Look for a job in Sales and Trading. Bulge bracket banks love programmers and quant types for trading. It's hard to get an interview by just applying on a website, so you'll want to reach out into your network and see if you can get someone to pass your resume to HR.

A couple of websites that are helpful (though geared mostly towards undergrads): http://wallstreetoasis.com http://mergersandinquisitions.com