The reality is that they built and rebuilt several "enterprise" applications and pieces of technology. At one point it was a API based database, and then an application, and the latest iteration was an ATS built on top of their proprietary database. No one at their company could tell me what they actually did because there wasn't an aligned vision from their management. Alas, they had senior people formerly from VMWare and Diane Green at the helm. The company existed for roughly 2 years and wasn't able to actually produce customer working software from what I could tell. The acquisition was a straight up acquihire to get senior enterprise software folks on board to help build Google's presence there.