T-Mobile · 5 hours ago
Sr Engineer, Software
Bellevue, WA
Full-time
Hybrid
Mid, Senior Level
$114K/yr - $205K/yr
7+ years expT-Mobile is a leading telecommunications company, and they are seeking a highly skilled Senior Software Engineer to join their T-Life Backend Engineering team. The role involves developing Java-based microservices and APIs that support millions of users, enhancing T-Mobile’s digital ecosystem with scalable and secure solutions.
InternetMobileTelecommunicationsWireless
Responsibilities
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
Qualification
Required
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
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
Benefits
Medical, dental and vision insurance
Flexible spending account
401(k)
Employee stock grants
Employee stock purchase plan
Paid time off
Up to 12 paid holidays
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
Voluntary long-term care insurance
Mobile service & home internet discounts
Pet insurance
Access to commuter and transit programs
Company
T-Mobile
T-Mobile is a telecommunications company that provides wireless communication services, including mobile phone and internet services. It is a sub-organization of Deutsche Telekom.
10001+ employees
H1B Sponsorship
T-Mobile has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (533)
2024 (457)
2023 (433)
2022 (674)
2021 (522)
2020 (320)
Funding
Current Stage
Public CompanyTotal Funding
$25.37B2026-01-06Post Ipo Debt· $10B
2025-10-06Post Ipo Debt· $2.8B
2024-09-23Post Ipo Debt· $2.5B
Leadership Team
John Saw
President of Technology, Chief Technology Officer
Peter Osvaldik
EVP & CFO
Recent News
2026-01-11
2026-01-11
2026-01-11
Company data provided by crunchbase