I was about to simply repost this sentence as its the HEAVY substantial bit of the post.

What does it mean? Throw engineering problems your CURRENT team has solved in the past at new candidates. I have seen only ONE startup ( even among the nastiest of hard problem seekers ) GET how substantial this is. So many of these companies are too busy to think about smart sourcing, at their own peril.

Test new engineers off past solved problems. End of story.