As a seasoned Backend Developer with diverse experience in Node.js, PHP, Apache, and overall web hosting, I am primed to handle your Linux server project. Over the past 5 years, I have consistently demonstrated my ability to tackle complex projects like yours - which require careful port configuration and handling of Websockets.
More notably, my fluency with Cyber Panel and its prerequisites is tailor-made for your needs. I understand the importance of a secure and properly configured firewall. And trust me - I wouldn't compromise on this aspect. As an added advantage, my deftness with MongoDB can even contribute to enhancing your system's performance if need be.
In conclusion, my extensive backend development experiences incredibly align with your project's requirements. Not only can I get those ports open for Cyber Panel but also ensure a top-notch Websocket functionality check – leaving no stone unturned in ensuring everything falls perfectly into place. So why go through the hassle of vetting sub-par offers when you have a prime candidate right in front of you? Let's get started!