I don't mean to be blunt, but this is a dreamland idea.
Nowadays: experienced developers, always and every time, get HUGE salaries and indeed they get shares, and lots of them. Every time. It's not a "special treat" these days for experienced devs to get options/shares, it's just expected.
If someone offers shares ("but no salary!") unfortunately it would just be laughable, in today's milieu.
I'm sorry to say.
It used to be that if you had - let's say - 200,000 USD cash on hand, you could maybe scrape together a prototype or something. Those days are really gone.
For non-developer-founders it is incredibly hard to get going unless you have 1/2m on hand. And then you need to nail it immediately (3-6 months) and instantly pick up some early funding.
Or it's just yet another facebook-for-cats that goes nowhere and utterly wastes the odd 100 grand.
Just to be completely direct, in this day and age:
unfortunately it is "just utterly inconceivable" that you can hire ("senior") talent by offering "shares" in some app idea. The phone rings hot day and nite with huge cash + shares offers from well-funded projects.