One short phone interview, one onsite, and one additional phone interview followed by no response at all. Seriously, none. I emailed my recruiter thrice after the last phone interview to ask about the status and received no reply. This is extremely unprofessional.

The interviews themselves were easy. They were standard SRE interviews that tested broad subject areas. Nothing was particularly challenging or out of the ordinary.

Respecting the NDA despite their total lack of respect.