Ask HN: What is the architecture of HN?

I'm not sure if this is what you meant by 'architecture', but Paul Graham [1] describes writing the first version of HN in a dialect of Lisp called 'Arc' [2].

An old version of the code appears to be available on GitHub [3].

[1]: http://www.paulgraham.com/hackernews.html [2]: https://en.wikipedia.org/wiki/Arc_(programming_language) [3]: https://github.com/wting/hackernews