Network Security Engineer

We are seeking a Senior Network Security Engineer to design, implement, and support secure network infrastructures across multiple client environments. This role is responsible for maintaining high-performing network systems while ensuring strong security controls, segmentation, and threat visibility across enterprise networks.

The ideal candidate has deep experience working within managed services or multi-client environments, supporting complex networking infrastructures and implementing security best practices. This position requires someone comfortable troubleshooting advanced network issues, designing secure architectures, and acting as a senior escalation point for critical incidents.

Key Responsibilities

• Design, deploy, and maintain network infrastructure including routers, switches, wireless networks, and firewalls across multiple client environments.

• Support enterprise LAN, WAN, and wireless connectivity systems to ensure high availability and performance.

• Implement and manage networking protocols such as TCP/IP, VLANs, QoS, RSTP, LACP/LAG, and multicast technologies.

• Implement and maintain network security controls across switching, wireless, and firewall platforms.

• Design secure network segmentation strategies including VLAN segmentation, micro-segmentation, and multi-tenant network architectures.

• Configure and manage firewall policies, NAT rules, and security filtering using least-privilege access principles.

• Implement secure wireless network authentication methods including WPA2/WPA3 enterprise authentication and RADIUS-based access controls.

• Design and maintain private wireless networks supporting role-based or device-based access policies.

• Support modern access control frameworks including Zero Trust Network Access (ZTNA) approaches.

• Implement network access controls such as 802.1X authentication, device profiling, and endpoint-based access policies.

• Monitor network traffic and security events using network analytics tools and firewall telemetry.

• Identify suspicious activity through log analysis, flow monitoring, and threat intelligence indicators.

• Coordinate with security or incident response teams to investigate potential threats and implement containment actions.

• Serve as a Tier 3 escalation point for complex network troubleshooting and infrastructure issues.

• Diagnose and resolve connectivity problems involving routing, switching, wireless networks, and firewall systems.

• Support proactive monitoring and preventative maintenance to maximize uptime.

• Onboard and maintain network infrastructure within monitoring platforms for inventory tracking, alerting, and configuration management.

• Analyze network alerts and performance metrics to identify potential issues before service disruption occurs.

• Maintain detailed documentation of network configurations, security policies, and infrastructure changes.

• Participate in change management reviews and ensure proper documentation for infrastructure updates.

• Work closely with internal engineers and client stakeholders to resolve infrastructure challenges and implement new solutions.

• Provide technical guidance and communicate complex technical findings clearly to both technical and non-technical audiences.

• 5-7+ years of experience designing, implementing, and supporting network infrastructure environments.

• Strong background in network security, firewall administration, routing, and switching technologies.

• Experience working in a Managed Service Provider (MSP) or multi-client environment supporting multiple networks.

• Advanced knowledge of networking protocols and technologies including TCP/IP, DNS, NAT/PAT, VLANs, QoS, routing, and switching concepts.

• Experience implementing secure network segmentation and layered security controls across network infrastructure.

• Hands-on experience with enterprise firewall platforms and network security policies.

• Strong troubleshooting and diagnostic skills across complex network environments.

• Ability to communicate effectively with both technical teams and client stakeholders.

• Experience with networking and wireless platforms from vendors such as Meraki, Fortinet, Ubiquiti, Ruckus, Aruba, Cisco, or similar technologies.

• Experience with firewall platforms such as Fortinet, Palo Alto, SonicWall, or comparable solutions.

• Familiarity with network monitoring and analytics platforms used for infrastructure visibility and alerting.

• Networking certifications such as CCNA, CCNP, Network+, or similar credentials.

• Associate or Bachelor's degree in Information Technology, Computer Information Systems, or a related field.

Additional Details

• Experience designing secure network architectures and micro-segmentation strategies is highly valued.

• Candidates should be comfortable working in client-facing environments supporting multiple organizations.

• Occasional travel to client sites (~10%) may be required, All applicants applying for U.S. job openings must be legally authorized to work in the United States. Benefits are available to contract/temporary professionals, including medical, vision, dental, and life and disability insurance. Hired contract/temporary professionals are also eligible to enroll in our company 401(k) plan. Visit roberthalf.gobenefits.net for more information.

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