yandex.ru website has vacancies zone. Filled up answers for the questions there. They have sent me a test task. After I have completed it, I had Skype interview where they were asking basic questions about my background and some basic questions about Objective-C and iOS-related things. On the final on-site interview they did ask some deeper questions about iOS, background and some tricky tasks on multithreading.

The interview process consists of several consecutive stages: screening, coding stage, algorithms stage, optional stage with discussion of architectural approaches, face-to-face interview and receiving feedback from the company and listening to your feedback on the selection process. Also at the last stage of the interview, goals for career growth and the creation of conditions for growth are discussed.