Principal Engineers, Software

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Position summary:

T-Mobile is America’s supercharged Un-carrier, delivering an advanced 4G LTE and transformative nationwide 5G network that will offer reliable connectivity for all. Principal Engineers, Software is located in Bellevue, WA will drive engineering projects and team members by developing software solutions; conducting tests and inspections; preparing reports and calculations.

Telecommuting is permitted, but applicant must work from the worksite location at least 3-4 days per week. No additional national or international travel is anticipated.

Position duties and responsibilities include, but are not limited to:

• •Expected to supervise base through senior level engineers as needed.
• •Presents project improvement scenarios to management for consideration.
• •Monitors and influence relevant industry technologies and standards.
• •Presents highly technical concepts to both technical and non-technical decision-makers.
• •Continuously learns, creates content, and teaches others specific subject areas.
• •Informally coaches and contributes to the development of others through mentoring or in house workshops and learning sessions.
• •Develops engineers across functional teams on technology decisions.
• •Influence technology and policy decisions made across the VP organization.
• •Understand financial decisions, including NPV and ROI, based on customer experience/business drivers.
• •Evaluates new and existing technology options that support business goals.
• •Understands current technology that supports business goals.
• •Understands system protocols, how systems operate and data flows.
• •Aware of current technology benefits.
• •Expected to independently develop a full software stack.
• •Understands the building blocks, interactions, dependencies, and tools required to complete software and automation work.
• •Independent study of current technology is expected.
• •Interact with system engineers to define system requirement and/or necessary requirements for automation.
• •Develops, designs, and implements new ideas which utilize new frameworks to improve an existing or new

system/process/service.

• •Investigative independent study and problem solving for non-routine tasks.
• •Analyzes existing processes and vendor roadmaps to highlight upcoming technology changes that would make the processes or tools more effective within a given VP function.
• •Contributes to the creation of company IPR.
• •Writes advanced documentation, architecture, capabilities, limitations, and advantages for technologies.
• •Creates and modifies clear documentation for new code and systems used.
• •Documenting systems designs, presentations, and business requirements for consumption and consideration at the director level.
• •Contributes to industry professional norms.
• •Contributes to the protection of company IPR.

Minimum requirements:

Experience and education requirements:

PRIMARY REQUIREMENTS: Bachelor’s degree or foreign equivalent in Computer Science, Computer Programming, Computer Engineering, or related, and 7 years of relevant work experience in any occupation in which the required experience is gained.

ALTERNATIVE REQUIREMENTS: Master’s degree or foreign equivalent in Computer Science, Computer Programming, Computer Engineering, or related, and five (5) years of relevant work experience in any occupation in which the required experience is gained.

Skills requirements: Requires experience in each of the following:

1. Designing and developing large-scale Android application using Kotlin, Jetpack Compose, and Android architecture components, ensuring compliance with Google Play publishing requirements.

2. Architecting modular, scalable, and testable Android solutions using Clean Architecture, MVVM, and established design patterns using Factory, Adapter, and Singleton to support longterm platform evolution and code maintainability.

3. Implementing asynchronous and reactive application flows using Kotlin Coroutines and Flow to manage UI state, background processing, and lifecycle-aware components for responsive and resilient Android applications.

4. Implementing continuous integration and deployment (CI/CD) pipelines using tools: GitLab, Fastlane, Docker, and SonarQube to automate build, test, and release processes and maintain high code quality across environments.

5. Optimizing app performance and reliability through benchmarking, profiling, and Android build tools: Gradle, Proguard; applying testing culture with frameworks Espresso to ensure quality, accessibility, and stability.

6. Providing technical leadership in Android application development by defining architectural standards, enforcing coding best practices using: SonarQube, Detekt, ktlint, and Android Lint; conducting design and code reviews using: GitLab and JIRA, and collaborating with cross-functional engineering, product, and UX teams to deliver scalable mobile solutions using: Jetpack Compose, Gradle, CI/CD pipelines (Jenkins), and Modular architecture patterns.

Additional:

• •Location: Bellevue , WA
• •Telecommuting is permitted, but applicant must work from the worksite location at least 3-4 days per week. No additional national or international travel is anticipated.
• •This position is eligible for the employee referral program.

How to apply :

• •Visit https://www.t-mobile.com/careers
• •Create a candidate profile, and apply to requisition number: REQ373671.

OTHER: Work hours: 40 hours/week. Salary: $206,086 - $211,086 per year.

• •The pay range above is the general base pay range for a successful candidate in the state listed. The successful candidate’s actual pay will be based on various factors, such as work location, qualifications, and experience.
• •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, while Retail and Business Sales roles are eligible for monthly or quarterly sales incentives. And since we are ALL owners, EVERY employee at T-Mobile is eligible for an Annual Stock Grant. For information about T-Mobile’s amazing benefits, check out

https://careers.t-mobile.com/culture-and-benefits .

• •At least 18 years of age
• •Legally authorized to work in the United States

• Travel :
• Travel Required (Yes/No): No

• DOT Regulated :
• DOT Regulated Position (Yes/No): No
• Safety Sensitive Position (Yes/No): No

Candidate’s pay will be based on various factors, such as work location, qualifications, and experience. 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.

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,