Sr Vendor Manager - Roaming and Wholesale

At T-Mobile, we invest in YOU!  Our Total Rewards Package ensures that employees get the same big love we give our customers.  All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That’s how we’re UNSTOPPABLE for our employees!

The Roaming and Wholesale organization at T-Mobile is at the forefront of innovation, driving new solutions, emerging technologies, and strategic vendor partnerships to support evolving business and customer needs.
The Roaming & Wholesale Product management team is responsible for enabling seamless customer experiences and managing the lifecycle of products and solutions delivered internally or through strategic vendor partnerships.

The Senior Vendor Manager for Roaming and Wholesale Products & Solutions is responsible for managing key vendor relationships that support roaming capabilities and back-office functions for commercial, finance, analytics, and accounting teams involved in roaming partnerships. This role ensures that vendor-delivered products and services align with business objectives, contractual commitments, technology evolution, and applicable GSMA standards.
This position serves as the central liaison between internal stakeholders and external vendors to ensure clear requirements, effective delivery, strong operational performance, and ongoing service improvement. The Vendor Manager drives accountability for implementation, service quality, issue resolution, and adherence to contractual obligations while supporting business and operational goals.

Job Responsibilities:

• Manage strategic vendor relationships supporting roaming and wholesale products and solutions.

• Act as the primary point of contact for vendor performance, quarterly business reviews, escalations, issue resolution, and service improvement initiatives.

• Build and maintain strong relationships with vendors to align expectations, improve delivery reliability, and support long-term business goals.

• Ensure vendor contracts remain aligned with technology evolution, business priorities, and the latest GSMA and wireless industry standards.

• Drive accountability across both T-Mobile and vendor teams for implementation, service levels, deliverables, and compliance with contractual terms.

• Partner with internal stakeholders across Commercial, Analytics, Network, Finance, Accounting, Operations, Engineering, and IT to gather, clarify, and prioritize business needs.

• Translate business needs into clear requirements and work with vendors or internal delivery teams to ensure solutions are developed, tested, and delivered accurately and on time.

• Resolve conflicting requirements, manage tradeoff decisions, and ensure alignment between business priorities and vendor capabilities.

• Oversee end-to-end lifecycle management for vendor-supported roaming and wholesale products and operational solutions, from intake through delivery and ongoing support.

• Produce and maintain clear business documentation, including BRDs, operational requirements, user stories, acceptance criteria, and vendor deliverables where applicable.

• Maintain a current understanding of GSMA standards and wireless industry trends in Retail and IoT Roaming, and assess their impact on vendor strategy, contracts, and service roadmap.

• Collaborate with vendors and internal partners to assess emerging opportunities, risks, and required changes to product or service capabilities.

• Support P&L and budget goals by identifying opportunities for cost savings, service quality improvement, and operational efficiency.

• Partner with leadership to support back-office budget planning for projects, vendor investments, and service improvements.

• Ensure enterprise processes are followed to secure and maintain funding for vendor-supported initiatives and help remove blockers impacting delivery.

• Participate in Big Room / Program Increment planning and other major Agile planning sessions and governance forums as needed to align vendor delivery with business priorities.

• Coordinate communication and activities across internal teams and vendors to ensure consistent execution and transparency.

• Manage vendor resource performance and delivery accountability, where applicable.

• Work collaboratively with Product, RTEs, Scrum Masters, Engineering, IT, and Operations teams to support successful solution delivery and operational readiness.

• Take on other duties and special projects as assigned by business lead