I was first contacted by a recruiter who found my resume in the internal database. I had used this database previously to apply for different Tesla positions.

The process began with a phone interview with the technical recruiter, followed by a phone interview with the hiring manager, and concluded with a phone interview with an engineer.

The interviews with the manager and the engineer were filled 95% with technical questions. Some were "think outside of the box" questions.

What was interesting was that they kept saying they were looking for a PLC programmer, but about 98% of the technical questions were hardware-related and had nothing to do with PLCs. The conversation with the engineer ended with him commenting, "I think you are a decent PLC guy," but he never actually asked any PLC-related questions during the interview. How could he possibly know that I was a good PLC guy? I feel I wasn't interviewed by the correct people.

My general impression is that they invite a lot of candidates to phone interviews and invest significant time and effort in screening them through a series of these calls.

Even if you pass the first few phone interviews, do not get your hopes up too high until you actually receive an offer. After all, the phone interview process itself was quite strange (no PLC-related questions for a PLC position).

You have a power supply that feeds power to three branches. Where would you put your circuit protection?

Are there any disadvantages if you put the protection at all wires (feeder + three branches)?