User engagement means how much a person uses an app and stays interested in it. It's super important for developers to give users good reasons to keep using their app. In mobile marketing, a big goal is to get more people engaged with apps. This can be done in different ways like sending them emails that they're interested in, making content that's just for them, and trying out new marketing ideas.
SonarQube is an open-source platform that allows you to continuously inspect and measure code quality as you develop your project. It provides static code analysis for code issues, security issues, and code smells in various programming languages, including Swift. This helps development teams maintain and improve code quality by identifying and finding issues in the development lifecycle, if paired with a good testing methodology it can make a difference in your app quality.