I was approached by one recruiter and asked to fill out a questionnaire and send my resume. The questions were all experience-based; nothing technical.

Then I was approached by another recruiter who wanted a phone interview a week later. The phone interview was fine, with all the normal questions:

• What languages do you program in?
• What is the most difficult bug you have tackled?
• What do you like/dislike about your current job?
• etc...

At the end of the phone interview, I was asked a series of technical questions that were moderately challenging. However, I missed one on threading and was asked another that I don't remember because I did not clearly understand it.

Despite my experience developing and maintaining enterprise applications, this was a problem for them. Roku is looking for a very particular type of engineer; your experience is not going to matter, only your ability to give book answers to language framework details and OOP concepts.

None were that difficult. I was just kicking myself for not studying more before the interview.