HackerRank Online challenge given to take in a week. Can't say much more because I couldn't solve the challenge all the way, but all I can say is prepare well for coding challenge.

I applied through Linkedin. They had initial phone screening followed by two phone interviews. The entire process took 2-3 weeks. All the questions were based on web security and cryptography. Its good to know some concepts on OAuth. Many others were from your resume. The role is focussed more on application security and pen testing. Code reviews will help you a lot.