Good Evening Sir,
Here is Michele Cimmino from Italy and i'm a graduated software architect and full stack web/mobile developer, consultant, project manager, owner of an individual firm.
I can provide you an object oriented, modular, cross-browser/platform and cutting-edge approach according to the principles of the software engineering, in the software architecture and in all solutions delivered for your project.
I'm available 16/24 hours and 6/7 days, i can speak english and I understand a little of german.
Basically there are 2 ways to proceed in this transaltion: we can remove the CMS (wordpress for instance) and recreate the website using latest HTML5 native technology otherwise we can keep wordpress ( i do really suggest this one ) and make a renew maintenance intervent on the code to let you have the latest technology in your wordpress website.
prev works available on my portfolio https://www.freelancer.com/u/Neferius.html
Let's schedule a chat to discuss further.
Best Regards
Michele