Engineered a WebRTC peer-to-peer video and file-sharing system via Django Channels for signalling, achieving <300ms connection setup across 2–5 concurrent peers in production. Deployed to AWS EC2 with Nginx as a reverse proxy, offloading file storage to S3 and persisting user data in RDS PostgreSQL, resulting in a fully cloud-native, live production app. Implemented chunked file transfer with integrity validation, eliminating corruption errors from an earlier blob prototype and enabling reliable transfers of files up to 50MB on S3.