Washington Staffing
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 practices-including architecture design, testing strategies, and performance optimization-along 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
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 cont
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 practices-including architecture design, testing strategies, and performance optimization-along 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
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 cont