[whoisjuan]

Lack of testing and poor code quality are completely different things though.