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Cyber Defense/Network Security Engineer

JFL Consulting LLC Springfield, VA

Springfield, VA

Today

$155k - $175k/yr Full time Cloud Platforms Computer Network Defense Cyber Defense

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Job Description

JFL Consulting LLC is seeking a Cyber Defense/Network Security Engineer to support secure government environments from an on-site role in Springfield, VA. This position focuses on building and maintaining infrastructure configurations across physical and virtual systems, while also strengthening security operations and compliance alignment with DoD cybersecurity requirements.

Role focus

Handle on-site configuration of servers, storage, and networking hardware within secure environments
Manage Linux and Windows infrastructure, including deployment, configuration, and operational support
Build and administer virtualized environments using Proxmox, VMware ESXi, and Hyper-V
Support security monitoring and operations using platforms including Security Onion, Zeek, Suricata, Wazuh, Splunk, and the Elastic Stack
Maintain infrastructure alignment with DoD cybersecurity frameworks including RMF and STIGs

Key responsibilities

Install, cable, and maintain rack-mounted hardware, including power and cooling components
Apply system hardening, OS patching, logging, and backup strategies across physical and virtual systems
Implement network monitoring using SPAN ports and Gigamon taps
Automate configuration tasks and infrastructure deployments using Bash, Python, or PowerShell
Conduct vulnerability scans and implement security remediation in support of STIGs and RMF
Monitor system health, identify performance or security issues, and remediate in a timely manner
Support incident response, security audits, and continuous compliance efforts
Develop and maintain detailed documentation, including SOPs, network/system diagrams, and baselines
Provide technical recommendations to stakeholders with varying technical expertise
Contribute to compliance reporting and audit readiness through accurate documentation

Required qualifications

TS/SCI Clearance
DoD 8140/8570 IAT Level II certification (examples include Security+, GCIH, CYSA+)
5+ years in a systems engineering or infrastructure role
Experience with Active Directory, DNS, SSO, and authentication protocols
Hands-on virtualization experience with ESXi, Hyper-V, or Proxmox
Cloud platform experience desired: AWS, Azure, or GCP
Advanced knowledge of Linux and Microsoft environments
Strong scripting skills in Python, Bash, or PowerShell
Familiarity with networking concepts including VLANs, routing, NAT, and subnetting
Proficiency with configuration management tools such as Ansible and Puppet
Understanding of cybersecurity fundamentals, system hardening, and monitoring practices
Strong written and verbal communication skills
Ability to produce clear technical documentation and reports
Bachelor’s or Master’s degree in a related field preferred
Systems engineering certifications (examples include Microsoft, Red Hat, VMware, or CompTIA Advanced credentials)

Technologies

Linux, Windows
Proxmox, VMware ESXi, Hyper-V
Bash, Python, PowerShell
Security Onion, Zeek, Suricata, Wazuh, Splunk, Elastic Stack
SPAN ports, Gigamon taps
RMF, STIGs
Active Directory, DNS, SSO
VLANs, routing, NAT, subnetting
Ansible, Puppet
AWS, Azure, GCP

Compensation and benefits

Salary: $155,000 - $175,000 per year
100% employer-paid medical, dental, and vision premiums for employees and dependents
Flexible Spending Accounts (healthcare, dependent care, and commuter)
Life insurance, short-term disability, and long-term disability
401(k) with immediate vesting of company contribution
Generous PTO policy: 15 vacation, 5 sick, 2 personal days, and 11 holidays
Certification reimbursement, dedicated professional development funding, and company-provided access to online learning platforms

Travel

Up to 10-20% travel (CONUS & OCONUS)

Location: Springfield, VA (on-site)

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