Senior Systems Engineer - Citadel

We are seeking a highly skilled Senior Systems Engineer to support the Defense Information Systems Agency Citadel mission. The ideal candidate will provide advanced engineering, integration, administration, and operational support for enterprise infrastructure and mission-critical systems in a secure DoD environment.

This role requires a proactive engineer with deep experience in systems architecture, virtualization, automation, cybersecurity compliance, and enterprise operations. The selected candidate will work closely with government stakeholders, cybersecurity teams, network engineers, and mission partners to ensure high availability, performance, and security across the environment., * Design, implement, maintain, and optimize enterprise systems infrastructure supporting DISA Citadel operations

• Engineer and administer Linux server environments in classified (IL6) and unclassified (IL5) networks
• Support virtualization platforms including VMware, Hyper-V, or cloud-based environments
• Develop and maintain system documentation, architecture diagrams, SOPs, and operational procedures
• Perform systems monitoring, troubleshooting, performance tuning, and root-cause analysis
• Support patch management, STIG compliance, vulnerability remediation, and RMF activities
• Collaborate with cybersecurity personnel to ensure compliance with DoD security requirements
• Automate system administration and operational tasks using PowerShell, Bash, Python, or Ansible
• Support backup, disaster recovery, continuity of operations, and high-availability solutions
• Participate in system upgrades, migrations, and technology refresh initiatives
• Provide Tier III escalation support for complex infrastructure issues
• Mentor junior engineers and contribute to technical strategy and process improvement initiatives

• Bachelor's degree in Information Technology, Computer Science, Engineering, or related field (or equivalent experience)

• 8+ years of systems engineering or enterprise infrastructure experience

• Experience supporting DoD or federal government environments

• Strong experience with:

• Red Hat Enterprise Linux

• VMware vSphere/ESXi administration

• Active Directory, DNS, DHCP, Group Policy

• Enterprise storage and backup technologies

• Automation and scripting tools

• Systems monitoring and performance management

Understanding of RMF, STIGs, ACAS, and DoD cybersecurity policies

Active Security+ CE or equivalent DoD 8570/8140 certification

Active Secret clearance required Preferred Qualifications

• VMware VCP, Microsoft, Red Hat, or AWS certifications
• Experience with hybrid cloud environments and automation frameworks
• Familiarity with DevSecOps methodologies and infrastructure-as-code
• Experience supporting large-scale enterprise or mission systems within DISA environments
• Knowledge of Kubernetes, containers, or modern platform engineering concepts

Desired Skills

• Strong analytical and troubleshooting abilities
• Excellent written and verbal communication skills
• Ability to work independently in fast-paced mission environments
• Strong customer engagement and stakeholder coordination experience
• Proven ability to manage competing priorities and operational deadlines

• Support high-impact national defense missions
• Work with cutting-edge enterprise technologies
• Collaborative engineering environment with opportunities for advancement
• Competitive compensation and benefits package
• Opportunity to contribute directly to mission-critical DoD operations

About Semper Valens Solutions:

Semper Valens Solutions, Inc. (SVS) is a Service-Disabled Veteran Owned Small Business (SDVOSB) providing Cost Effective Software and Systems Engineering, Field Support, Training and Full Life cycle Support Management to the DOD and VA community.

At Semper Valens, our vision is to remain a creative, cutting edge and cost-effective solutions provider where our shared intellect, industry experience, and technology excellence, make a positive difference in our customer's success. Our solutions help bridge the gap between IT and business prioritizations to optimize budgets, risks, and operational processes.

We search for outstanding technical professionals, hiring at all levels of the experience spectrum; intermediate, journeyman and senior. Consider us for your career plan.

Semper Valens Solutions is an Equal Opportunity Employer