I was initially recruited via LinkedIn after my resume was reviewed and was noticed for experience at a large consulting firm. I was brought in for an initial interview and asked for 180 references and then set up on 3 subsequent interviews, all at client sites (I offered to meet the interviewers, since I was mobile and unemployed at the time. They were very willing to meet me wherever I was available, however). My first interview was with a consultant, and we discussed day-to-day operations and expectations for an incoming consultant. He was very upbeat, engaging, and enthusiastic. He was inquisitive without being prying, and it felt very much like a discussion and a 'getting to know you' session rather than a formal interview. My next interview was with a project manager and felt more like a formal interview. I was asked about my previous experience and my take on business problems (how would I handle a difficult client, unexpected situations, personal issues with coworkers, etc). He was more direct and business-like. They asked the next day if I could move the third interview back to their offices, and I found out that they were interested in making an offer rather than need the third interview. After reviewing their package and discussing terms (there was little/no room to negotiate, and the package had already been slightly above my expectations) I accepted.

Relatively straight forward interview process, it included conversations with the recruiter -> senior consultant -> senior manager + case study -> Director. Roughly took about 3 weeks in total, the second half was in-person at their SF downtown office location.