[euroclydon]

If you already got hired, I would just relax. Get some exercise, find a couple good books [1] you can read later when you want to take your mind off work.

Then, when you start work, pour over the source code. Understand it. Ask or research anything you don't understand. Make a list of things that suck about it -- there likely will be a lot of technical debt, but who knows...

If you want to get ahead, combine working harder than anyone else with the concepts you will absorb by reading The Power Broker [2].

[1] I say a book instead of NetFlix or games, because if you read at night, with a red light, you'll become sleepy and get a good night's rest, but watching TV or playing games will keep you up, and you'll go into work tired.

[2] Don't mistake this book for some self help or business genera, it's page-turning biography by one of the best journalists of our time.

[rue]

Gonna second this. Do something fun, whatever it is. You don’t need to be a hero the first day. Go in well-rested, motivated, and open-minded.

The company pays you to learn their stuff.

[zlnimda]

Moreover, they need you to learn how it works in your future team. And for that you need to work there.

So, that's simple : - First, rest right now ! - Second, when you'll be there, work hard !