Principal Systems Reliability Engineer, Secure Federal Operations

T-Mobile • Herndon, VA

8d • Hybrid

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! 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. This is a hybrid position required to be in-office at least 2 days a week. T-Mobile requires U.S. citizenship for certain roles within the organization. This role requires U.S. citizenship. Individuals hired into this role will be required to submit documentation proving U.S. citizenship within the first 7 days of hire - failure to do so will result in termination.

Requirements

• Ability to design secure, scalable, and highly available systems across hybrid and cloud environments Integration Cybersecurity Frameworks
• Ability to lead architecture design
• Ability to translate business requirements into secure, scalable technical solutions.
• Performance tuning, capacity planning
• Cloud Computing
• Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field OR equivalent experience
• 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).
• Experience in incident and problem management, root cause analysis, and disaster recovery planning
• 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.
• Individuals hired into this role will be required to submit documentation proving U.S. citizenship within the first 7 days of hire - failure to do so will result in termination

Nice To Haves

• Advanced degree with 5+ years of related experience preferred
• Knowledge of containerization (Docker, Kubernetes) preferred

Responsibilities

• System Architecture & Reliability 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.
• Cloud & Platform Engineering 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.
• Identity & Access Management Administer Active Directory and integrate with cloud identity solutions. Configure 802.1X authentication for secure network access. Manage digital certificates lifecycle (issuance, renewal, revocation)
• Networking & Security Manage DNS, TCP/IP networks, and network segmentation. Implement firewalls, VPNs, and Zero Trust principles. Apply cybersecurity frameworks and monitor vulnerabilities.
• Operating Systems & Patch Management Maintain and secure Windows and Linux servers. Utilize SCCM for patch management and compliance reporting. Perform OS hardening and lifecycle management.
• Microsoft 365 Administration 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.
• Automation & Scripting Develop scripts in PowerShell, Python, or Bash to automate tasks. Support CI/CD pipelines and cloud enablement.
• Monitoring & Incident Management Use APM tools (AppDynamics) and observability platforms (Splunk) for troubleshooting. Participate in incident/problem management and disaster recovery planning.

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.
• 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