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Is it a Microsoft stack all the way down or are there parts of the codebase that are written in other languages? In my mind, when a company gets big enough you usually get different teams writing in different code bases if it fits into their problem domain better.

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There are several codebases now, yes. The main Q&A and Careers sites are C#. We have other projects in Node and Go as well.

(We also rely on Redis, HAProxy and Elastic Search on non-MS platforms.)

That's cool, I never knew Stack Overflow was using Node in production.

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