This paper contains description of technologies and commonly used practice in the development of distributed Internet applications. First chapter in this paper, contains information and description of Git, which is a distributed version control system that allows easy code tracking and control in development of the applications by enabling easy collaboration on a project between developer teams. This paper also shows different server types, which serve content provided by the applications such as Apache or NGINX. When it comes to the actual practice of code writing and the structure of the applications, this paper describes different kinds of design patterns used to enable code reusability. The paper also describes in-depth frameworks used for easier development and usage of design patterns such as Phalcon PHP Framework. A chapter in this paper is also dedicated to APIs and the description and usage of commonly used API technologies such as RESTful or SOAP. Full-text search engines such as Sphinx and Elasticsearch are also mentioned. The paper also contains a chapter dedicated to cache and various problems which are avoided by caching content provided by the application. JavaScript programming language, and the benefits of using it in generating dynamic content is also explained, followed by the importance and different technologies for debugging and performance measuring. The last chapter in this paper is dedicated to application testing.