Everyone was very polite and nice, no stress interviews, no nitpicking about wrong API function parameters order etc. First there was an interview with a recruiter, who asked a couple of technical questions prepared by the hiring manager, then there was a phone interview with the hiring manager himself and we used Google docs to write some pseudo-code.

Then I was shortlisted for a face-to-face interview and ARM was very kind to pay for my travel and accommodation. The face-to-face interview took over 3 hours and went very well (as I thought) but regretfully they failed to realise that I was a good match for the position and rejected my application in a couple of days after the interview.

• What criteria would you use when choosing an MCU for a project?

• What means of saving power in an MCU-controlled board do you know?

• Draw a block diagram of an MCU. What's MPU is for. What's the difference between MPU and MMU.

• What happens after power up and before main() is entered, what has to be done?

• Write an in-memory string reversal function (byte-wise and word-wise).

• Describe how would you write a program that transfers bytes from UART to Ethernet (UDP) and blinks a LED, provided there are some API functions.

• What API would you create for working with a DMA controller?

• What is 'undefined behavior' in terms of C language standard.

• What for is the 'volatile' keyword.

• What is your best trait?

• What are your 5 worst traits?

• Why do you want to work for ARM?

• Why you are the one?

• If you don't agree with your immediate boss on some technical decision, how would you address that?

• Have you ever shouted at anyone at work?

Some other questions as well, don't remember them all.