Systems Administrator

Sierra7, Inc.isseekingaSystems Administrator to support the operation, security, and modernization of a complex federal technology environment. This positionmaintainsserver, identity, endpoint, virtualization, collaboration, and cloud services across on-premises and hosted platforms. The role also resolves advanced technical issues, improves automation and monitoring, addresses security weaknesses, and contributes to initiatives involving cloud identity, modern device management, analytics, and artificial intelligence-enabled services. Work Schedule: Monday through Friday, 8:00 a.m. to 5:00 p.m. Eastern Time, excluding federal holidays and Government closures. Occasional evening or weekend work may berequiredfor emergencies, maintenance, incidents, or other mission-critical needs. Position Responsibilities: Administer physical, virtual, and cloud-hosted server environments.Support Windows Server and Linux-based operating systems, including system upgrades, configuration, and maintenance. Manage enterprise identity and directory services, including Active Directory, Microsoft Entra ID, and hybrid identity environments.Support identity synchronization, multifactor authentication, single sign-on, Conditional Access, and related authentication services. Administer endpoint-management and configuration platforms such as Microsoft Intune and Microsoft Configuration Manager. Maintain Microsoft 365 services and other enterprise collaboration platforms. Support virtualization technologies such as Nutanix, VMware, or Hyper-V. Monitor system performance, event logs, infrastructure health, and service availability using enterprise monitoring tools. Investigate and resolve complex production issues involving servers, endpoints, identities, applications, and cloud services. Perform operating-system patching, security hardening, vulnerability remediation, and configuration-baseline maintenance. Develop PowerShell scripts and other automation to reduce repetitive administrative work and improve service consistency. Review and simplify Group Policy configurations and support the transition of endpoint policies to modern management platforms. Create and maintain operating procedures, system documentation, configuration records, and troubleshooting guides. Support security findings and corrective actions through established remediation and risk-management processes. Work with network, cybersecurity, service desk, application, and cloud teams to resolve cross-functional issues. Assist with the evaluation and use of analytics and AI-enabled tools to improve IT operations and user support. Participate in daily system-health reviews, incident response, change management, and planned maintenance activities. Provide technical assistance and guidance to users and other IT personnel. Perform work onsite at least three days per work week, with additional onsite attendance based on operational needs. Support occasional evening or weekend work for incidents, maintenance, upgrades, or other mission-critical needs.