PennyMac is seeking a Senior AI Platform Engineer to design, build, and maintain Windows-based AI infrastructure and tools that support machine learning models and applications. The role involves collaborating with data scientists and engineers to deploy scalable AI solutions, optimizing system performance, and ensuring security compliance. Candidates should have expertise in Windows platform engineering, AI/ML frameworks, scripting, and cloud services. This is a full-time position based in Calabasas, California.