I wrote a post about this a while back: http://kasrarahjerdi.com/2016/08/on-developer-hiring/

Basically I like job listings that include _specific_ information about the role at the company. Maybe that means listing some of the hard challenges the other people on the team have worked on recently, maybe it just means listing the frameworks and libraries they're using, but anything to help me differentiate their Android role from someone else's Android role.