Senior Software Engineer – iOS

T-Mobile

Sr Software Engineer developing high-quality iOS features for T-Mobile's flagship mobile app. Collaborating with teams to ensure software excellence with scalable and secure designs.

Posted 5/14/2026full-timeBellevue • Kansas, Texas, Washington • 🇺🇸 United StatesSenior💰 $113,600 - $205,000 per yearWebsite

Tech Stack

Tools & technologies

iOSSwift

About the role

Key responsibilities & impact

Contribute to the design, development, and delivery of high-quality, performant, and AI-enabled features that reach millions of users.
Design, implement, and deploy scalable software solutions that meet customer requirements and support high availability environments.
Collaborate with engineers to develop software components using modern technologies and architectural best practices.
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.
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.

Requirements

What you’ll need

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 - Technical engineering experience.
Strong experience developing iOS applications using Swift and modern Apple frameworks such as SwiftUI and UIKit.
Communication (Required)
Customer Service (Required)
Analytics (Required)
Technical Writing (Required)

Benefits

Comp & perks

medical, dental and vision insurance
flexible spending account
401(k)
employee stock grants
employee stock purchase plan
paid time off
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

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

iOS developmentSwiftSwiftUIUIKitRESTful APIsunit testingperformance optimizationCI/CDarchitectural patternsAI-enabled features

Soft Skills

communicationcustomer serviceanalyticstechnical writingcollaborationmentoringknowledge sharingleadershipproblem solvinginnovation