James and Peteris are two of the most amazing devs I've seen in a long time. They ship and ship and ship and ship.
The first version of StackVM (Browserling's underlying technology) was written in Haskell. They switched to Node close to two years ago if I'm not mistaken. I've gotten an early look at Testling, their cross browser testing web testing tools, and they're easily a year or two ahead of anyone else on the market. I'm looking forward to seeing it launch.
Hook James and Peteris up by purchasing a paid plan: http://browserling.com/pricing
Better yet, ping them about buying a corporate plan for your company: http://browserling.com/contact