AT&T

It took a very long time, but the hiring managers were very nice. First, I applied online. Then, it took about two months for them to get back to me. I then had three phone screens: the first was behavioral, and the next two were background checks.

A brief written test on object-oriented programming and experience. Some written test on hypothetical critical thinking scenarios. The interview lasted about a couple of hours and went relatively smoothly.

Multiple rounds. For each round, you're progressively getting deeper into the title and show your knowledge on the topic or role at hand. Be able to talk about prior projects.