The interview consists of 3 parts: phone (screening), practise test (for an hour) and on-site interview. In general, the article from "highly professional scums" fully describes the process of hiring. However, phone interview is deeper and can take a long time (3-4 hours). The questions are typical for gamedev: C++, algorithms and their performance, memory and types casting, linear algebra and so on. On-site interview is much easier and includes general questions about previous projects and your vision of modern game engines