It is inevitable for some companies to use the latest or specific version of programming languages, or they need to use a programming language that is not in the standard environment. An App engine Flexible environment may be the next best choice. It supports Node.js, Ruby, and .NET in addition to PHP, Go, Python, and Java. The flexible environment provides support for running newer versions of programming languages compared to a standard environment. Applications run in a Docker container in the flexible environment. Scalability for huge traffic is not straightforward nor automatic for applications running in flexible environments because of the way they are deployed using containers.