Hiring a Microsoft Deployment Toolkit (MDT) developer is beneficial for automating and simplifying the process of deploying Windows operating systems in your organization. They can help create and manage images, and automate the installation process, ensuring a more efficient, controlled, and error-free deployment. Their expertise can aid in reducing IT costs, improving productivity, and maintaining a standardized, stable computing environment. Additionally, they can troubleshoot any issues that arise, ensuring your systems remain up-to-date and secure.