Where can I find an electronics engineer to develop a device (Ukraine)?

Question

Electronics

It is necessary to develop (assemble) a device that performs one function:
when a button is pressed, the device must send a message to a web server of the form (phone number, key string)
It must work through a standard SIM card of operators (mts, kyivstar, life) with configured Internet access.
Tell me where to find a person or maybe tell me how to implement such a device yourself?