[kevingessner]

The team wrote a blog post describing their tech stack last year: http://blog.fogcreek.com/the-trello-tech-stack/

The biggest change since then is that Trello now runs on AWS, rather than colocated servers in NYC. But the software is the same.

[dodger]

. . . and here's an example of an issue with scaling it up: http://stackoverflow.com/questions/13770826/poorly-balanced-...

[tedunangst]

Shared file descriptors are bad mojo.