Sr Software Engineer – Mobile DevOps

T-Mobile•Frisco, WA

About The Position

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! Are you ready to join the Un-carrier movement? The Sr Software Engineer is essential for designing, implementing, and deploying scalable software solutions that meet customer requirements and support high availability environments. This role is focused on mobile DevOps and platform engineering, enabling reliable, scalable CI/CD systems for iOS and Android application delivery. This team is responsible for supporting and managing the delivery infrastructure for T-Life, Metro, and other enterprise mobile applications, ensuring high-quality releases, operational reliability, and a seamless customer experience at scale. The role involves collaborating with engineers to build and operate mobile delivery pipelines and platform infrastructure using cloud-native technologies including CI/CD systems, AWS, Kubernetes, and automated build infrastructure. It requires independent judgment to resolve technical issues and make recommendations for software design, implementation, and end-to-end build and release automation strategies. Success is measured by the ability to deliver effective software solutions that integrate with system protocols and meet business and technical requirements, as well as owning and improving mobile CI/CD pipelines, release reliability, and developer productivity at scale across T-Life, Metro, and enterprise applications. The work impacts organizational capabilities by enabling advanced software systems that improve operational efficiency and customer experience. We pride ourselves on encouraging a culture of innovation, advocating for agile methodologies, and promoting transparency in all that we do. Join us in embodying the spirit of the “Un-carrier” and make a tangible impact! If you're up to the challenge, apply today!

Requirements

4–7+ years of technical engineering experience
Bachelor’s degree with 5+ years of related work experience, or an advanced degree with 3+ years of related experience (Required)
Degree in Computer Science, Software Engineering, Information Management, or equivalent experience (Required)
Strong cross-functional collaboration and stakeholder communication
Technical writing skills
Software engineering or DevOps experience
Strong experience with CI/CD systems (GitLab CI preferred; also GitHub Actions, Jenkins, Bitrise, CircleCI)
Experience with AWS (IAM, S3, EKS, Secrets Manager) and cloud-native architectures
Experience with Kubernetes and containerized workloads
Experience designing and operating CI runners / build infrastructure (ephemeral, autoscaling preferred)
Strong scripting and automation skills (Python, Bash, etc.)
Experience with mobile build systems (iOS or Android)
At least 18 years of age
Legally authorized to work in the United States

Nice To Haves

Experience with fastlane, Gradle, and Xcode build systems
Experience managing mobile code signing, provisioning, and secure credentials
Prior iOS or Android development experience
Experience with observability tools (e.g., Datadog, Prometheus, logging/metrics systems)
Experience integrating AI-assisted tools (e.g., code generation, pipeline optimization, or test automation) into engineering workflows

Responsibilities

Develop and maintain platform tooling and automation that supports mobile build and release workflows
Design, implement, and maintain CI/CD pipelines for iOS and Android applications, including build, test, code signing, and distribution (e.g., TestFlight, Play Store)
Own end-to-end reliability, performance, and scalability of mobile CI/CD pipelines
Build and operate scalable, containerized build infrastructure, including Kubernetes-based ephemeral runners and autoscaling systems
Manage mobile release workflows including code signing, provisioning profiles, secure credential management, artifact storage, and versioning strategies
Optimize pipeline performance through caching, parallelization, and failure recovery mechanisms
Contribute to design innovations that improve systems, processes, or services using modern DevOps and platform engineering best practices
Improve developer experience through automation, tooling, and self-service platform capabilities
Collaborate with technical and mobile engineering teams to deliver solutions and standardize build and release processes across iOS (Xcode, fastlane) and Android (Gradle) ecosystems
Support technology strategy by evaluating and applying current technologies aligned with business goals, including AWS (IAM, S3, EKS), Kubernetes, and cloud-native tooling
Implement observability across CI/CD systems, including pipeline performance metrics (build times, failure rates), logging, alerting, and flaky test detection
Compose clear documentation for software code, system designs, pipelines, and infrastructure to support knowledge sharing
Mentor engineers through technical leadership, knowledge sharing, and DevOps/platform engineering best practices
Perform other duties or projects as assigned by business management