Consider also that from a technical point of view, you prbably don't and will never need a big investment in technology anyway. Build as little custom software as you can because it's expensive to build and even more expensive to maintain (there is no such thing as a "done" phase). Have someone on payroll that can learn the business and it's users and customers that can gradually iterate.
Feel free to contact me through the email on my HN profile. I'm not looking for work, but I've been a first-technical-hire and/or CTO several times, and I could probably chat about this for an hour on the phone (pro bono, of course).
They might not be the top 1%, 10x value developer you need right now, but in 1 to 2 years they will be.
Good places to look are local startup hubs and AngelList.
Honestly, this is a hard problem that lots of people face. There's no silver bullet. They'll solve the problem more quickly if they're willing to part with more equity, though.