Ask HN: What's the ideal stack for a solo dev in 2025

I’m a marketer turned dev. When I built my first SaaS 3 years ago, I went with ROR because it seemed like the ideal stack for a solo dev.

But with all the development in AI, I wonder, is it still the best choice? Most AI tools have JS or Python integration but the Rails ecosystem seems a bit behind.

But at the same time, a lot of the JS ecosystem feels all over the place.

So what tech stack should a solo dev use in 2025?