Systems Administrator 3 - Windows, Linux & AWS

NineFX is seeking a highly experienced System Administrator Level 3 to lead administration, maintenance, optimization, and troubleshooting across complex hybrid enterprise environments. This position provides senior-level support for Windows and Linux systems, AWS cloud workloads, automation frameworks, and enterprise security tools operating within a high-security federal setting.

The SA3 serves as an escalation point for Tier 1 and Tier 2 issues, performs capacity and performance analysis, supports architecture discussions, and helps ensure mission systems remain secure, available, and compliant with DoD/IC standards., Windows & Linux System Administration

• Administer Windows Server 2019/2022, Active Directory, DNS, Certificate Authorities, and Windows 10/11 clients
• Administer and troubleshoot Linux environments (RHEL 8/9, Amazon Linux 2023) in both cloud and hybrid infrastructures
• Install, configure, maintain, and troubleshoot OS software, storage components, network interfaces, and system services
• Implement OS-level improvements to strengthen availability, stability, performance, and security

• Support system patching, update lifecycles, and configuration management compliance AWS Cloud Administration

• Deploy, configure, and maintain AWS core services including EC2, S3, VPC, IAM, CloudWatch, and related environments
• Administer hybrid architectures integrating AWS workloads with on-premises systems
• Conduct cloud monitoring, log analysis, cost/utilization reviews, and resource optimization
• Support secure cloud configurations in accordance with DoD/IC cybersecurity standards

Automation & Configuration Management

• Create and maintain automation using SaltStack, Ansible, Bash, and Python
• Develop repeatable provisioning and baseline enforcement workflows
• Enhance deployment velocity and consistency through automated CM pipelines
• Maintain configuration integrity across multi-OS, multi-cloud environments

Enterprise Security Operations

• Deploy, configure, and maintain Trellix/McAfee agents, ePO servers, Tenable Nessus agents, and BigFix
• Identify, assess, track, and remediate security vulnerabilities across Windows, Linux, and AWS systems
• Support compliance with federal hardening requirements, agency policies, and cybersecurity frameworks
• Maintain security documentation and support audit, reporting, and verification activities

Tier 1 & Tier 2 Support

• Provide initial diagnosis and support for Help Desk tickets and end-user requests
• Serve as Tier 2 escalation for complex system, application, or hardware issues
• Deliver detailed technical analysis and updates to agency leadership on escalated incidents
• Support dispatch activities and maintain engagement through issue resolution

Operations, Troubleshooting & Architecture Support

• Provide daily operational support across client/server, storage, cloud, and mobile device environments
• Diagnose and resolve complex system interactions involving hardware, OS, virtualization, networking, and cloud components
• Support system architecture discussions and assist in designing mission systems and supporting infrastructure
• Maintain awareness of system dependencies within distributed or SOA-based environments

• Active TS/SCI with Full-Scope Polygraph (must already be held)
• IAT Level II (Security+ CE, GSEC, CySA+, CCNA Security, or GICSP)
• 15 years of System Administration experience supporting similar scope and complexity
• Bachelor’s degree in a technical discipline
• Five additional years of System Administration experience may substitute

Preferred Skills

• AWS administration (EC2, S3, VPC, IAM)
• Linux (RHEL 8/9, Amazon Linux 2023)
• Windows Server 2019/2022, Active Directory, DNS, Certificate Authorities
• SaltStack, Ansible, Bash, Python
• Trellix/McAfee, Nessus, BigFix, vulnerability remediation