Product Demo Reel SaaS Builder

I am creating a SaaS that automatically turns user-submitted assets into short, polished product-demo reels. The service must ingest common inputs (screen recordings, logo/brand kit, captions), stitch them together with clean transitions, on-screen call-outs and background music, then render ready-to-share MP4 or vertical formats suitable for stores, landing pages and socials.

Key expectations
• Cloud-based architecture that scales; a REST/GraphQL API so other apps can trigger reel generation
• Templating logic to overlay feature highlights, animated text and end-cards
• Fast rendering pipeline—FFmpeg, Remotion, or comparable video-processing tech is fine as long as it outputs consistently high quality
• Modern, minimal web UI for users to upload assets, preview and download completed reels
• Deployment scripts and concise docs so I can maintain and extend the platform

Please include links to past work that proves you have shipped similar automated video or SaaS products. I will shortlist based on real examples of previous builds, clean code structure and an eye for smooth motion design.