Principal Software Engineer iOS - National Retail
T-Mobile, Factoria, WA, United States
Job Overview
Principal Engineer, Software role is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. It involves collaborating with engineers to develop software components using technologies such as virtualization, microservices, software‑defined networking, network functions virtualization, and big data platforms. The role requires applying judgment to resolve complex technical issues and making recommendations for software architecture and design. Success is measured by the effectiveness of software solutions, technical leadership contributions, and the ability to influence technology decisions.
Job Responsibilities
Define and evolve the iOS engineering vision, setting architectural standards and long‑term direction; lead high‑complexity design to raise the bar for quality and scalability.
Serve as a cross‑functional leader across product, design, backend, QA, AI, and executives; align priorities, resolve dependencies, and mentor engineers to elevate technical capability.
Drive mobile technology strategy by identifying platform and industry inflection points; translate into roadmap investments and lead adoption of AI‑powered capabilities (on‑device ML, personalization, conversational UX).
Evaluate and apply technology strategies that align with business goals, driving scalable, high‑impact system design improvements.
Champion technical clarity through org‑wide documentation standards (ADRs, runbooks, API governance, design templates) to scale knowledge and accelerate onboarding.
Also responsible for other duties/projects as assigned by business management as needed.
Education and Work Experience
Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience (Required)
Acceptable areas of study include Computer Science or Engineering (Required)
7–10 years Technical engineering experience (Required)
Experience developing iOS applications using Swift, Objective‑C, SwiftUI, and the iOS SDK
Knowledge, Skills, and Abilities
Communication (Required)
Customer Service (Required)
Analytics (Required)
Technical Writing (Required)
Preferred Skills
Experience leading and scaling mobile retail apps in production, with a focus on reliability and performance.
Deep knowledge of iOS architecture (MVC, MVVM, Coordinator, VIPER) and ability to influence standards across teams.
Experience designing integrations (APIs, Core Data, SDKs) and contributing to CI/CD practices (GitLab or similar).
Familiarity with observability tools (Firebase or similar) to support performance and system health.
Exposure to AI‑powered solutions (LLMs, personalization) and mobile security best practices (OAuth, encryption).
Licenses and Certifications
At least 18 years of age
Legally authorized to work in the United States
Travel
Travel required: Yes, may require up to 10% travel based on business needs.
Base Pay Range
$133,500 – $240,700. Corporate bonus target: 20%.
Benefits
Medical, dental, and vision insurance; flexible spending account; 401(k); employee stock grants and purchase plan; paid time off and holidays; parental leave; tuition assistance; disability and life insurance options; mobility and commuter benefits.
Equal Opportunity Employer
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, 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. 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 ApplicantAccommodation@t-mobile.com or calling 1‑844‑873‑9500.
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Principal Engineer, Software role is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. It involves collaborating with engineers to develop software components using technologies such as virtualization, microservices, software‑defined networking, network functions virtualization, and big data platforms. The role requires applying judgment to resolve complex technical issues and making recommendations for software architecture and design. Success is measured by the effectiveness of software solutions, technical leadership contributions, and the ability to influence technology decisions.
Job Responsibilities
Define and evolve the iOS engineering vision, setting architectural standards and long‑term direction; lead high‑complexity design to raise the bar for quality and scalability.
Serve as a cross‑functional leader across product, design, backend, QA, AI, and executives; align priorities, resolve dependencies, and mentor engineers to elevate technical capability.
Drive mobile technology strategy by identifying platform and industry inflection points; translate into roadmap investments and lead adoption of AI‑powered capabilities (on‑device ML, personalization, conversational UX).
Evaluate and apply technology strategies that align with business goals, driving scalable, high‑impact system design improvements.
Champion technical clarity through org‑wide documentation standards (ADRs, runbooks, API governance, design templates) to scale knowledge and accelerate onboarding.
Also responsible for other duties/projects as assigned by business management as needed.
Education and Work Experience
Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience (Required)
Acceptable areas of study include Computer Science or Engineering (Required)
7–10 years Technical engineering experience (Required)
Experience developing iOS applications using Swift, Objective‑C, SwiftUI, and the iOS SDK
Knowledge, Skills, and Abilities
Communication (Required)
Customer Service (Required)
Analytics (Required)
Technical Writing (Required)
Preferred Skills
Experience leading and scaling mobile retail apps in production, with a focus on reliability and performance.
Deep knowledge of iOS architecture (MVC, MVVM, Coordinator, VIPER) and ability to influence standards across teams.
Experience designing integrations (APIs, Core Data, SDKs) and contributing to CI/CD practices (GitLab or similar).
Familiarity with observability tools (Firebase or similar) to support performance and system health.
Exposure to AI‑powered solutions (LLMs, personalization) and mobile security best practices (OAuth, encryption).
Licenses and Certifications
At least 18 years of age
Legally authorized to work in the United States
Travel
Travel required: Yes, may require up to 10% travel based on business needs.
Base Pay Range
$133,500 – $240,700. Corporate bonus target: 20%.
Benefits
Medical, dental, and vision insurance; flexible spending account; 401(k); employee stock grants and purchase plan; paid time off and holidays; parental leave; tuition assistance; disability and life insurance options; mobility and commuter benefits.
Equal Opportunity Employer
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, 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. 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 ApplicantAccommodation@t-mobile.com or calling 1‑844‑873‑9500.
#J-18808-Ljbffr