Principal Vendor Manager

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This position is required to work onsite at the Frisco, TX or Overland Park, KS office at least 3 days a week. It is not available for remote opportunity.

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.

• Manages and enhances large‑scale partnerships with key suppliers to enforce contract terms and drive supplier performance.
• Enforces robust contract terms with suppliers to ensure compliance and performance standards are met.
• Contributes to strategic objectives and planning through expertise in vendor relations, operations, and supply chain management.
• Facilitates effective communication channels between internal teams and suppliers to proactively share information and resolve operational issues.
• Implements new technologies to drive continuous process improvements across multiple large‑scale partnerships.
• Provides guidance and leadership on vendor management best practices to ensure consistent excellence across the organization. Collaborates with procurement, operations, and project management teams to align vendor management strategies with business needs.
• Also responsible for other Duties/Projects as assigned by business management as needed.

• Bachelor's Degree Business Administration, Supply Chain Management, or related field (Required)
• Master's/Advanced Degree Business Administration, Supply Chain Management, or related field (Preferred)
• 7‑10 years – Managing and optimizing large‑scale partnerships with key suppliers in telecommunications or related industry required.
• 7‑10 years – Implementing new technologies and systems for supplier performance and process improvement required.
• 7‑10 years – Leading cross‑functional teams to resolve operational and functional escalations in vendor management required.

• Vendor Management– Expertise in managing and optimizing relationships with key suppliers to enforce contract terms and improve supplier performance. (Required)
• Strategic Thinking– Ability to develop strategies that align with the company’s objectives and enhance vendor relations. (Required)
• Negotiation– Strong negotiation skills to secure favorable terms and manage costs effectively in supplier contracts. (Required)
• Project Management– Proficiency in managing large‑scale projects, including the implementation of new technologies and process improvements. (Required)
• Telecommunications– In‑depth knowledge of…