I passed all the interviews in a period spanning 6-7 weeks(very slow feedback) and they still did not make an offer. The reasoning behind their non-offer did not make sense, neither to me nor to the recruiter, Unfortunately what seemed like an otherwise interesting interview process in terms of what they are asking turned out to be a major time sink without transparency.

Their management & HR interviews are 2 hours long in 2 separate sessions (don't ask me why) and even if they say you are a cultural fit like in my case (and after having passed 3 rounds of technical interviews before that) they still do not make an offer (or even a lesser offer or anything) - I guess they do not trust their interview process?!

What would you bring to the company that other senior engineers would not?