Sr Software Engineer- iOS

Job Overview

Sr iOS Software Engineer passionate about designing, building, and delivering high‑quality, performant, and AI‑enabled features for the T‑Life app, T‑Mobile’s flagship mobile 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.

• 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 Swift
  
  UI and UIKit.

• Communication (Required)
• Customer Service (Required)
• Analytics (Required)
• Technical Writing (Required)

• 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 Required:

Yes

DOT Regulated Position:
No

Safety Sensitive Position:
No

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

Corporate Bonus Target: 15%

We offer comprehensive benefits including 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, and voluntary long‑term care insurance.

Eligible employees may also receive mobile service and home internet discounts, pet insurance, and access to commuter and transit programs.

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