In addition to asking them to write some code, we also have each member of the team interview them onsite to get a sense of how they'd interact as a member of the team. The challenge does take a few hours, which is longer than a typical phone screen or single onsite interview, but because it lets us focus on getting to know the person onsite rather than go through a gauntlet of whiteboarding interviews, we think it actually saves time for everyone and is a win-win. Obviously, every candidate is different; we think of this not as a rigid template, but a better default option than whiteboard interviews. Thanks for your thoughts!