Principal Software Engineer iOS - National Retail

T-Mobile•Frisco, WA

About The Position

This 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. The work impacts the organization by enabling advanced software capabilities that improve operational efficiency and customer experience.

Requirements

Bachelor's Degree plus 7 years of related work experience OR Advanced degree with 5 years of related experience
Acceptable areas of study include Computer Science or Engineering
7-10 years Technical engineering experience
Experience developing iOS applications using Swift, Objective-C, SwiftUI, and the iOS SDK
Communication
Customer Service
Analytics
Technical Writing
At least 18 years of age
Legally authorized to work in the United States

Nice To Haves

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).

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.