WooCommerce + AWS S3 Secure Digital Downloads without Plugin

I am seeking an experienced developer to implement a secure and maintainable solution for delivering digital downloads on my WooCommerce website, which utilizes Amazon S3 for storage. The project requires the establishment of a private S3 bucket with secure, expiring download links that last between 6 to 12 hours. The solution must seamlessly integrate with WooCommerce's digital downloads feature, utilizing either CloudFront signed URLs or S3 pre-signed URLs. A clean PHP implementation using WooCommerce hooks is essential, along with comprehensive documentation for future maintenance. The deliverables include a fully functional implementation on my site, a detailed explanation of the system's operation, and clear instructions for adding new downloadable products. Please provide details of a similar WooCommerce and AWS project you have successfully completed.