Don’t wait for the candidate to show up and then start a conversation about an algorithm (or technology or mathematics) that they may not be familiar with haven

Don’t wait for the candidate to show up and then start a conversation about an algorithm (or technology or mathematics) that they may not be familiar with haven’t used in some time. Offer of some topics for discussion before the interview (e.g. Quadtrees, tries, infinity) that they can study, or read a white paper about and have some increasingly in-depth questions, applications and conversations about one or more of these topics. No one is ever expected to solve an unfamiliar problem in a 60 minute meeting. Generally a story/feature with technological unknowns are pointed for several days and are in the developers current wheel house, yet we expect a candidate to use most of their energy and facilities in a social situation with people they’re unfamiliar with and solve whatever random algorithm, riddle or puzzle that you Googled the answer to before the interview.