Welcome,
I'm a software developer with a master's degree in mathematics. I've co-founded two startups (both failed, two different reasons), worked at a tech consultancy, and looked into another niche. At the moment, I work independently on client projects, from design and fullstack dev to serving as a fractional CTO for tech startups.
I was actually just planning to post on substack, but because they have no support for syntax highlighting, I had to have my own place to post.