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Would love to see what kind of dev platform/technology you use to build trello, specifically the scaling challenges.

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.

Shared file descriptors are bad mojo.