Hi,
I have reviewed your project requirements and I am interested in helping you work on this project. I am confident that this is a project right up my alley that I can complete for you within one week. I have over a decade of experience working with the full LAMP stack (Linux, Apache, MySQL, and PHP), as well as experience with HTML/HTML5, CSS/CSS3, JavaScript, and jQuery. I have built both backends and frontends, created static/dynamic pages, and themes and templates, based on designs that were given to me. I've been working at least 5 years as an Independent Contractor and Web Developer for a company called Boomdizzle (a social music hip hop website).
For this project I will use PHP and MySQL. MySQL will be used to store information, such as user login info, the databases assigned to users, etc... There will be a form that lets them log in, and then there will be an interface that they can use to show what files they have access to and download the files. The download link can be random and will automatically expire after a certain time. Only that user who is logged in and initiated the download can use the link.
My Resume, and full skillset, is available on my profile, as well as reviews from past clients (all of them positive). Let me know if there's anything else you want me to provide, such as examples of my past work (portfolio). I look forward to discussing further with you about this project. Thank you for taking the time to consider my bid.