Sr Software Engineer, ioS

Base Pay Range: $113,600 - $205,000. Corporate Bonus Target: 15%. Benefits include life insurance, vision insurance, flexible benefit account, paid time off, paid holidays, tuition assistance, 401(k), medical, dental, vision, flexible spending account, employee stock grants, employee stock purchase plan, paid parental and family leave, family building benefits, backup care, childcare subsidy, voluntary AD&D, voluntary accident, voluntary life, voluntary disability, voluntary long‑term care, mobile service & home internet discounts, pet insurance, commuter and transit programs, and access to free year‑round money coaches. We are seeking a highly skilled and motivated Senior 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 features that reach millions of users. The Senior 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. 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 the field (Required) 4‑7+ years of technical engineering experience Strong experience developing iOS applications using Swift and modern Apple frameworks such as SwiftUI and UIKit (Required) 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. Additional Requirements At least 18 years of age Legally authorized to work in the United States Travel Travel Required: Yes. DOT Regulated Position Regulated: No. Safety Sensitive Position: No. 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 View email address on click.appcast.io or calling View phone number on click.appcast.io. 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. #J-18808-Ljbffr T-MOBILE USA, Inc.