Thorough and leveled analysis of work history and screening for fit. The time from application and referral to actual first connection with recruiter was around a month. (Backlogged work these days) A third part recruiter connects first and they help to grease the gears to see if it's a match from each end. Then they put in to connect with manager of department and the next interview is conducted to feel out the general position and discuss overall background and person and overall company and position with the resulting pay and benefits. Then there is another formality to meet and interview with other coworkers in that department to feel out the overall fit even further.