Cerberus interview questions

I applied on a LinkedIn posting. Some days later, I got an initial rejection email saying that they were giving preference to people who were in the area but if I was willing to relocate without assistance then they would be happy to chat. So I replied to the email saying I would be happy to do so. They sent me a coding challenge which they said takes the typical candidate 1 hour which was pretty much how long it took me. There was not strict deadline but the sooner I sent it to them, the better. Then, they would look it over to see if it meets their standards of clean code. It was a small Java project involving sorting a list and also writing JUnit tests. You would then verify that the tests pass using a maven command. It has a pom.xml file so if you're using Eclipse, be sure to import it as a Maven project. They give a little code to start you off. I was rejected a couple days after submitting because my code didn't meet their standards and they recommended that I read 'Clean Code' by Robert C. Martin.