Principal Vendor Manager

The Principal Vendor Manager plays a key role in maximizing the performance, value, and resilience of T-Mobile’s strategic technology partners. As a senior individual contributor within the Vendor Management function, this role executes governance frameworks that ensure vendors deliver consistently against contractual commitments, service level agreements (SLAs), and compliance requirements while driving operational excellence and innovation. The Principal Vendor Manager is responsible for monitoring and analyzing vendor performance, financial health, security posture, and regulatory compliance to proactively identify risks and ensure operational continuity. Through strong partnership with internal stakeholders—including Procurement, IT, Finance, Legal, and business teams—this role ensures vendor relationships contribute measurable results to T-Mobile’s digital transformation and customer experience goals. By applying market insights, benchmarking, and continuous improvement practices, the Principal Vendor Manager drives value realization and ensures vendor services remain competitive and future ready. Acting as a subject matter expert and peer leader, this role promotes consistency in vendor management best practices and contributes to a culture of accountability, collaboration, and innovation across the organization.