Hello There,
I have good experience with Nginx to use it as Load Balancer, Cache Server and especially used as a Reverse proxy web server with Apache and Apache Tomcat.
I've worked with Nginx in high-scale levels too (Hosts +20,000,000 requests per day). If you're interested Please send me a message and I'll send you some of my past works with Nginx (Network diagram and architecture).
Best Regards,
Daniel Gordi