Ask HN: What interesting problems are you working on?

This is a follow up of this thread ( https://news.ycombinator.com/item?id=22174828 ) which got some amazing responses but considering it's been almost two years, It's time for new edition

I'd love to hear about what interesting problems (technically or otherwise) you're working on -- and if you're willing to share more, I'm curious how you ended up working on them. This time, with a twist. Please include web technologies too if it's really niche and not a lot of people know about it