Build a HIGHLY SECURE website for me!!

Hi people, I want someone to build a website for me that is highly secure. Secure in the sense each user must have security that their contents cannot be viewed by others. I will provide more info to selected bidders. I want this site to load quickly and it must function on mobile also. I need a feature that could help users store videos in their account. The video file should undergo compression and should be in a format that is memory efficient. The main page is strictly not like a social networking one. I want the website to be built in strict Search Engine Friendly. You need to inform me what you are going to use to build a site like this (in your PM). Provide your options. Don't just send "more details pls". If I like your methodology of what your are going to use. I'll surely PM you more details. Give your best package price. Pls state your bids clearly because I will go thru every PM. If you have any doubts or if you are not clear with any of the above stated, place your doubts in the PCB. The base for website is ready, features are being finalised. So, I'll select someone within December 16 for sure. The winner would get a chance to service the website for its lifetime.