Comment by nslindtner

Very simple input, but they have served me very well :-)

1: Make sure you have development and test environment available (including data transfer from prod -> test)

2: Source control and Easy deployment (to all environments)

3: Map the code into importance. (not all code is equal).

4: If possible spend time with the main user / product owner (especially in peak periods). You're blessed to have users, who understand your system.

And rember code that has been live for 3 years have earned a lot of expirience

PS: Typescript +1