Network Security Engineer

At The One 23 Group, our mission is to set the benchmark for excellence in government services. We empower our clients in the Department of War, Intelligence Community, and Federal Civilian sectors to excel with our advanced capabilities. Our dedication lies in fostering a people-first culture, underpinned by steadfast ethical principles. Embracing innovative technologies and process improvements, we are steadfast in our journey toward a future that is both bright and transformative. Our expertise spans Enterprise IT, Mission IT and Cyber. With our global footprint, we place a strong emphasis on nurturing our people and culture, which forms the core of our successful strategies in leadership and financial management. We pride ourselves on our extensive experience and effective approach, ensuring that we lead with both innovation and integrity. THE POSITION The Network Security Engineer is responsible for protecting network infrastructure by implementing and maintaining security controls, monitoring threats, and ensuring compliance with federal cybersecurity requirements. RESPONSIBILITIES: 1. Network Security Operations Implement, operate, configure, maintain, and troubleshoot enterprise network security infrastructure. Monitor network performance, availability, and security events across enterprise systems. Analyze network traffic to identify anomalies, vulnerabilities, or security incidents. Perform incident triage, root cause analysis, and remediation of network security issues. Document incidents, investigations, and resolution activities in IT service management systems. 2. Firewall and VPN Management Deploy, configure, and maintain Fortinet firewall infrastructure (Fortigate, FortiAnalyzer, FortiManager). Support site-to-site VPN services and secure remote access solutions. Maintain firewall policies, perform change requests, and ensure adherence to security best practices. Conduct troubleshooting and performance tuning of firewall and VPN systems 3. Load Balancing and Application Security Configure and manage F5 load balancers and related application delivery infrastructure. Support secure application traffic routing and performance optimization. 4. Monitoring and Security Infrastructure Maintain and support network monitoring platforms including: i. Cisco DNA ii. Cisco Prime iii. LiveAction iv. Xymon 5. Cloud Security Support and secure cloud infrastructure including: i. AWS ii. Microsoft Azure iii. Google Cloud iv. Cloudflare 6. Security Patch Management Ensure security vulnerabilities are remediated within required timelines ADDITIONAL INFORMATION Position located in Washington, DC Requirements Public Trust; AND, Minimum 5+ years of experience in network security engineering or a related field. Experience supporting enterprise firewall and network security solutions. Experience working in enterprise network environments supporting secure connectivity and infrastructure. Familiarity with Zero Trust architecture and Zscaler platforms. Equal opportunity employer, including disability/vets.

Created: 2026-03-12