I built a production - ready Video Downloader service and I can build one for you. This isn't a tutorial project. It's a live, deployed system handling real requests. Backend ASP. NET Core 9 Clean REST API architecture JWT auth via device fingerprint (SHA - 256) zero passwords, zero stored credentials Supports YouTube TikTok Instagram Facebook SoundCloud Spotify Quality options 2160p/ 1080p/ 720p/ 480p