Multiple different conversations before hand, and then eventually a 3 hour technical interview. 3 separate hour-long interviews. 30 minutes of technical questions each. They asked questions about my resume, as well as technical questions.

Applied online. Two days later, asked to take an online skills evaluation, consisting of 6 problems, for which I had to write a C function. The problem statements were poorly written. The coding was fairly easy, mostly array manipulations. No hard core embedded problems, like bit manipulations. I finished 2/6 problems. 2 of the "fails" crashed their system when tested; the other two "fails", my time expired. If I only had 1 or 2 more minutes on each. Two hours after this evaluation, I got the automated rejection.