As a Sr. Principal Engineer, you will lead the design, stabilization, and delivery of scalable, secure, and high-performance enterprise solutions across the full stack using C#, .NET, SQL Server, Angular, and Azure Cloud. You will provide technical leadership in architecture, development, and deployment while mentoring engineering teams and collaborating closely with Product, Infrastructure, and business stakeholders. Experience or knowledge of IT Asset Disposition (ITAD) and reverse logistics processes is highly desirable.