Urgent: Django Developer for Complex Debugging

We have an existing Python/Django application that requires an experienced developer to investigate and fix several backend issues. The issues are not straightforward UI or CRUD bugs. They involve existing business logic, API behavior, database queries, model relationships, and unexpected edge cases. You will need to understand the existing codebase, trace the actual source of the problems, and implement proper fixes without breaking the current functionality. The work may involve debugging Django views, services, models, Django REST Framework APIs, PostgreSQL queries, transactions, and background processes. We are looking for someone who is comfortable entering an unfamiliar Django codebase and doing proper root-cause debugging rather than applying quick workarounds. The initial task is focused on fixing the reported issues, testing the affected functionality, and providing a short explanation of what was changed. Please apply only if you have solid hands-on experience with Python/Django debugging and existing production-style codebases.