[mooreds]

Only one data point but I interviewed with Toptal a while back. They really focus on algorithms at the interview. I understand why--it is a scalable way to rate software developers. However, many many software problems in my experience don't require knowing how to implement algorithms, but rather which libraries make sense and an ability to map business problems to software solutions.

So, in short Toptal seems like they do some good screening, but may be optimizing for a certain kind of developer.