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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Systems Engineer - **Company:** Core One - **Location:** Sterling, VA, United States - **Experience:** Expert - **Salary:** $125,000.0 - $165,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Access Control List, Amazon Web Services, Systems Engineering, Microsoft Azure, Cloud Computing, Configuration Management, Information Systems, System Configuration, Networking Hardware, Virtual Private Networks (VPN), Python (Programming Language), Linux Servers, Network Configuration and Change Management, Routing, Network Segmentation, Windows PowerShell, Ansible, Software Engineering, Virtualization Technology, Network Routers, Scripting, Firewalls (Computer Science), Information Technology, Firewall Services Module, Server Operating Systems & Platforms - **Published:** November 8, 2026 - **Apply:** https://www.careerbuilder.com/job-details/senior-systems-engineer-sterling-va--293719d8-e5c1-4a2c-9070-b0eedc3cec00 ## About the Role Systems Engineering, Willing to Travel, Customer Support/Service, Operational Audit, Team Player, Software Engineering, Information Technology & Information Systems, Systems Engineering, Network Configuration Management, Documentation, * Bachelor's degree in Computer Science, Information Systems, or a related technical field, or 5+ additional years of relevant experience in lieu of education * 5+ years of relevant systems and network engineering experience * Hands-on experience configuring and troubleshooting enterprise routing, switching, and firewall platforms * Experience administering Windows and Linux server environments and virtualization platforms * Working knowledge of cloud networking and hybrid connectivity in AWS or Azure, and proficiency with scripting and shell environments for automation and administration * Must be a U.S. Citizen and hold an active Top Secret (TS) clearance, * Certifications such as CCNA, CCNP, Security+, or AWS Solutions Architect- Associate * Experience with air-gapped, isolated, or closed network environments in secure settings * Experience supporting secure communications and VTC infrastructure * Familiarity with infrastructure-as-code and configuration management practices * Experience supporting multi-site or distributed infrastructure ## Description Sterling, VA (Washington, DC Metro Area) - Minimal travel required to support client engagements, This is a hands-on generalist role for someone comfortable owning a problem from diagnosis through implementation and documentation. The Senior Systems Engineer builds, secures, and sustains the network and systems infrastructure supporting program and customer operations across on-premises, cloud, and hybrid environments - spanning network configuration and troubleshooting, server and virtualization administration, and the security controls that protect both. The role sits within the Strategic Services Division's Engineering Capabilities Group, reporting to the Deputy Program Manager- Technical, and works closely with Software Engineers and Field IT staff in sensitive operating environments. * This position requires an active Top Secret (TS) clearance*, * Configure, maintain, and troubleshoot enterprise network infrastructure, including routers, switches, firewalls, and VPN connectivity across on-premises, cloud, and hybrid environments * Administer physical, virtual, and cloud/hybrid server environments, including hypervisor management, OS patching, storage configuration, and connectivity between cloud and on-premises resources * Implement and maintain firewall rules, access control lists, and network segmentation; harden systems and network devices against established security baselines; and support the Security Operations Center in investigating security events * Develop scripts and automation using tools such as Python, PowerShell, or Ansible to reduce repetitive configuration and administration tasks, and configure monitoring and alerting for network and system health, availability, and performance * Develop and maintain SOPs, network and system diagrams, configuration baselines, and troubleshooting guides * Collaborate with Software Engineers, Field IT staff, and other technical teams, and provide technical guidance and cross-training to Technical Associates and junior staff, The pay range reflected above is a general guideline for this position and labor category and is not a guarantee of a specific salary or offer. Final compensation is determined based on factors including, but not limited to, relevant experience, education, certifications, security clearance level, contract requirements, geographic location, and internal pay equity, and may reflect market data specific to the awarded contract.