> Markdown version of [/jobs/ext/2416476-windows-systems-administrator](https://www.wearedevelopers.com/jobs/ext/2416476-windows-systems-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Windows Systems Administrator - **Company:** Sienna Systems - **Location:** Alexandria, VA, United States - **Experience:** Expert - **Salary:** $112,500.0 - $117,500.0 - **Contract:** Permanent contract - **Skills:** Multitier Architecture, Microsoft Windows, Cloud Computing, Configuration Management, VMware ESX Servers, Monitoring of Systems, Internet Information Services (IIS), Microsoft Software, Microsoft SQL Server, System Center Configuration Manager, Windows Servers, Networking Basics, Performance Tuning, Public Key Infrastructure, Microsoft SharePoint, Single Sign-On, Smart Cards, TCP/IP, Virtualization Technology, Software Distribution, Software Security, Peripherals, Performance Monitor, Patch Management, Cloud Migration, DFS Replication, Plan of Action and Milestones, User Accounts, Vmware - **Published:** August 25, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=8ffc08d6f655de99 ## About the Role * Able to obtain and maintain a Public Trust suitability determination * At least 6 years of systems administration experience * Extensive Windows Server experience * Experience maintaining SCCM and using Microsoft ADS/SMS/SUS/SCCM for software distribution and patch management * Experience managing VMware ESX/ESXi * Experience working with IIS and SQL Server * Experience supporting large internet-facing applications * Strong understanding of TCP/IP and other networking principles * Strong customer support skills * Proven effective written and verbal communication, teaming, and interpersonal skills * Ability to work on multiple tasks at once in a dynamic, fast-paced, team-oriented environment and prioritize effectively, * Prior federal or SSA program experience * Microsoft, VMware, ITIL, or Security+ certification * Experience with SharePoint, PKI infrastructure, single sign-on, smart card services, or DFS replication * Experience supporting cloud migrations and cloud computing services * Familiarity with Section 508 accessibility standards ## Description * Install, rebuild, and configure Windows servers including hardware, peripherals, services, directories, and storage to program and operational standards. * Perform daily system monitoring: verify the integrity and availability of hardware, server resources, and key processes; review system and application logs; confirm scheduled jobs completed. * Run daily backup operations and manage the backup solution, verifying restores, managing media rotation and off-site handling, and performing file archival and purges. * Apply operating system and application security patches and upgrades on a regular cadence, coordinating with the information assurance team for validation and verification. * Remediate Plan of Action and Milestones (POA&M) security findings. * Provide Tier II and Tier III support for complex issues; troubleshoot, repair, and recover from hardware and software failures, keeping affected users and management informed. * Create, modify, and remove user accounts on request. * Manage and maintain virtualized environments and perform performance tuning and resource optimization across CPU, memory, and disk. * Submit change requests to the configuration manager and ensure all system changes are documented. * Develop and maintain installation, configuration, and operational procedures, and contribute to system standards. * Write scripts to automate administration tasks and produce periodic performance reporting to support capacity planning. ## Related Videos - [Hacking MSSQL on Cloud. 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