They say that they're looking for passion and flexibility, but to be completely honest, it doesn't seem like they really know what they're looking for. It's an unnecessarily long process considering that they keep saying they're growing quickly.
My path:
I attended a recruiting event and I actually enjoyed talking with the recruiters - they seemed to truly enjoy their job. Everyone was told to apply online. After I applied, actually thought I'd been rejected because I didn't hear back from them. But 3+ weeks afterward, I surprisingly received an email to do the video interviews. 2 weeks after that, I was scheduled to do a phone interview.
A red flag I should have listened to early on, however, was that my emails for clarification - and even a phone call to their office - went unanswered. So although I thought my phone interview went well, I wasn't especially surprised that I received a rejection email the next day. They keep emphasizing that they're growing, but I don't see how that's possible if their recruiting process is this slow and unfriendly.
Some tips:
For the video interview, just go through all the questions found here and practice answering to your computer (remember to look into the camera, not the screen; think of the camera as your interviewer's eyes). If you practice, it really isn't as bad as people keep whining about.
For the phone interview, it'll be really short - mine was 15 minutes exactly - with disconnected questions and no follow up. It seemed like they were just running through a list of questions. When I asked if there were any concerns about my application, my interviewer said I checked out fine and should hear back within 2 weeks.
The fact that I wasn't passed through tells me 1) my interviewer really had concerns, which says they aren't keen on being open with their candidates despite their touting a culture of open communication; 2) they're looking for very specific qualifications that they're not communicating to candidates; 3) they don't really know or there's no consistency about what they're looking for in a candidate.
I think AlphaSights is doing great work -- but if this is how they treat their candidates, I'm not so sure it'd be great to actually work there.