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T-Mobile Logo T-Mobile · IT - Software Development

Principal Systems Reliability Engineer

United States, Herndon 114800.00 - 207200.00 USD / Year · Job Posted February 16, 2026
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Job Description

This role is responsible for designing and implementing secure, scalable, and highly reliable technology solutions across cloud platforms, networking, and cybersecurity domains. This role combines advanced expertise in system architecture, cloud engineering (Azure, AWS), and DevSecOps practices to ensure optimal performance, availability, and security of enterprise systems. Key responsibilities include managing identity and access controls, certificate lifecycle, patch management using SCCM, and automation through scripting. Additionally, the role oversees Microsoft 365 (M365) services to ensure seamless collaboration, compliance, and security across productivity platforms. Success is measured by improved security posture, operational efficiency, and enhanced service reliability, directly impacting organizational performance and customer experience.

Job Responsibility

  • Develop and implement system designs to improve software delivery speed and operational efficiency
  • Lead architecture for cross-domain programs ensuring alignment with enterprise standards
  • Deliver solutions that enhance service availability, scalability, latency, and efficiency
  • Design and deploy solutions on Azure and AWS
  • Build and operate cloud-native platforms (Kubernetes, service mesh, ingress, policy engines)
  • Implement Infrastructure as Code (IaC) for automated deployments
  • Administer Active Directory and integrate with cloud identity solutions
  • Configure 802.1X authentication for secure network access
  • Manage digital certificates lifecycle (issuance, renewal, revocation)
  • Manage DNS, TCP/IP networks, and network segmentation
  • Implement firewalls, VPNs, and Zero Trust principles
  • Apply cybersecurity frameworks and monitor vulnerabilities
  • Maintain and secure Windows and Linux servers
  • Utilize SCCM for patch management and compliance reporting
  • Perform OS hardening and lifecycle management
  • Manage M365 services including Exchange Online, SharePoint, Teams, and OneDrive
  • Ensure compliance, security, and availability of collaboration platforms
  • Implement policies for data governance and identity integration with M365
  • Develop scripts in PowerShell, Python, or Bash to automate tasks
  • Support CI/CD pipelines and cloud enablement
  • Use APM tools (AppDynamics) and observability platforms (Splunk) for troubleshooting
  • Participate in incident/problem management and disaster recovery planning

Requirements

  • Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field OR equivalent experience
  • Advanced degree with 5+ years of related experience preferred
  • 7+ years of progressive experience in systems architecture, platform engineering, or site reliability engineering
  • Hands-on experience with Azure and AWS cloud platforms
  • Expertise in Active Directory, DNS, 802.1X, and certificate lifecycle management
  • Strong background in Windows and Linux operating systems
  • Proficiency in TCP/IP networking and network security principles
  • Administration of Microsoft 365 (M365) services (Exchange Online, SharePoint, Teams)
  • Automation and scripting using PowerShell, Python, or Bash preferred
  • Experience working in a cloud environment (public/private)
  • Knowledge of containerization (Docker, Kubernetes) preferred
  • Experience in incident and problem management, root cause analysis, and disaster recovery planning preferred
  • US citizenship (without dual citizenship)
  • At least 18 years of age and legally authorized to work in the United States
  • Active security clearance or ability to obtain one

What we offer

  • Competitive base salary and compensation package
  • Annual stock grant
  • Employee stock purchase plan
  • 401(k)
  • Access to free, year-round money coaches
  • Medical, dental and vision insurance
  • Flexible spending account
  • 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
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