Landing page website for a mobile app

I am looking for an experienced freelancer to create a landing page website for my mobile app. The goal of the landing page is to showcase the unique features that are not found in other apps. Furthermore, I am open to different design concepts, so creativity is essential. I need a freelancer who can take the existing content and create a website that showcases the features and benefits that my app has to offer. The freelancer must also be capable of coding the website using HTML5 and CSS3 so it complies with W3C standards and is optimized for different platforms. The key features that the freelancer should include are: user-friendly interface, innovative functionality, and unique features not found in other apps. Once the landing page has been created, the freelancer must also provide assistance in making any changes or updates that are necessary. With this project, I am looking for someone who is creative and experienced in building engaging websites that can convince and convert visitors into users or customers.