It is a tough one but well worth it. LinkedIn is very detailed in the hiring process (at least the team that I was applying for). Hiring screen with recruiter, then 45 w/Hiring Manager. At that point, if you proceed, you are given a case study to complete - and sometimes more. Present case study to another leader, then panels (usually 3 individuals for 30-45 minutes each). If you then move forward, you would meet with the executive sponsor. They are really great to work with through this process though! They give you a lot of information about the company, the team, and structure to ensure you are prepped for each stage of the interview.