JFL Consulting LLC

Oct 10, 2026

Cyber Defense/Network Security Engineer

United States

Fairfax County, Virginia, United States

PythonAWSGCP

Description

Job Title: Cyber Defense/Network Security Engineer

Job Overview

JFL Consulting is seeking a skilled Cyber Defense/Network Security Engineer to lead and support site configurations across secure government environments. This position is focused on configuring, deploying, and optimizing both Linux and Windows-based systems, with a heavy emphasis on on-site system setup, hardware implementation, and secure environment integration. Candidates should have experience working hands-on with servers, virtualization technologies, and scripting, while applying cybersecurity best practices in accordance with DoD standards.

Place of Performance: Springfield, VA

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

Requirements

Mandatory Requirements: TS/SCI Clearance

Experience Level: Mid-Sr Level (5+ years)

Required Certifications

Minimum DoD 8140/8570 IAT Level II certification (e.g., Security+, GCIH, CYSA+)

Experience

5+ years in a systems engineering or infrastructure role

Experience with Active Directory, DNS, SSO, and authentication protocols

Hands-on experience with virtualization platforms (ESXi, Hyper-V, or Proxmox)

Experience with cloud platforms (AWS, Azure, or GCP desirable)

Technical Skills

Advanced knowledge of Linux and Microsoft environments

Strong scripting skills (Python, Bash, or PowerShell)

Familiarity with networking concepts: VLANs, routing, NAT, subnetting

Proficiency with configuration management tools (e.g., Ansible, Puppet)

Understanding of cybersecurity fundamentals, system hardening, and monitoring practices

Communication

Strong written and verbal communication skills

Ability to produce clear technical documentation and reports

Strong written and verbal communication skills, with the ability to produce technical documentation and reports

About JFL Consulting

With more than 20 years of securing some of the U.S. Department of Defense and the Intelligence Community’s most critical networks, JFL Consulting, LLC provides advanced network security solutions to a range of US Government and US commercial clients. Our cybersecurity operators are experts at assessing and defending mission-critical data and the networks that facilitate their operation. We are focused on delivering advanced products and industry best practices that meet each customer’s unique requirements. Visit jflconsulting.com

JFL Consulting, LLC is an Equal Opportunity Employer. We do not discriminate against any applicant for employment on any legally recognized basis including, but not limited to: race, religion or creed, color, national origin, sex, age, disability, marital status, sexual orientation, genetic information, veteran status, status with regard to public assistance or any other protected class under federal, state or local statute. It is also the policy of JFL Consulting, LLC to provide reasonable accommodations for qualified individuals with disabilities.

What We Offer

Salary: $155k- $175k

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, 11 holidays)

We support your growth through certification reimbursement, dedicated professional development funding, and company-provided access to online learning platforms

Key Responsibilities

Site Configuration & Infrastructure Management

Perform on-site configuration of servers, storage, and networking hardware in secure environments

Install, cable, and maintain rack-mounted hardware, including power and cooling components

Deploy, configure, and support infrastructure for Linux and Windows systems

Build and administer virtualized environments using Proxmox, VMware ESXi, and Hyper-V

Apply system hardening, OS patching, logging, and backup strategies across physical and virtual systems

Implement network monitoring tools such as SPAN ports and Gigamon taps

Ensure infrastructure aligns with DoD cybersecurity frameworks, including RMF and STIGs

Automate configuration tasks and infrastructure deployments using Bash, Python, or PowerShell

5-10% Conus Travel

Security Operations & Monitoring

Operate and maintain security platforms: Security Onion, Zeek, Suricata, Wazuh, Splunk, Elastic Stack

Conduct vulnerability scans and implement appropriate security remediation in support of STIGs and RMF

Monitor system health, identify performance or security issues, and execute timely remediation

Support incident response, security audits, and continuous compliance efforts

Documentation & Technical Communication

Develop and maintain detailed documentation: SOPs, network/system diagrams, and baselines

Present technical recommendations to stakeholders with varying levels of technical expertise

Contribute to compliance reporting and audit readiness through accurate documentation

Preferred Education, Experience, & Skills

Bachelor’s or Master’s degree in a related field preferred

Systems engineering certifications (e.g., Microsoft, Red Hat, VMware, CompTIA Advanced credentials)

Languages