I reached out to the hiring manager for the roles that they were hiring for and Associate Hardware Engineer was one of them. I had a 30-minute call with the Hiring Manager where we went through my resume and EEE101-EEE201 fundamental questions, they covered the topics of (low pass filters, zener diode basic questions, voltage divider circuits and some KVL, KCL).
Next, I was moved to the more technical interview with the team of 4 people for 1 hour (which went to 1.5 hours). Again some questions on my resume the panel had and they opened a whiteboard session for me to solve. The topics covered were low-pass filter, waveforms, capacitors and bode plots in LPF, then transformer and diode (tricky questions which looked like a rectifier but wasn't since diode was negatively biased and parallel to resistor and there was a load resistor too), then ac and dc voltage play on transformer, working of diode, gave me an inverting op-amp and asked to solve for Vo interms of Vi, op-amp range, role of R3 (going in non-inverting side), ideal op-amp characteristics, how to choose R3 and what happens if its not there, then there was a current distribution question (which I didn't understand at all), Later, they showed me a simple voltage divider circuit but they attached ammeter and voltmeter parallel to the load and asked me what will happen to the circuit, impedance of ammeter, output voltage.
I fumbled a lot on op-amps, although I was able to work through my mistakes and answer properly, I got a rejection mail in a couple of weeks. The next step is an in-person interview though where the ask you to do a 20- minute presentation of your choice then Q&A, and later a day long whiteboard sessions with lunch.
PS: Learn their values (on their website), they love it!