Principal GenAI Software Engineer

Drive the architecture, design, and production deployment of enterprise-scale software development releases using generative AI systems, including LLM orchestration, Agent/Skill creation, retrieval-augmented generation, evaluation, and operational monitoring. Design and implement modular AI agents that connect to our core systems Create clean abstractions that let non-technical users to leverage these agents into useful workflows without writing code. Provide technical leadership by mentoring engineers and influencing technology and policy decisions across the organization Establish GenAI engineering standards, reference architectures, and guardrails to ensure scalability, security, cost efficiency, and responsible AI use across multiple teams. Create templates, patterns, and documentation that accelerate everyone's ability to deliver. Develop innovative generative-AI enabled 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

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)

Preferred Qualifications:

Proven track record of architecting and scaling enterprise-grade GenAI platforms (LLM orchestration, agent frameworks) that serve multiple teams and operate reliably in production. Experience establishing AI engineering standards, reference architectures, and governance models adopted across an organization. Demonstrated ability to design composable AI systems and internal developer platforms that enable non-technical users to build workflows without engineering support. Recognized technical leader with experience influencing cross-functional strategy, mentoring senior engineers, and driving AI adoption at the organizational level. Experience with release management & CI/CD deployment best practices

Knowledge, Skills and Abilities:

Communication (Required) Customer Service (Required) Analytics (Required) Technical Writing (Required)

Licenses and Certifications:

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

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!, DOT Regulated: DOT Regulated Position (Yes/No): No Safety Sensitive Position (Yes/No): No

Compensation Range for Bellevue, WA: $173,500 to $234,700

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

Corporate Bonus Target: 20%

The pay range above is the general base pay range for a successful candidate in the role. The successful candidate's actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range.

At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee's eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, click here.

At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - 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, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile's amazing benefits, check out www.t-mobilebenefits.com