Systems Administrator with Security Clearance

Cornerstone Defense LLC; Dahlgren (VA); On-site; USD 75,000 - 110,000; Full time

Job summary

Cornerstone Defense LLC is seeking a Systems Administrator to support multiple locations including Dahlgren, VA, San Diego, CA, and Norfolk, VA. The role requires active security clearance and hands-on experience with enterprise IT infrastructure, networks, and security best practices.

You will manage servers, virtualization, and remote access, ensuring reliability and compliance with policy. Ideal candidates have strong knowledge of TCP/IP, VPNs, LAN/WAN, and system hardening, and can operate

Qualifications

• Four (4) years of system management experience and Network Infrastructure familiarity.
• Strong understanding of networking concepts, protocols, and security methodologies.
• LAN/WAN architecture and pathways knowledge.
• TCP/IP, ITIL, and network traffic flow experience; OS hardening techniques.

Skills

System management

Networking concepts

Security methodologies

VPN security

OS hardening

LAN/WAN architecture

TCP/IP

Remote access technologies

Tools

VM management

Firewall configuration

Job description

Title: Systems Administrator Location: Dahlgren, VA / San Diego, CA / Norfolk, VA (3 different locations)

• Clearance:
• Active Secret w/ Polygraph needed to apply
• Company Overview: Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation's toughest and most secure problems. If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don't look any further than Cornerstone Defense. Benefits Overview : Cornerstone Defense offers a very comprehensive benefits package including, but not limited to: Medical, Dental and Vision Plans
• Generous PTO Policy
• 401(k)
• HSA and FSA options
• Life and Disability Insurance
• Tuition Reimbursement and Training
• Perks at Work Discount Program
• Referral Program
• Leads Generation Program
• CollegeAmerica 529
• Fitness Reimbursement Program
• Travel Assistance
• Norton Lifelock Benefit Solutions
• Life Planning Financial & Legal Services *
• Four (4) years of system management experience Network Infrastructure
• Networking concepts, protocols, and security methodologies
• LAN/WAN architecture and pathways
• Bandwidth management principles
• Network traffic flow (TCP/IP, OSI, ITIL)
• Performance tuning tools and techniques
• Remote access technologies
• VPN security
• Network protocols (TCP/IP, DHCP, DNS, directory services)
• Common tools (ping, traceroute, nslookup)
• File system implementations (NTFS, FAT, EXT)
• Virtualization technologies and VM management Security Expertise
• IT security principles (firewalls, DMZs, encryption)
• Network security architecture (topology, protocols, defense-in-depth)
• Cybersecurity principles, threats, and vulnerabilities
• National/international cybersecurity laws, regulations, and policies
• Organizational IT security policies (account management, access control)
• Data security standards (PII, PCI, PHI)
• System administration, network, and OS hardening techniques
• Software-based protection tools (firewalls, antivirus, anti-spyware)
• Transmission methods (Bluetooth, RFID, IR, Wi-Fi) and jamming techniques System Administration
• Server and client operating systems
• Systems administration concepts and best practices
• Enterprise IT architecture
• Diagnostic tools and fault identification
• OS command line utilities (ipconfig, netstat, dir, nbtstat)
• System maintenance procedures (cleaning, disk checks, reboots, backups) Cloud Computing
• Service models (SaaS, IaaS, PaaS)
• Deployment models (private, public, hybrid)
• Cloud security strategy and architecture