Principal Sales Engineer — Solutions & Partner Enablement (Network APIs)

T-Mobile • Bellevue, WA

76d • $133,800 - $241,400

About The Position

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! Location: Bellevue, WA (Hybrid) — Onsite at least 3 days/week. This role is not remote. The Team & Mission T Mobile’s Network as a Service (NaaS) team builds innovative network API products that empower developers, partners, and enterprises to build their differentiated digital solutions. Our mission is to solve enterprise challenges with scalable, developer friendly solutions that tap into T Mobile’s differentiated network capabilities.

Requirements

• Deep expertise in APIs, SDKs, and developer platforms, with strong engineering fundamentals and integration skills.
• Sharp business context understanding to assess customer needs and align technical solutions with business goals.
• Strong product sense to translate complex capabilities into clear customer value.
• Hands-on experience leading presales and post sales technical engagements for enterprise customers.
• Proven ability to manage complex projects and drive execution across product, engineering, and GTM teams.
• Excellent communicator who can bridge technical depth with business clarity and executive impact.
• Adaptive, agile, and growth-oriented mindset—comfortable operating in ambiguity, shifting priorities, and driving continuous learning and improvement.

Nice To Haves

• Exposure to AI- or automation-driven developer tools and modern API lifecycle management.

Responsibilities

• Act as the bridge between Product and Business Development, ensuring customer needs align with product capabilities.
• Support presales conversations by understanding customer requirements and showing how our products deliver value.
• Educate customers on how to use our products effectively through demos, technical discussions, and proof-of-concepts.
• Serve as the main technical and product point of contact after the deal is signed, driving smooth onboarding and integration.
• Partner with product managers to create key materials such as presales decks, solution architectures, and technical documentation to support customer and partner engagement.
• Gather customer feedback to influence product roadmap and improve the overall experience.

Benefits

• Medical, dental and vision insurance
• Flexible spending account
• 401(k)
• Employee stock grants
• Employee stock purchase plan
• Paid time off and up to 12 paid holidays
• Paid parental and family leave
• Family building benefits
• Back-up care
• Enhanced family support
• Childcare subsidy
• Tuition assistance
• College coaching
• Short- and long-term disability
• Voluntary AD&D coverage
• Voluntary accident coverage
• Voluntary life insurance
• Voluntary disability insurance
• Voluntary long-term care insurance
• Mobile service & home internet discounts
• Pet insurance
• Access to commuter and transit programs

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Bachelor's degree
• Number of Employees: 11-50 employees