A F5 recruiter contacted me for an information session phone call, then a phone interview.

I provided two available times. There was no response until the morning of the second available time. After which, F5 rescheduled twice and changed the interviewer. The phone call did not come in until I pinged the recruiter 15 minutes later.

A regular phone interview, mostly knowledge with no coding. The interviewer did not seem to have prepared. I was told the recruiter would contact me in 2-3 days. There was no message.

I followed up after a week and received no reply.

JIT compiler and how it was designed and implemented. I had different opinions with the interviewer on some aspects. He dictated he was right. I did not debate.