Sr. Network Engineer III - Security

About

As a Sr. Network Security Engineer III, you'll provide hands-on expertise in securing mission-critical networks for a high-visibility customer to make an impact across the federal government. Our team is responsible for designing, operating, and hardening complex security environments, and you'll play a critical role in strengthening, scaling, and protecting these environments while enabling secure mission delivery across the organization.

This position is designated as essential personnel supporting continuity of operations and may require work during government shutdowns, emergencies, or other critical situations.

Responsibilities

• Design, implement, and manage next-generation firewalls, VPN solutions, intrusion prevention systems (IPS), IDS, and network access control (NAC) platforms in mission-critical environments
• Secure network perimeters and internal network segments, including policy design, segmentation, and threat mitigation using defense-in-depth strategies
• Deploy and manage firewall rule sets, VPN tunnels, and security policies across enterprise environments
• Administer and support enterprise security platforms such as Palo Alto Networks, Fortinet, Cisco (including Cisco ISE and Cisco ASA)
• Implement and support Zero Trust architectures and identity-centric network security models
• Perform endpoint configuration hardening and maintain secure network environments
• Respond rapidly to security incidents, vulnerabilities, and operational needs with urgency and discipline
• Drive continuous security hardening and ongoing improvement of network infrastructure
• Participate in Agile execution, technical planning, and security risk discussions
• Communicate security impacts, risks, and mitigation strategies to both technical and non-technical stakeholders
• Recommend and implement security architecture and operational enhancements
• Serve as a hands-on technical SME, contributing immediately with minimal ramp-up in a mission-critical environment
• Build and maintain high levels of customer trust through reliable, secure delivery
• Apply strong engineering judgment and creativity to deliver practical, mission-focused security solutions

Qualifications

• Bachelor's degree in a technical field is preferred. Relevant experience may substitute for education requirements.
• Active U.S. Top Secret clearance required; must be eligible for expedited SCI read-in (recent, in-scope investigation required; prior TS/SCI and polygraph preferred).
• Security+ (also satisfies DoD 8140 requirements for the 441 Network Operations Specialist work role)
• At least one platform-specific security certification (e.g., PCNSE, Fortinet NSE, or Cisco security certification)
• CCIE Security or CCIE Enterprise Infrastructure is preferred
• 10+ years of experience in network engineering with a primary focus on enterprise network security infrastructure.
• Demonstrated subject matter expertise designing, implementing, and managing next-generation firewalls, VPN solutions, intrusion prevention systems, and network access control platforms.
• Hands-on experience securing network perimeters and internal network segments, including policy design, segmentation, and threat mitigation.
• Operational experience deploying and managing firewall rule sets, VPN tunnels, and security policies in mission-critical environments.
• Hands-on experience with at least one enterprise security platform, such as Palo Alto Networks, Fortinet, or Cisco security technologies.
• Hands-on experience with Cisco ISE and Cisco ASA environments.
• Hands-on experience with IDS and IPS solutions and endpoint configuration hardening in secure environments.
• Experience supporting Zero Trust architectures and identity-centric network security patterns.
• Ability to contribute immediately with minimal ramp-up in a mission-critical operational environment.

Salary

SALARY RANGE: $230K - $320K

The salary range for this position is determined based on qualifications, skills, and relevant experience. The final salary offered will be determined based on several factors, including:

• The candidate's professional background and relevant work experience
• The specific responsibilities of the role and organizational needs
• Internal equity and alignment with current team compensation

This role is also eligible for additional compensation, subject to the terms and policies, which may include:

• Performance-based bonuses
• Company-paid training and/or certifications

About KORE1

Specializing in professional and technical recruiting, KORE1 is committed to supporting top IT, Engineering, Creative, Scientific, Accounting and Finance professionals in their career paths. We build deep relationships with leading companies, connecting them to exceptional talent every day. With extensive industry expertise and unmatched opportunities, our goal is to provide a unique experience for our contractors and consultants as they prepare for their next role. We are passionate about matching the right people with the right companies.

Kore1 provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, national origin, age, disability or genetics. In addition to federal law requirements, Kore1 complies with applicable state and local laws governing nondiscrimination in employment in every location in which the company has facilities. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training. Kore1 expressly prohibits any form of workplace harassment based on race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, genetic information, disability, or veteran status. Improper interference with the ability of Kore1's employees to perform their job duties may result in discipline up to and including discharge.