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 Principal Engineer, Software role is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. It involves collaborating with engineers to develop software components using technologies such as virtualization, microservices, software-defined networking, network functions virtualization, and big data platforms. The role requires applying judgment to resolve complex technical issues and making recommendations for software architecture and design. Success is measured by the effectiveness of software solutions, technical leadership contributions, and the ability to influence technology decisions. The work impacts the organization by enabling advanced software capabilities that improve operational efficiency and customer experience.

Job Responsibilities:

• Define and evolve the iOS engineering vision, setting architectural standards and long-term direction; lead high-complexity design to raise the bar for quality and scalability.

• Serve as a cross-functional leader across product, design, backend, QA, AI, and executives; align priorities, resolve dependencies, and mentor engineers to elevate technical capability.

• Drive mobile technology strategy by identifying platform and industry inflection points; translate into roadmap investments and lead adoption of AI-powered capabilities (on-device ML, personalization, conversational UX).

• Evaluate and apply technology strategies that align with business goals, driving scalable, high-impact system design improvements.

• Champion technical clarity through org-wide documentation standards (ADRs, runbooks, API governance, design templates) to scale knowledge and accelerate onboarding.

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

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)

• Experience developing iOS applications using Swift, Objective-C, SwiftUI, and the iOS SDK

Knowledge, Skills and Abilities:

• Communication (Required)

• Customer Service (Required)

• Analytics (Required)

• Technical Writing (Required)

Preferred Skills:

• Experience leading and scaling mobile retail apps in production, with a focus on reliability and performance.

• Deep knowledge of iOS architecture (MVC, MVVM, Coordinator, VIPER) and ability to influence standards across teams.

• Experience designing integrations (APIs, Core Data, SDKs) and contributing to CI/CD practices (GitLab or similar).

• Familiarity with observability tools (Firebase or similar) to support performance and system health.

• Exposure to AI-powered solutions (LLMs, personalization) and mobile security best practices (OAuth, encryption).

Licenses and Certifications:

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

Travel:
Travel Required (Yes/No): Yes, may require up to 10% travel based on business needs.

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

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, https://paylookup.t-mobile.com/paylookup?reqID=REQ350473¶dox=1

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.

Never stop growing!
As part of the T-Mobile team, you know the Un-carrier doesn’t have a corporate ladder–it’s more like a jungle gym of possibilities! We love helping our employees grow in their careers, because it’s that shared drive to aim high that drives our business and our culture forward. By applying for this career opportunity, you’re living our values while investing in your career growth–and we applaud it. You’re unstoppable!

T-Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship will be made without regard to age, race, ethnicity, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, religious affiliation, marital status, citizenship status, veteran status, the presence of any physical or mental disability, or any other status or characteristic protected by federal, state, or local law. Discrimination, retaliation or harassment based upon any of these factors is wholly inconsistent with how we do business and will not be tolerated.

Talent comes in all forms at the Un-carrier. If you are an individual with a disability and need reasonable accommodation at any point in the application or interview process, please let us know by emailing Applicant Accommodation@t-mobile.com or calling 1-844-873-9500. Please note, this contact channel is not a means to apply for or inquire about a position and we are unable to respond to non-accommodation related requests.