Awesome. A lot of places do things the way you used to do them, with one system that is the A/B testing source of truth and then crufty glue code to pass things back and forth to that system. Great to have more options for folks who don't want to do this, especially as heterogeneous architectures are only going to get more common going forward.
This is <i>exactly</i> what I've been looking for. Ever since Google Website Optimizer went away, I've been kinda floating in the wind when it comes to UI testing. Major props to SeatGeek for releasing this so that others can use it.
Or you can use ABalytics: no backend, just use Google Analytics :) <a href="https://github.com/danmaz74/ABalytics/" rel="nofollow">https://github.com/danmaz74/ABalytics/</a>