Website Configuration

We are changing hosting company. The website is vast with many subdomains. It has a WordPress blog. rest is mostly simple HTML, PHP, JAVA, etc. The whole is already transferred to the new server. The task is to make the shared website entirely up and running on the new server. The server is Linux. DNS has not changed yet. We will change it after making sure that the site is running flawlessly on the new server. We are looking for someone who can help us. We are looking for a developer who has the knowledge and proven experience in successfully transferring websites, WordPress, server configurations, Linux, HTML, and PHP. The project winner will make 100% sure that the website is running at least as well as it is running on the current server. The developer will be paid only after the DNS transfer and making sure that the website and all its subdomains including WordPress are running flawlessly.