How I Built a Secure File Transfer App with Django, ClamAV, and Cloudflare R2

I recently launched TransferSecure, a file transfer platform built for sending large files to clients and collaborators without forcing them to create an account. Here is a breakdown of how it works under the hood. The Stack Backend: Django 6 + Django REST Framework File Storage: Cloudflare R2 (S3-compatible) via boto3 Virus Scanning: ClamAV via pyclamd Task Queue: Celery + Redis Database: PostgreSQL Frontend: Django templates + Bootstrap 5 + vanilla JS The Upload Flow The browser never uploads