The code structure is very neat, easy to understand with its readable syntax. It has some useful features like routing system which helps us in building our application easily without writing any extra lines of codes or dependencies manually etc and it also supports all major programming languages such as PHP 7+, Python 3+ Ruby 2+. I have used this library only once during my career but i do really believe that we can use them again when required due their flexibility. We are using koa-router package here so no issues related to authentication/authorization were observed while integrating koalaframework into the project.