DHA -EOSS Computer Systems Analyst (Windows/RHEL SA OS)

Quantum Sky•Aurora, CO

1d•$152,000 - $162,000•Onsite

About The Position

Quantum Sky is seeking a Senior Computer Systems Analyst to support the Defense Health Agency (DHA) E-Commerce Operational Systems Support (EOSS) contract in Aurora, Colorado. The role serves as the lead Operating System and Infrastructure Administrator responsible for the health, availability, performance, and cybersecurity posture of DHA E-Commerce System (ECS) operating systems hosted in the Medical Community of Interest (MedCOI) AWS GovCloud East environment. The enterprise environment includes Red Hat Enterprise Linux (RHEL 7/8) and Microsoft Windows Server (2016/2019/2022). The analyst administers operating systems supporting DHA ECS applications, including Oracle Federal Financials (OFF R12), the Enterprise Data Warehouse (EDW), PRISM, Management Tracking and Reporting (MTR/PAT), and web/proxy server tiers. The role leads OS upgrades, creates custom Amazon Machine Images (AMIs), implements DISA Security Technical Implementation Guides (STIGs), coordinates with DHA Data Center Operations (DCOPS), and administers user and system accounts through the Application Virtualization Hosting Environment (AVHE). The position supports operating system lifecycle administration across Development, Test, Quality Assurance (Pre-Prod), and Production environments; cloud server provisioning and hardening; cybersecurity remediation and compliance; privileged access administration; outage response; maintenance windows; and disaster recovery exercises. Required qualifications include U.S. citizenship, a qualifying DoD IAT Level II certification, a bachelor’s degree in a related technical discipline or the specified experience substitution, and at least five years of relevant operating system administration experience. An active or favorably adjudicated Tier 3/NACLC background investigation with Secret eligibility is also required.

Requirements

Must be a United States citizen.
Must possess an active DoD 8570.01-M / DoD Manual 8140.03 IAT Level II baseline certification or higher, such as Security+ ce, CCNA-Security, CySA+, GICSP, GSEC, or SSCP.
Must possess or obtain a DoD 8140.03 IAT Level II certification within three months of hire.
Bachelor’s degree from an accredited institution in Computer Science, Information Systems, Computer Engineering, or a related technical discipline; alternatively, 15 years of documented operating system administration experience may substitute for the degree.
At least five years of hands-on operating system administration experience, including installations, configurations, and DISA STIG implementation, in enterprise cloud or virtual environments comparable in size and complexity to the DHA ECS program.
Must possess an active or favorably adjudicated Tier 3/NACLC background investigation (SF-86) with Secret eligibility and be eligible for IT Level II Privileged Access designation before contract start.

Nice To Haves

Red Hat Certified System Administrator (RHCSA) or Microsoft Certified: Windows Server Hybrid Administrator Associate.
Operating Environment certification in Linux or Windows.
Experience supporting DoD/Military Health System systems hosted within MedCOI or DISA DECC data centers.
Working knowledge of AVHE/Citrix VDI.
Familiarity with Oracle 12c/19c database tiers and Oracle WebLogic, Apache HTTP, or IIS application servers.

Responsibilities

Maintain full lifecycle responsibility for RHEL and Windows Server instances across Development, Test, Quality Assurance (Pre-Prod), and Production environments.
Lead operating system deployment, configuration, and migration across technology baselines, including Windows Server and RHEL upgrades, while maintaining application performance.
Administer operating-system-level software, server utilities, server roles and features, Active Directory services, and Group Policy Objects.
Monitor system resources and performance, including memory, processor capacity, storage, and I/O; conduct sizing and capacity planning with DHA DCOPS.
Manage and monitor virtual server instances in the MedCOI AWS GovCloud East environment using the AWS Management Console.
Build, maintain, and harden custom DHA ECS Amazon Machine Images (AMIs) and deployment templates for DCOPS server provisioning.
Coordinate onboarding forms, Change Requests, Support Tickets, and Application Service Interruptions through the DHA Global Service Center ticketing system.
Maintain separation between environments, restricting developer access to Development and Test and preserving the production-equivalent ATO posture of QA/Pre-Prod and Production.
Apply DISA STIGs and maintain STIG checklists for Windows Server and RHEL systems.
Review and remediate vulnerabilities identified by ACAS and HBSS/Trellix scans before production deployment.
Deploy IAVAs, security patches, hotfixes, and vendor service packs within DoD timelines.
Support the ISSO and ISSM with RMF security-control documentation, artifact generation, and annual ATO recertification activities.
Use AVHE/VDI as the secure access path for administrative management of AWS platforms.
Manage system administrator and standard user accounts, process SAAR/DD Form 2875 packages, and coordinate seed accounts with DHA Consolidated SAAR teams.
Enforce DoD PKI/CAC authentication, SSO, and privileged access management policies.
Perform planned OS patching, kernel updates, and server maintenance during designated maintenance windows.
Respond to service disruptions within the specified restoration timeframes and notify Government representatives within the required intervals.
Support biennial CRMSIT environment setup, CARS CTDE automation, IPv6 dual-stack OS configurations, and annual COOP disaster recovery failover exercises.