Refining and maintaining a web application on PHP 7, Laravel (Lumen)

Good afternoon!
We are looking for a programmer who will refine someone elses code (fix the accumulated bugs) and will carry out further development and support. All further developments are related to AmoCRM automation.

There is a small integration of two systems for internal use: AmoCRM and Textback. Works through webhogs, written on Lumen.
Be sure to know PHP 7, Laravel (Lumen).

There is an opportunity with the previous programmer to conduct an online tour of the code (he can no longer deal with our application, but he is in touch).
Theres a tester in the state.

Please dont bother those involved in "crM implementation" without programming!

Budget is difficult to determine, we can work with hourly pay, if you are interested - write, discuss in more detail!