Sr Software Engineer, iOS

Senior iOS 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

We are seeking a highly skilled and motivated iOS Sr. 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 iOS features that reach millions of users.

The Sr. Software Engineer is essential for designing, implementing, and deploying scalable mobile software solutions that meet customer requirements and support high-availability environments. This role focuses on iOS application development within established architecture, collaborating with cross-functional engineering teams to build modern, reliable features and integrate backend services—including AI-powered capabilities. Success is measured by the ability to deliver dependable technical solutions, produce clear documentation, and contribute to continuous improvement and innovation that enhances customer experience and supports business goals.

Job Responsibilities

• 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.
• Mentor and coach junior engineers while providing technical leadership across cross-functional teams, promoting knowledge sharing, engineering best practices, operational excellence, and a culture of accountability and continuous improvement.
• Drive execution of daily operational activities, incident remediation, and service improvement initiatives, ensuring projects and operational commitments are successfully delivered through implementation, stabilization, and ongoing support.
• 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 of technical engineering experience. (Required)

Knowledge, Skills, and Abilities

• Proficiency in Swift and familiarity with Objective-C for legacy code maintenance.
• Experience with UIKit and/or SwiftUI for building production-grade iOS interfaces.
• Strong understanding of iOS app lifecycle, memory management (ARC), and performance optimization.
• Experience integrating RESTful APIs using async networking patterns (URLSession, Combine, async/await).
• Familiarity with dependency management tools (Swift Package Manager, CocoaPods).
• Experience working with Git-based workflows and collaborative code review processes.
• Foundational exposure to AI-enabled backend services (e.g., LLM-backed APIs, personalization or recommendation systems).
• Communication (Required)
• Customer Service (Required)
• Analytics (Required)
• Technical Writing (Required)

Preferred Qualifications

• Experience with SwiftUI for building modern, declarative iOS interfaces.
• Proficiency with Swift Concurrency (async/await) and/or Combine for reactive and asynchronous programming.
• 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.
• Familiarity with AI-assisted development tools (e.g., GitHub Copilot, ChatGPT Enterprise, Claude) to accelerate coding, documentation, and code review workflows.
• Knowledge of iOS accessibility standards and implementation (e.g., VoiceOver, Dynamic Type).
• Experience with CI/CD tools for iOS (e.g., Fastlane, Xcode Cloud, TestFlight).
• Familiarity with performance profiling tools (e.g., Instruments, MetricKit).
• Experience working in Agile/Scrum development environments.
• 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

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, copy and paste this link into your browser: https://paylookup.t-mobile.com/paylookup?reqID=REQ356110

Benefits

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.

Growth Opportunities

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!

Equal Opportunity Employer Statement

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.

Reasonable Accommodation

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.

Key skills/competency

• Swift
• Objective-C
• UIKit
• SwiftUI
• iOS App Lifecycle
• Memory Management
• Performance Optimization
• RESTful APIs
• AI-enabled Backend Services
• Agile/Scrum