Make sure you're not the only person who can work with your code. Make yourself easily replaceable, on a project level. Otherwise you will get calls during you

Make sure you're not the only person who can work with your code. Make yourself easily replaceable, on a project level. Otherwise you will get calls during your vacation; you may not be able to work on other projects, switch teams or even get promoted - or if you do, you will still be supporting the code you wrote years ago on the side.