Senior Systems Administrator IV

Caelum Research Corporation•Aberdeen, MD

1d•Onsite

About The Position

We are seeking a highly skilled Senior Windows Systems Administrator to support a critical government IT services contract. The successful candidate will act as a primary subject matter expert for Windows infrastructure, automation, virtualization, and high-availability systems. This role requires deep technical expertise in Microsoft Windows Server, enterprise production environments, network storage, and virtualization technologies. As a senior member of the team, the candidate will also provide technical guidance, leadership, and mentorship to other IT professionals.

Requirements

DoD Secret clearance required.
High School Diploma / GED: Minimum of 11 years of directly related IT experience.
Associate's degree: Minimum of 9 years of directly related IT experience.
Bachelor's Degree: Minimum of 7 years of directly related IT experience.
Master's Degree: Minimum of 5 years of directly related IT experience.
Must possess a current Security+ certification (or equivalent IAT Level II baseline certification).
Must hold at least one current Computing Environment certification, or be able to obtain one within 6 months of start.
Experience with ESS (e.g., McAfee/Trellix) is required.

Nice To Haves

Experience utilizing the Assured Compliance Assessment Solution (ACAS) for vulnerability scanning, analysis, and compliance reporting.
Familiarity or experience with Linux server operating systems (e.g., RHEL), event and performance monitoring, and associated middleware.
Knowledge of database technologies, including installation and configuration of database management systems and migration of databases.
A Microsoft-based certification (e.g., Microsoft Certified: Windows Server Hybrid Administrator Associate, MCSE) is strongly preferred.

Responsibilities

Install, configure, and manage Microsoft server operating systems, with a heavy emphasis on Windows Server operating systems, Active Directory (AD) configuration, Group Policy (GPO) management, and associated middleware.
Manage a VMware environment, including systems deployment, patching, STIG/hardening, and troubleshooting.
Act as a senior technical resource, providing mentorship, guidance, or team lead support to junior administrators and technical staff; may lead 5 or more employees.
Configure, maintain, and utilize the Elastic Stack (ELK) to ingest, analyze, and visualize system logs and performance metrics across the enterprise to proactively identify system anomalies and security events.
Manage complex production environments using automated installation, automated build and deployment, and automated configuration management frameworks.
Write and utilize operating system commands and scripts to automate routine tasks, utilizing PowerShell and being familiar with others like Python or Bash.
Build, maintain, and support clustered, scalable, and high-availability systems, including load balancing, web servers, application servers, and server virtualization.
Apply foundational networking principles (TCP/IP, firewalls, routing, VLANs) to perform general network troubleshooting and resolve complex system issues.
Utilize enterprise monitoring tools for event and performance monitoring. Conduct performance tuning, capacity planning, and bottleneck resolution.
Apply Defense Information Systems Agency (DISA) Security Technical Implementation Guides (STIGs) to harden systems, remediate advanced security vulnerabilities, manage identity and access configurations, and ensure overall system security compliance. Experience with ESS (e.g., McAfee/Trellix) is required.
Plan and execute seamless operating system upgrades and environment migrations with minimal mission impact.
Support enterprise hardware and storage environments, including CISCO Unified Computing System (UCS) and technologies such as Commvault, NetApp, or VSAN.