Sr Software Engineer- iOS

T-Mobile USA, Inc

Bellevue, WA

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JOB DETAILS

JOB TYPE

Full-time, Employee

SKILLS

Android, Apple, Apple Xcode, Application Programming Interface (API), Applications Security, Architectural Services, Artificial Intelligence (AI), Automation, Best Practices, Coaching, Computer Science, Concurrency, Continuous Deployment/Delivery, Continuous Integration, Cryptography, Customer Experience, Customer Support/Service, Documentation, Engineering, Git, High Availability, Memory Management, Mentoring, Mobile Applications, Mobile Applications Development, Mobile Technology, Model View Controller, Model View ViewModel (MVVM), OAuth, Operational Improvement, Operational Strategy, Organizational Skills, Performance Tuning/Optimization, Problem Solving Skills, Process Improvement, REST (Representational State Transfer), Regulatory Compliance, Requirements Management, Scalable System Development, Software Design, Software Development, Software Engineering, Stock Purchase Plans, Strategic Analysis, Swift, System Integration (SI), System Operations, Technical Delivery, Technical Strategy, Technical Support, Technical Writing, Testing, Unit Test, Willing to Travel, iOS

LOCATION

Bellevue, WA

POSTED

30+ days ago

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!

Are you ready to join the Un-carrier movement?

We are seeking a highly skilled and motivated Sr iOS Software Engineer to join the team powering the T-Life app-T-Mobile's flagship mobile experience. In this role, you will contribute to the design, development, and delivery of high-quality, performant, and AI-enabled Android features that reach millions of users.

The Sr Software Engineer is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. The role involves collaborating with engineers to develop software components using modern technologies and architectural best practices. It requires independent judgment to resolve technical issues and make recommendations for software design and implementation. Success is measured by the ability to deliver effective software solutions that integrate with system protocols and meet business and technical requirements. The work impacts organizational capabilities by enabling advanced software systems that improve operational efficiency and customer experience.

Develop software solutions and conduct tests to drive engineering projects and ensure quality deliverables, including design and development of scalable iOS features using Swift and modern Apple frameworks.

Contribute to design innovations that improve systems, processes, or services using new frameworks, architectural patterns such as MVVM or Coordinator, and industry best practices.

Collaborate with technical teams to deliver solutions and mentor others through knowledge sharing and training sessions, including guidance on mobile engineering standards and AI-enabled feature integration.

Support technology strategy by evaluating and applying current iOS technologies and mobile development trends that align with business goals.

Create clear documentation for software code, system designs, and business requirements to support knowledge sharing and cross-team collaboration.

Lead medium-to-large iOS initiatives, contribute to architectural decisions, and promote scalable, secure, and maintainable mobile application design.

Integrate RESTful APIs and backend services, including AI-powered services that enable personalization, conversational experiences, recommendations, and intelligent automation.

Ensure quality through strong unit testing, performance optimization, CI/CD participation, and adherence to security and app store compliance standards.

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

Education and Work Experience:

Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience (Required)

Acceptable areas of study include Computer Science, Software Engineering, Information Management or equivalent experience in field (Required)

4-7+ years - Technical engineering experience.

Strong experience developing iOS applications using Swift and modern Apple frameworks such as SwiftUI and UIKit.

Knowledge, Skills and Abilities:

Communication (Required)

Customer Service (Required)

Analytics (Required)

Technical Writing (Required)

Preferred Qualifications:

Experience with architectural patterns such as MVVM, MVC, or Coordinator.

Experience integrating RESTful APIs and backend services that support personalization or intelligent user journeys.

Exposure to AI-powered APIs, LLM-backed services, inference endpoints, or recommendation systems.

Understanding of AI/ML concepts including model limitations, inference workflows, data privacy considerations, and responsible AI practices.

Experience with Xcode, CI/CD pipelines, Git workflows, and mobile release processes.

Strong understanding of iOS memory management, concurrency, threading, and performance profiling.

Experience mentoring engineers and contributing to shared platform components or design systems.

Experience building and releasing consumer-facing mobile applications at scale.

Understanding of secure mobile development practices including encryption, OAuth flows, and secure API communication.

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

Base Pay Range: $113,600 - $205,000

Corporate Bonus Target: 15%

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.

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 ApplicantAccommodation@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.

EOE Statement

We Take Equal Opportunity Seriously - By Choice

T-Mobile USA, Inc. is an Equal Opportunity Employer. All decisions concerning the employment relationship will be made without regard to age, race, color, religion, creed, sex, sexual orientation, gender identity or expression, national origin, marital 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 or harassment based upon any of these factors is wholly inconsistent with our Company values and will not be tolerated. Furthermore, such discrimination or harassment may violate federal, state, or local law.

About the Company

T-Mobile USA, Inc

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