Ask HN: What's the hardest/most interesting thing you've used AI to code?

Personally I'm more interested in technically complex projects, and systems programming more than web apps, vibe coding tools, or MCPs.

What tools have you used? What tips do you have?

For me this would include a couple of fuse filesystems, inter-language bridges, ORM adapter, a good chunk of app/framework code, and a lot of small platforms scripts that I probably wouldn't have bothered with if I had to look up everything instead of using AI. One notable aspect is that I've used a lot of Rust, even though I don't actually know Rust.

I do make sure to understand each block of code if not every line, and more carefully review the tests, which I generally do in a language that I do know. I use primarily aider-chat. Tips would be TDD, systematic design-architect-implement-troubleshoot and propose-criticize-refine loops, and multitasking (tmux) to avoid always waiting on an LLM response.