Sr Site Reliability Engineer, Secure Federal Operations

T-Mobile•Herndon, VA

20h•Hybrid

About The Position

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

Bachelor’s degree in Computer Science, Engineering, Information Technology, or related field plus 3 years of related work experience. Or, advanced degree with 1 year of related experience. Or, combination of education and experience deemed equivalent
4+ 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 be employed in the United States.
Active security clearance or ability to obtain one.

Nice To Haves

AWS Certified DevOps Engineer preferred
Certified Kubernetes Administrator preferred
Google Cloud Certified - Professional DevOps Engineer preferred

Responsibilities

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.