Are you looking to modify 75+websites ?
That's a big project !
Seems like there are 2 very different parts to your needs.
(1) hard core coding changes /addons.
(2) deployment of sites, including requests in (1).
(1) = time consuming, higher risk, expensive.
(2) = relatively easy.
You might want to break up (1) ? It seems like quite a large task ?
Alot of people here could do (2).
I guess (1) is going to be so expensive, whomever does (1) probably could "throw in" (2) for free.
I guess the hardest might be ...
- Integrate Verification System (Third Party)
- Integrate Ecommerce System (Third Party)
- Integrate Escrow System (Third Party)
- Integrate Custom API
Modify Forum Layouts Per Forum (Jaxel is good at that).
Custom Skins / Integration w/ Third Party (Bambua is good at that).
There are lots of good coders here ... but finding a good, reliable, full time Xenforo specialist might be hard.
It might be better to find someone with a proven track record at delivering on this type of project ... and get them to learn how Xenforo works.
Let us know how your search goes !