As a seasoned Linux Server Administrator, I have amassed comprehensive knowledge and proficiency in Varnish, making me more than capable of meeting your consulting needs. My experience spans over 4+ years, during which I have honed my skills in areas like CentOS, Debian, Ubuntu, RHEL, Alma, MacOS, EC2, ELB, RDS and many more that perfectly align with essential requirements for this project.
In terms of project expectations in Varnish implementation and cache flow using Varnish and Nginx as you've specified, I'm well-versed in the configuration process and setting up the interaction between both systems. Additionally, my adeptness at conducting rigorous testing and thorough deployment means the final product will be flawless and primed for production.
Furthermore, it's important to note that as a consultant for your project, I will require server root ssh access to perform the task. Looking forward to work with you.