Always remind yourself that security is the most important thing. It’s important because the impact of security breach is more severe than anything else.
Risks have to be measured by the impact when that happens, not how likely it happens
Don’t break stuff
When backend breaks, everything on top of it will also break. Always pay attention to keep the backward compatibility.
Backward compatibility for the win
Don’t merge PRs at late night
You have much weaker cognitive power than you believe at late night. Merging PRs with the weak cognitive power will likely break the principles noted here. This is also important because you can’t test the consequence of your changes until next morning.
Merging PRs at Friday night is a terrible thing to do
Never drink during working
This is too obvious to be warned :)