Principal Software Engineer

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!

Job Overview This role sets technical direction for the systems that make T-Mobile's data usable across customer-facing applications, analytics, and AI-driven products. It involves designing and building high-performance services and APIs: the distributed data stores, low-latency access layers, and real-time sync mechanisms that deliver the right data to each consumer within strict latency and reliability targets. The role requires applying seasoned engineering judgment to solve complex systems challenges and to make recommendations on architecture, technology selection, and API and service design.

Success is measured by the scalability and reliability of these systems, the strength of technical leadership provided to engineers, and the ability to influence engineering decisions across the organization. The work impacts the organization by enabling the real-time, AI-ready capabilities that power better products and customer experiences.

Job Responsibilities:

Design and build serving infrastructure for AI use cases including vector databases, graph databases, and agent-facing data patterns

Design Infrastructure-as-Code blueprints for provisioning serving stores, sync pipelines, and APIs in a repeatable, governed way Partner with business teams and other technical teams to drive technical decision making, mentor engineers, and contribute to reusable blueprints and reference implementations.

Design and develop high-performance data stores, real-time sync pipelines, and governed APIs that deliver data at the latency and scale each use case requires

Drive engineering projects to deliver software solutions that meet technical requirements and quality standards

Provide technical leadership by mentoring engineers and influencing technology and policy decisions across the organization

Evaluate and apply technology strategies that align with business goals and system requirements

Develop innovative software designs and improvements that enhance existing systems and processes

Produce clear technical documentation and architecture descriptions for internal and external stakeholders

Also responsible for other duties/projects as assigned by business management as needed

Required Education and

Work Experience:

Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience (Required)
Acceptable areas of study include Computer Science or Engineering (Required)7-10 years Technical engineering experience. (Required)
Required

Knowledge, Skills and Abilities:

AI/ML Infrastructure Knowledge Graphs Vector Databases Streaming and caching architecture API Design and GovernanceMCP-Style tooling or agent facing data access patterns

Data sync pipelines

Analytics, Collaboration and Communication skills

Analytical Thinking, Cloud computing, Customer Service and Leadership skills

Software Development and Technical Writing skills

At least 18 years of age Legally authorized to work in the United States Travel:

Travel Required (Yes/No):
Yes

DOT Regulated:

DOT Regulated Position (Yes/No):
No

Safety Sensitive Position (Yes/No):
No

Compensation Range:

Bellevue, WA: $173,500 to $234,700

Atlanta, GA: $151,200 to $204,600

Total Target Cash Earnings Opportunity: $160,200 - $288,840

National Base Pay Range: $133,500 - $240,700

The Total Target Cash Earnings Opportunity…