Senior Software Engineer (Backend APIs/Platform)

T-Mobile • Bellevue, WA

3d

About The Position

Are you ready to join the Un-carrier movement? We are seeking a Senior Software Engineer to join our Device Insurance Technology team and play a key role in building a new in-house engineering capability. This role will serve as a technical leader and foundational member of a growing team responsible for delivering scalable, reliable API-based platforms. In this role, you will take ownership of existing services, lead new development efforts, and help define engineering practices, architecture patterns, and delivery processes. You will work closely with architects, product partners, and external vendors to deliver integrated, business-critical solutions. This position requires a balance of hands-on development and technical leadership, with a strong focus on ownership, collaboration, and execution in a fast-evolving environment.

Requirements

• Strong proficiency in Java/Spring Boot and SQL (Postgres).
• Hands-on experience with WebClient, Swagger 3.0, and RESTful API development.
• Proficient in cloud platforms, particularly AWS, and containerization (Kubernetes, Docker).
• Solid understanding of event-driven architectures and tools like Apache Kafka.
• Knowledge of CI/CD pipelines and DevOps tools including Docker, SonarQube and Git.
• Experience in monitoring and logging using tools such as Splunk, Grafana.
• Creative thinking, continuous learning, strong communication skills and ability to lead development efforts across globally distributed teams
• Bachelor's Degree plus 5 years of related work experience OR Advanced degree with 3 years of related experience (Required)
• Acceptable areas of study include Computer Science, Software Engineering, Information Management or equivalent experience in field (Required)
• 4-7 years Technical engineering experience. (Required)
• At least 18 years of age
• Legally authorized to work in the United States

Responsibilities

• Design, develop, and maintain Spring Boot-based microservices in a distributed system architecture leveraging engineering best practices and staying compliant with enterprise standards.
• Take ownership of end-to-end feature delivery — from technical design to production deployment and post-release support.
• Ensure APIs are secure, performant, and optimized for integration with external vendor.
• Implement API orchestration including parallel and sequential workflows, data transformation, and security validations.
• Build and run event-driven systems, including consumers and asynchronous flows integrated with other systems.
• Collaborate closely with product, architecture, DevOps, and QA to deliver business-critical features and platform capabilities.
• Contribute to system integration, orchestration, and performance tuning across backend services and data pipelines.
• Analyze and improve engineering workflows, proactively identifying bottlenecks, tech debt, and areas for optimization.
• Provide technical leadership and mentorship to onshore and offshore developers, focusing on design quality and best practices.
• Coordinate with enterprise architects and other engineering teams to align system integration and architecture strategy.
• Conduct code reviews, performance tuning, and issue resolutions to maintain high code quality.
• Stay informed of emerging technologies and industry trends; proactively recommend and implement improvements.
• Write clear technical documentation on feature design, implementation details, and system behavior
• Communicate technical issues and trade-offs effectively with engineers and stakeholders.

Benefits

• 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.
• 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.
• 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.
• eligible employees can also receive mobile service & home internet discounts, pet insurance, and access to commuter and transit programs!

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 5,001-10,000 employees