Solo, self funded and profitable. I work on it while traveling around Asia.

Agree with patio11 there's probably way more than would speak up here. I seldom contribute to HN or the bootstrapping forums mentioned in another reply. I browse a little, but 99% of my time spent in front of the computer is spent working on product or replying to customer emails.

How I got started:

I've built SaaS apps before but they were the dreaded "solution looking for a problem" type.

Then I decided to do things strictly the Lean way. Got out of the building. Talked to customers about an idea I had. Pretty soon I discovered an adjacent problem that everyone had, that sounded fun to solve, and that I had specific domain knowledge in. I built and launched my MVP in one month, from a beach in Koh Samui. I've been traveling ever since then, spending each month in a different country.

Charged from day 1. Had paying customers from day 1.

I find changing my environment enables me to compartmentalize my work better - like I try to get major new features rolled out before I head to my next destination.

Not planning on doing this solo forever. Not ruling out hiring some help down the line and maybe a permanent office somewhere.

But for now it's pretty fun the way it is!