Someone to take care of of backend in python to connect to OpenAI api and existing front end.

I am looking for an experienced freelancer to take care of the backend in Python to connect to the OpenAI API and our existing front end. We have an existing front end that the freelancer should connect to. The freelancer should have experience with user authentication, writing models and saving the data as this is a key feature we need implemented in the backend. We are looking for an intermediate level of experience with this type of work and need someone to take on this project as soon as possible.