Developer File Transfer/sharing Platform - WeTransfer

Required developer with skills in:
PHP, MySQL, JavaScript, AJAX.
Creating Chrome extension, in particular.
Using cronjobs.
Knowledge of uploaders, optimization time database, simultaneous recording of large amounts of data and creation of shortened URLs.

Attached is a. PDF with some data that is required to do.

I will explain a brief summary of the idea. Basically it is a system to upload files and share them quickly. Especially for companies, freelancers or virtual chats between friends.

Required to do something similar to WeTransfer (guest system, emails, advertising line, invalidating files) with mixed MinBox (short url, extension and users), buffer (extension).

Currently has a small script already designed:
The script is
The uploader that uses the script is

Do the project again from scratch or work on what is created.