[djmckee]

Learn the stack they use, play with it, make sure you understand it. Also, find out what version control system they use and get comfortable using it - source control's vital stuff when working in a team and something that you may well have not really used so far in CS.

[mardurhack]

Thanks, sound advice! I have already some experience with most of the tools they use but I was wondering if I should focus more on doing, e.g., programming challenges on sites like Top Coder or complete tutorial after tutorial about the stack. They use git by the way and I have been using it for a while now.

[rhodysurf]

eh you already got hired, I would relax. Its not like they expect you to start and already know everything. Plus, take time to be away from a computer before you are locked into one full time.