DHA -EOSS Computer Systems Analyst (Windows/RHEL SA OS)
Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Oct 19, 2026.
Description
Quantum Sky is searching for an experienced, high-caliber Senior Computer Systems Analyst (Windows/RHEL SA OS) to support the Defense Health Agency (DHA) E-Commerce Operational Systems Support (EOSS) contract in Aurora, Colorado.
In this mission-critical role, you will serve as the lead Operating System (OS) and Infrastructure Administrator responsible for the health, availability, performance, and cybersecurity posture of all DHA E-Commerce System (ECS) operating systems. The DHA ECS hosting environment resides in the Medical Community of Interest (MedCOI) AWS GovCloud East and comprises an enterprise dual-OS architecture consisting of Red Hat Enterprise Linux (RHEL 7/8) and Microsoft Windows Server (2016/2019/2022).
You will manage and configure operating systems supporting all core 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. You will lead OS upgrades, author custom Amazon Machine Images (AMIs), execute DISA Security Technical Implementation Guides (STIGs), coordinate with DHA Data Center Operations (DCOPS), and administer user and system-level accounts via the Application Virtualization Hosting Environment (AVHE).
Responsibilities:
1. Operating System Administration & Maintenance
Serve as the Senior System Administrator maintaining full lifecycle responsibility for all RHEL and Windows Server operating system instances across Development, Test, Quality Assurance (Pre-Prod), and Production environments.
Lead the deployment, configuration, and migration of operating systems across major technology baselines (e.g., upgrading Windows Server 2016/2018 to Windows Server 2022, and RHEL 7 to RHEL 8/9) ensuring uninterrupted application performance.
Administer OS-level executive software, server utilities, server roles and features, Active Directory services, and Group Policy Objects (GPOs) to maintain system consistency and policy enforcement.
Monitor system resource utilization, memory, processor capacity, storage, and I/O performance; conduct sizing and capacity planning in coordination with DHA DCOPS.
2. Cloud Infrastructure & AWS AMI Management
Utilize the AWS Management Console to manage and monitor virtual server instances within the MedCOI AWS GovCloud East environment.
Build, maintain, and harden custom DHA ECS Amazon Machine Images (AMIs) and deployment templates for distribution to the DCOPS Onboarding Team for rapid server provisioning .
Coordinate onboarding forms, Change Requests (CRQs), Support Tickets, and Application Service Interruptions (ASIs) through the DHA Global Service Center (GSC) ticketing system for infrastructure modifications.
Ensure strict segregation of environments: ensure developer access is restricted to Development and Test, while maintaining the production-equivalent ATO posture of the QA/Pre-Prod and Production environments.
3. Cybersecurity Hardening, STIG Implementation & Vulnerability Remediation
Apply DISA Security Technical Implementation Guides (STIGs) and maintain STIG checklists across all Windows Server and RHEL operating systems.
Continuously review and remediate vulnerabilities identified by the Assured Compliance Assessment Solution (ACAS) and Host Based Security System (HBSS) / Trellix scans, resolving operating system findings prior to production deployment.
Deploy Information Assurance Vulnerability Alerts (IAVAs), security patches, hotfixes, and vendor service packs within mandated DoD timelines, eliminating the need for unapproved Plans of Action and Milestones (POA&Ms).
Support the Information System Security Officer (ISSO) and Information System Security Manager (ISSM) in documenting RMF security controls, artifact generation, and annual Authority to Operate (ATO) re-certification activities.
4. Privileged Access Administration & AVHE Virtual Connectivity
Utilize the DHA DCOPS Application Virtualization Hosting Environment (AVHE) / Virtual Desktop Infrastructure (VDI) as the required secure access path for administrative management of all AWS platforms.
Act as the designated Point of Contact (POC) for managing system administrator (SA) and standard user accounts; process System Authorization Access Request (SAAR / DD Form 2875) packages and coordinate seed accounts with DHA Consolidated SAAR teams.
Enforce DoD Public Key Infrastructure (PKI) / Common Access Card (CAC) authentication, Single Sign-On (SSO), and privileged access management policies.
5. Operational Availability, Outage Resolution & Maintenance Windows
Support the DHA ECS Operational Schedule (PWS Table 2), executing planned OS patching, kernel updates, and server maintenance during designated maintenance windows (Monday-Friday 1800-0600 MT; Saturday-Sunday scheduled windows).
Respond to unscheduled service disruptions in strict adherence to contract SLAs:
Month-End / Year-End / October Cycle: Restore production service disruptions within a maximum allowable downtime of 4 hours.
Standard Operations: Restore production outages within 8 hours; non-production (Dev/Test/QA) within 24 hours.
Outage Notifications: Notify Government representatives within 30 minutes of a production issue and within 2 hours for lower environments.
Support biennial CRM System Integration Test (CRMSIT) environment setup, CARS CTDE automation support, IPv6 dual-stack OS configurations, and annual Continuity of Operations (COOP) disaster recovery failover exercises.
Qualifications
Required:
Citizenship: Must be a United States Citizen (mandatory requirement for DoD background investigation, NACLC T3 clearance, and DHA network access).
- DoD 8140 / 8570 Baseline Certification: Active DoD 8570.01-M / DoD Manual 8140.03 IAT Level II baseline certification (e.g., CompTIA Security+ ce, CCNA-Security, CySA+, GICSP, GSEC, SSCP) or higher.
- Cybersecurity Certification: Must possess or obtain a DoD 8140.03 IAT Level II certification within three (3) months of hire.
Formal Education: Bachelor’s degree from an accredited institution in Computer Science, Information Systems, Computer Engineering, or a related technical discipline.
Experience Substitution Rule: Fifteen (15) years of documented operating system administration experience may be substituted in lieu of a bachelor’s degree.
Years of Experience: Minimum of five (5) years of hands-on Operating System administration experience (including installations, configurations, and DISA STIGing) in enterprise cloud or virtual environments comparable in size and complexity to the DHA ECS program.
Desired:
Red Hat Certified System Administrator (RHCSA) or Microsoft Certified: Windows Server Hybrid Administrator Associate.
Operating Environment (OE) certification in Linux or Windows.
Experience supporting DoD / Military Health System (MHS) systems hosted within MedCOI or DISA DECC data centers.
Working knowledge of Application Virtualization Hosting Environment (AVHE / Citrix VDI).
Familiarity with supporting database tiers (Oracle 12c/19c) and application servers (Oracle WebLogic, Apache HTTP, IIS).
Clearance:
- Must possess an active or favorably adjudicated Tier 3 (T3) / National Agency Check with Law and Credit (NACLC) background investigation (SF-86) with Secret eligibility, and be eligible for an IT Level II Privileged Access designation prior to contract start.
Location:
- Aurora, CO
About Quantum Sky
Compensation:
- Compensation is unique to each candidate and relative to the skills and experience they bring to the position. The salary range for this position is typically between $152,000-$162,000. This does not guarantee a specific salary as compensation is based upon multiple factors such as education, experience, certifications, and other requirements, and may fall outside of the above-stated range.
Benefits:
- Highlights of our benefits include Health/Dental/Vision, 401(k) match, Paid Time Off, STD/LTD/Life Insurance, Referral Bonuses, professional development reimbursement, and parental leave.
The world the mission operates in is going post-quantum, contested, and machine-speed. Quantum Sky engineers the advantage across cyber, networks, software, and quantum because the mission demands dominance, not parity. We don't follow the map. We draw it.
At Quantum Sky, we believe that success starts with our people. We foster a collaborative, innovative, and mission-driven environment where every team member plays a critical role in shaping the future of technology. Are you ready to join #TeamQuantumSky?
Quantum Sky Engineering LLC is an Equal Opportunity Employer; all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, [sexual orientation, gender identity,] national origin, disability, status as a protected veteran, or any characteristic protected by applicable law.