They first emailed to schedule a technical phone interview within a week. The interview experience was very good, even though I did not perform well.

They mainly asked about Operating Systems and C. As I am from an Electrical background, I did not have much knowledge about Operating Systems.

The interviewer provided enough hints on the questions I fumbled. It's an easy interview for Computer Science majors, I guess. It lasted for about 40 minutes.

It started with C questions:

• Storage classes in C
• Dynamic memory allocation
• Binary tree and its time complexity
• Different sorting methods, including an explanation of quicksort and its time complexities
• What is a linked list and its time complexity
• Write the atoi function code using screen share

Operating Systems:

• What is a thread
• Context switching
• Inter-process communication
• Preemptive and non-preemptive processes

And other topics I had never heard of and don't even remember.