Met an external recruiter and talked with her for an hour. The interview went well and the recruiter said she would present me to the company. Never heard back from them afterwards.

Applied via ad on LinkedIn. Initial interview with the hiring manager went well, led to another interview with a panel, mainly questions about my experience and what I would do in certain scenarios. There was also a quick coding test to identify bugs code on a sheet of paper. A third interview was conducted by an external company. The external company first had me perform a series of IQ/logic tests and then we had a very thorough interview. The entire process took about two months.