i need devops to deploy saas web application into high availability

i need devops to deploy saas web application into high availability
i want to make load balancer (2 to 3 servers for our app , 1 server for database + load balancer)

also i want to handle custom domains and SSLs for our customers with caddy server (reserve proxy server) , so client can add his custom domain

currently our app running at aapanel and i want to handle servers by aapanel too with caddy as load balancer server
our hosting provider is : Linode

only experts
i don't need devlopers only dev ops