I'm happy using Ruby and Python and have built sites with Rails and Django in the past. These days I mostly use Flask (sorta like Sinatra in Python) as its ligh

I'm happy using Ruby and Python and have built sites with Rails and Django in the past. These days I mostly use Flask (sorta like Sinatra in Python) as its lightweight and has templates that don't drive me insane (sorry Django). For a large app with lots of models and mixed developers I would likely choose Rails.