I have been doing interviews for the last 5 years and realize that conducting a technical interview is no easy task. You not only need experience and competence, but also a mix of other non-technical skills, like the ability to build a rapport with the candidate and the ability to understand his/her train of thought even if not phrased properly.
For companies that need to hire talent, delegating the task of interviewing to a third-party company is great when it comes to technical screening. In my experience, Skilled has a better game than anyone else. Every interviewer is highly skilled, trained, and has years of experience interviewing. Highly recommended.
Engineering Lead @ Snapchat, Los Angeles