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T-Mobile Logo T-Mobile · IT - Software Development

Sr Software Engineer- iOS

United States, Bellevue 113600.00 - 205000.00 USD / Year · Job Posted March 13, 2026
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Job Description

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.

Job Responsibility

  • 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

Requirements

  • Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience
  • Acceptable areas of study include Computer Science, Software Engineering, Information Management or equivalent experience in field
  • 4-7+ years - Technical engineering experience
  • Strong experience developing iOS applications using Swift and modern Apple frameworks such as SwiftUI and UIKit
  • Communication
  • Customer Service
  • Analytics
  • Technical Writing
  • At least 18 years of age
  • Legally authorized to work in the United States

Nice to have

  • 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

What we offer

  • Annual bonus or periodic sales incentive or bonus
  • Medical, dental and vision insurance
  • Flexible spending account
  • 401(k)
  • Employee stock grants
  • Employee stock purchase plan
  • Paid time off and up to 12 paid holidays
  • 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
  • Voluntary long-term care insurance
  • Mobile service & home internet discounts
  • Pet insurance
  • Access to commuter and transit programs
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