This company had me do an initial technical screen (2-hours of work) and expressed great interest in the work I did. They asked me to complete a follow on "work sample" which I promptly completed with extras (error handling, specs, etc).
After completing the work sample (a non-trivial amount of effort), they suddenly decided they weren't interested in me. I hadn't even talked with a person and they went from being "extremely excited" to "uninterested" after getting me deep into their process.
Apparently, the recruiter was pushing me through the steps and the technical team hadn't even looked at my resume - or even considered it worthwhile to schedule a call with me.