Sr Engineer, Software

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!

Job Overview:
We are looking for a highly skilled Senior Software Engineer to join the T-Life Backend Engineering team. This team builds and scales the core backend systems that power T-Mobile’s customer-facing mobile experiences, including the T-Life app. In this role, you will develop Java-based microservices and APIs that support millions of users—enabling scalable, secure, AI-enhanced, and high-performance experiences across T-Mobile’s digital ecosystem.
The ideal candidate brings strong Java expertise, deep knowledge of cloud-native engineering practices, and experience deploying resilient services in production. We are also seeking engineers who actively leverage AI-assisted development tools to accelerate delivery, improve code quality, and drive engineering efficiency.

Job Responsibilities:

Technical Engineering

• Lead the design and development of scalable Java microservices supporting mobile feature delivery at high scale.
• Build secure, reliable APIs consumed by iOS, Android, and web/internal systems.
• Write clean, maintainable code backed by comprehensive unit, integration, and contract tests.
• Ensure code meets high standards for performance, reliability, observability, and security.
• Collaborate with system engineers to align backend data flows, service contracts, and integration patterns.
• Provide mentorship and conduct regular code reviews to promote technical excellence.
• Use AI-based development tools (e.g., AI pair programming, automated refactoring, intelligent code generation) to speed up development cycles, enhance code quality, and reduce manual effort.

Innovation & Platform Maturity

• Drive platform-level improvements in event streaming, configuration management, and service health visibility.
• Explore and adopt emerging technologies, including AI-driven developer tooling, that reduce latency, simplify deployments, or enhance resilience.
• Identify opportunities for refactoring or architecture modernization aligned with API-first, mobile-first principles.
• Champion the use of AI for tasks such as documentation generation, test creation, triage automation, and code optimization.

Cross-Functional Collaboration

• Partner with mobile engineers to define backend contracts and troubleshoot client-service interactions.
• Work closely with Product, QA, and UX teams to ensure backend APIs meet functionality and experience requirements.
• Participate in PI planning, sprint ceremonies, and cross-functional release activities across the T-Life ecosystem.
• Collaborate with teams to identify high-impact use cases for AI that improve delivery velocity and operational efficiency.

Technical Documentation & Communication

• Create clear, comprehensive technical documentation for backend services, API contracts, and architectural patterns.
• Contribute to internal design documents, Confluence resources, and onboarding guides.
• Leverage AI tools to assist in generating and maintaining high-quality documentation.

Education and Work Experience:

• Bachelor’s degree in Computer Science, Engineering, or related technical field (or equivalent practical experience)

Knowledge, Skills and Abilities:

Required Skills & Experience

• 7+ years in backend or platform engineering, primarily using Java (8+)
• Proven experience building and scaling RESTful APIs
• Strong understanding of microservice architecture, event-driven systems, and distributed service orchestration
• Experience with cloud platforms (AWS, Azure, or equivalent)
• Hands-on experience with CI/CD pipelines, automated testing, and API monitoring
• Proficiency with NoSQL (MongoDB, Cassandra) and relational databases
• Strong knowledge of security best practices (OAuth, HTTPS, token lifecycle management)
• Ability to debug production issues, create monitoring/alerting, and own services end-to-end
• Demonstrated experience using AI-based engineering tools (e.g., GitHub Copilot, code assistants, automated testing frameworks, AI-driven debugging or triage) to enhance developer productivity

Preferred Skills

• Experience building APIs used by mobile clients
• Familiarity with Kafka or event-streaming platforms
• Knowledge of Docker, Kubernetes, and container orchestration
• Experience with geolocation, personalization, or session management systems
• Exposure to analytics tools, observability platforms (Splunk, Datadog), or APM technologies
• Experience developing or integrating AI/ML-powered features or developer workflows

Licenses and Certifications:

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

Travel:
Travel Required (Yes/No): Yes

DOT Regulated:
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, https://paylookup.t-mobile.com/paylookup?reqID=REQ340458&paradox=1

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, dental and vision insurance, a flexible spending account, 401(k), employee stock grants, employee stock purchase plan, paid time off and up to 12 paid holidays - which total about 4 weeks for new full-time employees and about 2.5 weeks for new part-time employees annually - paid parental and family leave, family building benefits, back-up care, enhanced family support, childcare subsidy, tuition assistance, college coaching, short- and long-term disability, voluntary AD&D coverage, voluntary accident coverage, voluntary life insurance, voluntary disability insurance, and voluntary long-term care insurance. We don't stop there - eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs! To learn about T-Mobile’s amazing benefits, check out www.t-mobilebenefits.com.

Never stop growing!
As part of the T-Mobile team, you know the Un-carrier doesn’t have a corporate ladder–it’s more like a jungle gym of possibilities! We love helping our employees grow in their careers, because it’s that shared drive to aim high that drives our business and our culture forward. By applying for this career opportunity, you’re living our values while investing in your career growth–and we applaud it. You’re unstoppable!

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, the 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.

Talent comes in all forms at the Un-carrier. 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. Please note, this contact channel is not a means to apply for or inquire about a position and we are unable to respond to non-accommodation related requests.