1-2 hour interview, if you can't know the person in that time then you suck at interviewing. During that you can ask some conceptual problem solving questions,

1-2 hour interview, if you can't know the person in that time then you suck at interviewing. During that you can ask some conceptual problem solving questions, resume questions. Please trust the resume, if you find someone lying you can fire them. Another is just give them 1 day to solve what you want them to do in real life. Some of the companies already do this.