I applied online and didn't get a response for 7 weeks. I had a phone interview with the hiring manager and after I made the top 3 finalists, proceeded to have two in-person panel interviews, followed by a single HR interview at the end. These interviews lasted for 3.5 hours.
Each interview I gave a presentation on their strategy (this was required by the hiring manager). Overall, the questions they asked about the presentation were easy and elementary in detail. However, more than asking me questions, everything seemed to circle back to "F5 is the best place evvvvver" from 4 of the 6 people in the interviews. I was asked in each interview if I knew F5's reputation. (Note: I did post doing research before the interviews - but not before I applied) Since I have a good job right now, it could have been they were "over-selling" F5 to me.
Without too much detail, I found that the group had no flexibility in direction. Because I was asked to do a strategy presentation, and my 15+ years in the industry, I knew that there were issues (legally) with the outlined branding and through SEO market trends, a specific idea would fail. When I explained why I would do x (and not y), I was shutdown and again, told F5 was awesome and they were correct.
In the end, I sent my Thank You's, stay in touch, emails and didn't receive one response. Haven't received a reject letter either, even though I am positive I did not get the role. Even if I had -- I would never have taken it.
I highly suggest that F5 doesn't allow their ego's get in the way of attracting great talent. There are too many wonderful companies in Seattle to work for the wrong one...