Microsoft

Ask about basic embedded interfaces like SPI and I2C. Discuss algorithms to sort data. Then, ask very detailed questions about the projects I have done before, using C++11 standard library.

The problems are not difficult. Although not all tests are passed, the interview goes well. There are 5 rounds in total, and each round takes 1 hour.

HR is very nice and gives very helpful support. The interview process includes 5 rounds, and every round requires solving an algorithm problem and writing code on a whiteboard. You also need to write some tests to go through your code.