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There are a lot of moving parts, but these are separate sub-systems with well defined boundaries of interaction. Each sub-system is implemented using technologies selected for specific characteristics.

Mono for long-running and complex backend processes.

nginx, PHP, MySQL, memcache - for presentation - quick!

node.js provides an event bus between PHP and Mono

MongoDB is taking over from storing large blobs of JSON in MySQL.

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Makes sense.

I was on the opposite side of things, when I did we last. I had language integrated into the web server, and I wrote my own caching primitives. All optimization went into the request handler, and optimizing a single function is easier than debugging a whole stack.

A decent solution, but it had no massive inputs, so I slept better at night knowing it wasn't being tested.

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