Hiring an ABAP-OO developer is beneficial for managing SAP systems. With their expertise in Advanced Business Application Programming Object-Oriented language, they can create efficient, scalable, and robust applications. They can enhance your system's performance, optimize your business processes, and provide personalized solutions. Their skills in object-oriented concepts can help in developing complex applications with ease. They can also easily debug and maintain existing ABAP applications, ensuring smooth business operations. Thus, an ABAP-OO developer can be a valuable asset to your team.