Senior Software Engineer, iOS

Team

Join T-Mobile's team powering the T-Life app — the flagship mobile experience reaching millions of users. You'll contribute to the design, development, and delivery of high-quality, performant, and AI-enabled iOS features, collaborating with cross-functional engineering teams.

Responsibilities

• Develop software solutions and conduct tests to drive engineering projects, 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 (MVVM or Coordinator), and industry best practices
• Collaborate with technical teams to deliver solutions and mentor others through knowledge sharing and training sessions
• Support technology strategy by evaluating and applying current iOS technologies and mobile development trends
• Create clear documentation for software code, system designs, and business requirements
• 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 enabling 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

Requirements

• Bachelor's Degree plus 5 years of related work experience; OR advanced degree with 3 years of related experience
• 4-7 years of technical engineering experience
• 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 (LLM-backed APIs, personalization or recommendation systems)

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 (GitHub Copilot, ChatGPT Enterprise, Claude) to accelerate coding, documentation, and code review workflows
• Knowledge of iOS accessibility standards and implementation (VoiceOver, Dynamic Type)
• Experience with CI/CD tools for iOS (Fastlane, Xcode Cloud, TestFlight)
• Familiarity with performance profiling tools (Instruments, MetricKit)
• Experience working in Agile/Scrum development environments

Benefits

• 15% corporate bonus target
• Annual stock grant
• Employee stock purchase plan
• 401(k)
• Medical, dental, vision insurance
• Flexible spending account
• Paid time off (approximately 4 weeks for new full-time employees)
• Up to 12 paid holidays
• Paid parental and family leave
• Family building benefits
• Back-up care and enhanced family support
• Childcare subsidy
• Tuition assistance
• College coaching
• Short- and long-term disability
• Voluntary AD&D coverage, accident, life, disability insurance
• Mobile service & home internet discounts
• Pet insurance
• Commuter and transit programs
• Free year-round money coaches
• Opportunity to work on T-Life flagship app
• AI-enabled development culture
• Equal opportunity employer with accommodations available
• Travel may be required up to 10%