Why we always found the worst problems 2days after going to production? No matter how we tested?

A wise man once said "No battle plan ever survives contact with the enemy"

Rule 404: Not all bugs can be found by testing

@Minzkraut so, there's a rule 405 that the most crazy ones will be found days after going to production? 😂

It happens. You probably did catch a bunch in testing though. I am an optimist 😀

Release it 2 days after your predicted release date. That'll sort things out

@wellitonpaiva indeed

Recently a vendor we get a token from changed their web service, which broke our single sign on method because we couldn't get the token. Turns out someone pushed code to production instead of non production. You could tell, because the method was HelloWorld.... 🤦