There will be an online interview. The questions are manageable and can mostly be generic, for instance, why do you think you are a good fit, why GS, why Operations? The division-specific questions at the end are a little more tricky however, and will require you to at least research on the current landscape a little. There is only one question for each division applied. Then, it is a wait of a few weeks before you are notified for a rejection or an interview. There are a few rounds of interviews--2 for me. First one is Superday, where you are interviewed by 2 couples of interviews for 30minutes each. It is more or less an introduction of yourself, your resume, your personality. May have some brain teasers. After the first round of vetting, you will be introduced to higher level staff from specific divisions that are doing the hiring (your potential supervisors). This interview is much more fluid. No advice for this part except to prepare why you want the job as much as you can, and be honest with your motivations.