The HR phone interview was first and took about 30-40 minutes. They asked questions not only about my CV but also about some data structures and algorithms (DSA) concepts. Most of these were discussed in the book "Cracking the Code Interview".

About one month later, the phone interview with a local engineer was held. It took about 1 hour and included two coding problems. One problem was a very easy math problem taught in junior high school. I can't recall the details of the best solution, but I still solved it, though not optimally.

Phone interview with HR: basic DSA concepts.

Phone interview with engineer:

• One array problem
• One math problem