AWS server setup for Magento 2 site

we have Magento 2 site which is hosted on AWS, we need somebody to look into this and make sure its setup correctly and advise us. Magento is a feature rich and resource heavy system, In order to run Magento in a proper way we have to implement a proper caching system with separated RDS. Proposed Technology Stack : Nginx - PHP-FPM - Varnish - Redis - elasticsearch on a multi server architecture. Varnish Cache Varnish Cache is a web application accelerator (also referred to as an HTTP accelerator or caching HTTP reverse proxy). Varnish stores (or caches) files or fragments of files in memory; this enables Varnish to reduce the response time and network bandwidth consumption on future, equivalent requests. Unlike web servers like Apache and nginx, Varnish was designed for use exclusively with the HTTP protocol and handles more on homepage , cms pages , category etc so the web servers can deal with more checkouts. Redis Cache Redis is a high-speed backend cache with full cache tag support and no need for low-level file system cache. Its performance is stable for high traffic Magento stores. It is also highly recommended in multi-server environments. Aws firewall / Security Automation AWS WAF gives you control over how traffic reaches your applications by enabling you to create security rules that block common attack patterns, such as SQL injection or cross-site scripting, and rules that filter out specific traffic patterns you define , Security Automation Stack Attached below. DB & File backup For Disaster Recovery ElasticSearch ElasticSearch everything is indexed (It indexes everything in the document to make the search faster). Therefore it provides speed search operations across large data sets. ElasticSearch is commonly used to build search engines because it is optimized for it. ElasticSearch is built by targeting speed and scalability Test Environment One Test Environment will be provided for QA before going live Lambda image resize(Optional) AWS LAMBDA implemented image resize with AWS CloudFront, Amazon API Gateway, S3 and AWS Lambda. CDN Content delivery network (CDN) refers to a geographically distributed group of servers which work together to provide fast delivery of Internet content.