Custom CMS for Client Profiles

This CMS is for a very small company that manages talent (talent agency). I would like to input data on new/existing talent that I manage and I would like a profile-type webpage created from the data/media/content I manually enter into the back-end of my website. Although sensitive information will not be stored into any fields, this CMS should be 100% secure with 0 vulnerabilities. Not injectable and not hackable - at all. I am OK with customization of an open source CMS for this project, as long as it is not WordPress and can deliver what I am seeking, it is scalable, and is (once again) 100% secure. I am seeking a Custom CMS that will allow me to manage my clients on the back-end of my website and have the data (and/or media) I have entered to appear on the front-end of my website. I am also seeking a fully responsive (HTML5/CSS3) barebone framework that is 100% valid (every page; from A to Z) for my content to appear on. I am not seeking a custom webdesign, I am seeking more of a framework that from the back-end (the CMS) will allow me to change header logo images and similar items (such as advertisements). Every edit should spit out a 100% valid code. Features: - Vanity URL for profiles - Talent Availability (new, available/unavailable etc) - Automatic Image Watermarking for particular photos and/or videos (if even possible for videos?) - Algorthym for "new" talent. Any "new" talent should automatically fall under other categories (section) after X amount of days/months/years etc -because they are no longer a "new" client of mine. - Front and Back-end sorting (A-Z by First Name/Last Name, Date Added, etc) - Automatic Meta Title, Description, Keywords (etc) based on every talent's name and/vanity url. - Back-end HTML fields for advertising spots that will appear on the front-end. - Back-end fields which will allow me to enter my own Meta Title, Description, Keywords etc - which will replace the automaticly generated data described in feature above ^^ Now, I would like the front-endto have two barebone layouts. One is the homepage, and the other is the client profile page... This is my first time using such a service like freelancer, that said, I am able to supply more/full details at any time. For now, based on my post... please let me know if you can do this for me. Thank you!