kivy / python developer expert

We are a small software consulting company located in Argentina that developed a small mobile application using the kivy and kivymd library. We are looking for a freelance with extensive knowledge of python, kivy and above all who knows how to work with weak references and the garbage collector. Your job will be to review the application already programmed and add a little of your experience and knowledge in our code, you also have to have enough capacity to definitively eradicate the problem of weak references that although it does not happen often can sometimes happen. We intend to continue working and adding functionalities to our application, so the performance of the worker will be evaluated to take it into account in future necessary developments already documented. Our budget is 50 to 100 USD depending on the skills of the freelancer (it can be more depending on the number of tasks / new functions / suggestions that are accepted and added to the application)