Internal developer portals (IDPs) have become essential in platform engineering to enhance developer experience, productivity, and retention amid the complexity of modern software development. IDPs serve as a curated set of tools and processes that enable developers to self-service their infrastructure needs, thus reducing cognitive load and allowing them to focus on coding. By providing a centralized platform with standardized tools and automated processes, IDPs streamline operations and improve collaboration between developers and DevOps. Large organizations, in particular, benefit from IDPs as they manage extensive software architectures, ensuring compliance and reducing operational overhead. IDPs also offer qualitative and quantitative benefits, such as improved developer velocity, reduced technical debt, and enhanced service maturity. They provide a customizable abstraction layer that aligns with the unique needs of different organizations, facilitating a shift-left culture and promoting efficiency across engineering teams.