We are building something awesome around mobile commerce, trying to connect the people who make products directly with the consumers who love them.
Our current stack is Go (all our backends are in Go), PostgreSQL, AngularJS and ObjectiveC and we picked them thoughtfully because they are the right tools that will help us move fast and build high quality products.
I was at Google for 5 years building the google finance charts, gmail's multiple inboxes, some maps infrastructure, and the like. My co-founder was at Fab for a little under a year. We have a fantastic team - http://jellolabs.com/team - are seed funded, and growing quickly.