Healthcare has been the work for over a decade — long enough to find both the obvious problems and the quieter, structural ones. The next domain that feels under-tooled in the same way is financial health. That's the bet behind Sieve, and probably most of what's next.
Stack is a means. The problem is the point.
I work in Python(Django) and React/React Native today; earlier chapters were TypeScript(and Nodejs for a short span) and Java. None of it matters very much in isolation — they're tools for whatever the problem turns out to need.
Away from the screen: a father first, with (forced) gym time and the occasional game when life allows. Both, it turns out, are good practice for the day job — long games, compounding effort, and paying attention to the things that quietly add up.