With over 10 years of experience in front and back-end development, I am confident that I can quickly and effectively fix the issues you are experiencing after upgrading your PHP version. My proficiency in PHP, JavaScript, and MySQL gives me a deep understanding of the inner workings of programming languages and allows me to easily identify and rectify any compatibility problems that may arise from version upgrades.
Furthermore, my vast skill set extends beyond just PHP. I am well versed with prestigious frameworks such as Laravel, Yii2, CakePHP, CodeIgniter; all can be employed to strengthen the security and robustness of your code. My proficiency in CMS, including Prestashop; reflects my ability to seamlessly integrate applications with diverse software systems.
As you mentioned on-the-spot communication is your preference for this project, I reassure you that you will always have real-time visibility of our progress and we can promptly address any concerns you may have. With my dedication to delivering high-quality work in a timely manner and round the clock support, I can help restore your site's functionality swiftly without compromising quality. Let's get started and make your site fully operational again!