Where to order the design of electronics for modern gadgets for serial production?

Question

Electronics

I apologize if I worded the thought incorrectly or incomprehensibly in some places. Now the project is in the stage of development and analysis, I am a noob in the field of electronics manufacturing.
There are plans to mass-produce several gadgets. Gadgets will work with modern devices. For example, they will use Bluetooth 4 to connect with mobile devices, a wifi access point will probably be raised on this device, the gadget will probably connect directly to mini-usb Android phones and other relevant things. All the elements necessary for the manufacture of our devices already exist on the market, i. it is not necessary to produce new elements for our purposes.
Question: Where can I order the design and manufacture of the electronic part of the trial sample and the module of interaction with the software? Where to look for such specialists or organizations providing such services?
Thanks to everyone who took the time to write this post.

Answer 1

Offhand, Promwad comes to mind . Habrayuzer ashby is directly related to them.
There was someone else but I can't remember

Answer 2

You can also rummage around on electronix.ru, freelancers of this kind also exist.

Answer 3

It is not clear where you are geographically, although I suspect that in Moscow.

Answer 4

We just deal with such gadgets. We can do it, it's not expensive. www.avinel.ru