As one of the leading freelancers in the platform, I can provide exactly what you are looking for. My team and I have extensive experience with PHP and Joomla, especially in debugging software and resolving complex errors, such as the one you're currently facing. Moreover, we have upgraded several Joomla sites successfully in the past, ensuring their full operability.
Our versatility extends beyond PHP and Joomla. With proficiency in CSS, HTML, MySQL and other relevant technologies, we ensure that everything works cohesively during an upgrade process. Additionally, my understanding of SEO standards will guarantee a seamless transition without any adverse effects on your website's visibility.
One thing that sets us apart from others is our commitment to client satisfaction. We realize your project requires not only problem-solving but careful testing to ensure everything functions perfectly after every change. My team works collectively to make this happen and provides continued support post-project delivery. With free unlimited revisions and updates, technical expertise, timely delivery and competitive pricing, I am certain you won't be disappointed if you choose us for this project. Let's work together to bring back optimal functionality to your backend!