T Mobile US
Sr. iOS Engineer
At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That's how we're UNSTOPPABLE for our employees! We are seeking a highly skilled and experienced Sr. iOS Engineer to help shape the future of the T-Mobile T-Life App. In this role, you'll collaborate with a talented team of mobile engineers to design, implement, and maintain high-quality iOS features that meet both business goals and user needs. You'll be responsible for delivering scalable, performant, and secure mobile solutions that drive an exceptional customer experience across T-Mobile's mobile ecosystem. The ideal candidate brings deep expertise in modern iOS development practicesincluding architecture design, testing strategies, and performance optimizationalong with strong collaboration and mentorship skills. You'll contribute to technical direction, ship features to production, guide best practices, and grow within a culture that values innovation, ownership, and continuous learning. *** This position will sit in Bellevue, WA; Overland Park, KS; Frisco, TX, or Herndon, VA. This is not a remote role - this is a hybrid environment requiring 3 days a week in office. Technical Execution
Design, build, and maintain iOS features using Swift and the latest frameworks and tools. Deliver high-performance, secure, and user-friendly features that meet platform and business requirements. Write unit and integration tests to ensure quality and reliability across the app. Debug and profile performance bottlenecks across devices and OS versions. Innovation & Product Impact
Collaborate with Product and Design teams to explore innovative features and user flows. Prototype and implement solutions that solve complex problems or introduce new capabilities. Contribute to feature planning and development cycles that align with strategic product objectives. Engineering Excellence & Leadership
Help define and enforce architectural patterns (MVVM, Coordinator, etc.) for codebase scalability. Guide junior developers through code reviews, pair programming, and design discussions. Promote clean code, modular design, and reusable components across the platform. Lead or participate in engineering workshops, tech talks, and continuous improvement initiatives. Tooling & Process
Work within an Agile environment using GitLab for CI/CD, source control, and merge request workflows. Collaborate cross-functionally with QA, backend teams, and platform engineers. Identify and address system-level risks or architectural gaps early in the dev lifecycle. Documentation & Communication
Create and maintain clear technical documentation for features, APIs, and workflows. Communicate engineering decisions and trade-offs with stakeholders and team leads. Education and Work Experience
Education
: Bachelor's Degree
in Computer Science, Engineering, or related field (required) Skills & Experience
: Core iOS Development
: 4-7 years' experience developing iOS apps using
Swift
(Objective-C and C++ a plus) Expertise with
Xcode ,
SwiftUI , UIKit, Interface Builder, and Apple SDKs Experience with
Core Data , RESTful APIs, and networking frameworks Strong grasp of
iOS memory management , concurrency (GCD), and threading Architecture & Patterns
: Working knowledge of architectural patterns like
MVVM ,
MVC , and
Coordinator Solid understanding of common iOS design patterns: Singleton, Delegate, Observer CI/CD & Version Control
: Proficient with
GitLab , Git workflows, and continuous integration practices Testing & Quality
: Experience building
maintainable, testable codebases Skilled in writing
unit tests
and performing
integration testing Product Mindset
: Familiarity with
Apple Human Interface Guidelines Ability to work closely with designers and product managers to ensure feature success Security
: Understanding of
iOS security best practices , including secure storage, communication (HTTPS), and OAuth Soft Skills
: Strong
problem-solving
and debugging skills Clear
communication
and ability to work collaboratively across teams A commitment to
continuous learning
and growth in mobile development Bonus Experience
: Familiarity with accessibility best practices (WCAG, VoiceOver testing) Experience integrating with backend services, feature flag systems, or A/B testing platforms Contributions to internal tooling, SDKs, or design systems Knowledge, Skills and Abilities
: Communication (Required) Customer Service (Required) Analytics (Required) Technical Writing (Required) We pride ourselves on encouraging a culture of innovation, advocating for agile methodologies, and promoting transparency in all that we do. Join us in embodying the spirit of the 'Un-carrier' and make a tangible impact! Our team is dynamic where no day is the same, and we are a diverse and inclusive team passionate about growth and innovation! If you're up to the challenge, apply today! At least 18 years of age Legally authorized to work in the United States Travel Required (Yes/No): Yes DOT Regulated Position (Yes/No): No Safety Sensitive Position (Yes/No): No Base Pay Range: $113,600 - $205,000 Corporate Bonus Target: 15% The pay range above is the general base pay range for a successful candidate in the role. The successful candidate's actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range. At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee's eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, visit At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical
At T-Mobile, we invest in YOU! Our Total Rewards Package ensures that employees get the same big love we give our customers. All team members receive a competitive base salary and compensation package - this is Total Rewards. Employees enjoy multiple wealth-building opportunities through our annual stock grant, employee stock purchase plan, 401(k), and access to free, year-round money coaches. That's how we're UNSTOPPABLE for our employees! We are seeking a highly skilled and experienced Sr. iOS Engineer to help shape the future of the T-Mobile T-Life App. In this role, you'll collaborate with a talented team of mobile engineers to design, implement, and maintain high-quality iOS features that meet both business goals and user needs. You'll be responsible for delivering scalable, performant, and secure mobile solutions that drive an exceptional customer experience across T-Mobile's mobile ecosystem. The ideal candidate brings deep expertise in modern iOS development practicesincluding architecture design, testing strategies, and performance optimizationalong with strong collaboration and mentorship skills. You'll contribute to technical direction, ship features to production, guide best practices, and grow within a culture that values innovation, ownership, and continuous learning. *** This position will sit in Bellevue, WA; Overland Park, KS; Frisco, TX, or Herndon, VA. This is not a remote role - this is a hybrid environment requiring 3 days a week in office. Technical Execution
Design, build, and maintain iOS features using Swift and the latest frameworks and tools. Deliver high-performance, secure, and user-friendly features that meet platform and business requirements. Write unit and integration tests to ensure quality and reliability across the app. Debug and profile performance bottlenecks across devices and OS versions. Innovation & Product Impact
Collaborate with Product and Design teams to explore innovative features and user flows. Prototype and implement solutions that solve complex problems or introduce new capabilities. Contribute to feature planning and development cycles that align with strategic product objectives. Engineering Excellence & Leadership
Help define and enforce architectural patterns (MVVM, Coordinator, etc.) for codebase scalability. Guide junior developers through code reviews, pair programming, and design discussions. Promote clean code, modular design, and reusable components across the platform. Lead or participate in engineering workshops, tech talks, and continuous improvement initiatives. Tooling & Process
Work within an Agile environment using GitLab for CI/CD, source control, and merge request workflows. Collaborate cross-functionally with QA, backend teams, and platform engineers. Identify and address system-level risks or architectural gaps early in the dev lifecycle. Documentation & Communication
Create and maintain clear technical documentation for features, APIs, and workflows. Communicate engineering decisions and trade-offs with stakeholders and team leads. Education and Work Experience
Education
: Bachelor's Degree
in Computer Science, Engineering, or related field (required) Skills & Experience
: Core iOS Development
: 4-7 years' experience developing iOS apps using
Swift
(Objective-C and C++ a plus) Expertise with
Xcode ,
SwiftUI , UIKit, Interface Builder, and Apple SDKs Experience with
Core Data , RESTful APIs, and networking frameworks Strong grasp of
iOS memory management , concurrency (GCD), and threading Architecture & Patterns
: Working knowledge of architectural patterns like
MVVM ,
MVC , and
Coordinator Solid understanding of common iOS design patterns: Singleton, Delegate, Observer CI/CD & Version Control
: Proficient with
GitLab , Git workflows, and continuous integration practices Testing & Quality
: Experience building
maintainable, testable codebases Skilled in writing
unit tests
and performing
integration testing Product Mindset
: Familiarity with
Apple Human Interface Guidelines Ability to work closely with designers and product managers to ensure feature success Security
: Understanding of
iOS security best practices , including secure storage, communication (HTTPS), and OAuth Soft Skills
: Strong
problem-solving
and debugging skills Clear
communication
and ability to work collaboratively across teams A commitment to
continuous learning
and growth in mobile development Bonus Experience
: Familiarity with accessibility best practices (WCAG, VoiceOver testing) Experience integrating with backend services, feature flag systems, or A/B testing platforms Contributions to internal tooling, SDKs, or design systems Knowledge, Skills and Abilities
: Communication (Required) Customer Service (Required) Analytics (Required) Technical Writing (Required) We pride ourselves on encouraging a culture of innovation, advocating for agile methodologies, and promoting transparency in all that we do. Join us in embodying the spirit of the 'Un-carrier' and make a tangible impact! Our team is dynamic where no day is the same, and we are a diverse and inclusive team passionate about growth and innovation! If you're up to the challenge, apply today! At least 18 years of age Legally authorized to work in the United States Travel Required (Yes/No): Yes DOT Regulated Position (Yes/No): No Safety Sensitive Position (Yes/No): No Base Pay Range: $113,600 - $205,000 Corporate Bonus Target: 15% The pay range above is the general base pay range for a successful candidate in the role. The successful candidate's actual pay will be based on various factors, such as work location, qualifications, and experience, so the actual starting pay will vary within this range. At T-Mobile, employees in regular, non-temporary roles are eligible for an annual bonus or periodic sales incentive or bonus, based on their role. Most Corporate employees are eligible for a year-end bonus based on company and/or individual performance and which is set at a percentage of the employee's eligible earnings in the prior year. Certain positions in Customer Care are eligible for monthly bonuses based on individual and/or team performance. To find the pay range for this role based on hiring location, visit At T-Mobile, our benefits exemplify the spirit of One Team, Together! A big part of how we care for one another is working to ensure our benefits evolve to meet the needs of our team members. Full and part-time employees have access to the same benefits when eligible. We cover all of the bases, offering medical