I need a lightweight, custom-built web app that lets any visitor paste a YouTube link and either (a) download the video itself in common resolutions or (b) convert it to MP3 and grab the audio. No user accounts or CMS are involved—everything must be coded from scratch. You’re free to choose the stack (Node.js, Python, PHP, Go, etc.) as long as the code is well-structured, documented, and easy for another developer to maintain. The front end should be clean, mobile-friendly, and show clear progress feedback while the back end handles the heavy lifting through tools such as yt-dlp and ffmpeg (or any alternative you prefer) with automatic cleanup of temporary files. Deliverables • Fully functional site deployed on my server • Complete, commented source code and a short setup guide • Simple, professional UI with logo placeholder and color palette The project is done once I can paste any standard YouTube URL and receive the requested file in under a minute. When you respond, please highlight relevant experience building downloaders or media converters and link to any live examples—those details will help me choose quickly.