The biggest one I'd recommend is "find a mentor." And I don't mean a manager (unless you're going on that path), but rather a technical leader that you can meet with once a week to month whose opinion you value and can provide you honest feedback on your work.

You should plan to drive these meetings; count on them only to show up, drink coffee, and answer your questions. If it is not your most valuable hour of the week/month, you either have the wrong mentor or are handling it wrong.

And if your company does not have such a mentor, you should either look to find one that does or make sure you're getting paid well.

Author can also follow up with me via e-mail if they want Stanford-specific advice. There are a specific set of things that the perfect-A average and BS+MS degree in CS in 5 years crowd runs into during their first few years out of school that I'd be happy to share. It's true of every school, but we had a lot of experience with the A students from Stanford, Yale, MIT, Princeton, etc., and they all seemed to run into the same problems as their alumni forerunners.