> Markdown version of [/jobs/ext/1338521-systems-administrator-ii-ts-sci-required](https://www.wearedevelopers.com/jobs/ext/1338521-systems-administrator-ii-ts-sci-required). 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). --- # Systems Administrator - II (TS/SCI Required) - **Company:** A3 Missions, LLC - **Location:** Goodfellow Air Force Base, TX, United States - **Experience:** Experienced - **Salary:** $96,000.0 - $102,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Cyber Security, Linux, Network Security, Linux System Administration, Software Engineering, Software Systems, Data Storage Technologies, Peripherals, Information Technology, Operational Systems, Server Operating Systems & Platforms, User Accounts - **Published:** July 18, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=e960e3dd6d00e421 ## About the Role * Security+ * Three (3) years of Windows and/or Linux systems administration experience Preferred: * Experience supporting Department of Defense (DoD) environments * Experience leading or coordinating technical teams, * Windows and/or Linux systems administration: 3 years (Required) License/Certification: * CI POLYGRAPH (Required) Security clearance: * Top Secret (Required) ## Description Job Summary: We are seeking a skilled Systems Administrator II to support a mission-critical DoD environment. In this role, you will install, configure, maintain, and troubleshoot Windows and Linux systems while supporting enterprise users, mission applications, and secure network operations. You'll work alongside experienced technical professionals to ensure reliable, secure, and high-performing IT infrastructure supporting national security missions., Systems Administration & Configuration * Plan, coordinate, and install software applications and hardware peripherals on Windows and Linux platforms. * Install, configure, support, and maintain desktop operating systems, server operating systems, hardware, and software. * Provide system administration and configuration of Commercial Off-the-Shelf (COTS) and specialized mission applications. * Participate in the planning, testing, integration, and implementation of new technologies. * Test operating system and software upgrades, patches, and hotfixes before deployment to operational systems. System Performance & Security * Optimize the functionality and performance of hardware and software systems. * Monitor and enhance overall system performance. * Ensure the availability, integrity, efficiency, and reliability of servers, workstations, and data storage systems. * Implement and verify security controls and preventative measures to maintain secure system operations. User Support & Incident Management * Respond to user requests for technical assistance and provide support for hardware and software issues while minimizing mission interruptions. * Diagnose and resolve hardware and software failures. * Identify and resolve common software and hardware problems, questions, and technical issues. * Provide end-to-end incident management for all TRG networks. * Coordinate authorized service interruptions and outages with affected customers. * Respond to unexpected or unauthorized service interruptions and outages. * Dispatch to supported facilities or locations as needed to provide end-user support. User Account Administration * Create, modify, and remove user accounts. * Establish individual user accounts, including email provisioning. * Set and reset user passwords. Documentation & Maintenance * Develop and maintain system administration standard operating procedures (SOPs), technical guides, and work instructions. * Perform hardware repairs on designated server and client systems. Join A3 Missions and support a mission-critical Department of Defense environment where your technical expertise directly enables national security operations. If you're looking to apply your skills in a challenging, mission-focused environment alongside experienced professionals, we'd like to hear from you. Job Types: Full-time, Contract Pay: $96,000.00 - $102,000.00 per year ## Related Videos - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [Full-stack role-based authorization in 45 minutes](https://www.wearedevelopers.com/videos/312-full-stack-role-based-authorization-in-45-minutes) - [Building a Cross-Platform BLE Client with Kotlin Multiplatform and Kable](https://www.wearedevelopers.com/videos/100250-building-a-cross-platform-ble-client-with-kotlin-multiplatform-and-kable) - [Docker network without Docker](https://www.wearedevelopers.com/videos/1418-docker-network-without-docker) - [Swapping Low Latency Data Storage Under High Load](https://www.wearedevelopers.com/videos/746-swapping-low-latency-data-storage-under-high-load) - [Closing Keynote by Joel Spolsky](https://www.wearedevelopers.com/videos/615-closing-keynote-by-joel-spolsky) ## Related Articles - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [What Are The Top Skills Required For Azure Developers?](https://www.wearedevelopers.com/magazine/77-what-are-the-top-skills-required-for-azure-developers) - [Dev Digest 134 - Where pixels sing?](https://www.wearedevelopers.com/magazine/477-dev-digest-134-where-pixels-sing) - [The Most Popular IT Jobs on the Market](https://www.wearedevelopers.com/magazine/376-the-most-popular-it-jobs-on-the-market) - [A Guide to Green Tech and Green IT Careers](https://www.wearedevelopers.com/magazine/374-a-guide-to-green-tech-and-green-it-careers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)