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Robert Half Logo Robert Half · IT - Administration

Senior Network Security Engineer

United States, Alpharetta · Job Posted March 13, 2026
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Job Description

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.

Job Responsibility

  • 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

Requirements

  • 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

Nice to have

  • Experience designing secure network architectures and micro-segmentation strategies
  • Candidates should be comfortable working in client-facing environments supporting multiple organizations

What we offer

  • medical
  • vision
  • dental
  • life and disability insurance
  • company 401(k) plan
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