Fullstack engineer needed in Python/Django, Javascript, with strong emphasis on backend

We are looking for a Senior Full-Stack Python Developer who can handle 100K lines of code. We need to upgrade to Python/django 3 from Python 2. We also need to maintain and cleaning up the code as we grow. - Keep Facebook's marketing API up-to-date - Strong with Backend Development - Also need to work on frontend improvements (but doesn't need to be a focus) - Clean up errors, make test suite fully working