Sr Engineer, Software

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.

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.
• 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.
• 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.
• 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).
• 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.

Pay Range

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.

Benefits

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, copy and paste this link into your browser: https://paylookup.t-mobile.com/paylookup?reqID=REQ340458.

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.