Senior Network Administrator

About the Role

Robert Half is seeking a Senior Network Administrator to lead the design, planning, security, and ongoing operations of a multi-site, enterprise network environment across North America. This role will play a key part in driving network strategy, implementing scalable solutions, and ensuring high availability and security across all systems.

Responsibilities

• Own the design, implementation, and management of enterprise network infrastructure across multiple locations
• Develop and propose a strategic roadmap for adopting new network technologies
• Maintain and enhance network security, including internal and perimeter protections
• Perform real-time network monitoring and respond to security threats, malware, and intrusion attempts
• Ensure high availability and reliability through proactive monitoring, redundancy, and fault tolerance planning
• Conduct traffic and capacity analysis to optimize network performance
• Manage and support LAN, WAN, SD-WAN, SAN, and internet services across all sites
• Administer and troubleshoot Fortinet environments (FortiGate, FortiOS, VPN, wireless)
• Manage remote access solutions, including site-to-site VPNs and RADIUS
• Partner with infrastructure teams on endpoint security and network configurations
• Maintain relationships with vendors and service providers, driving issues through resolution
• Create and maintain technical documentation, including network design and processes
• Research and recommend emerging technologies to improve performance and security
• Provide escalation support to Desktop Support and other IT teams
• Participate in on-call rotation for after-hours and weekend support as needed

Requirements

• Strong experience managing enterprise, multi-site network environments
• Hands-on expertise with Fortinet technologies (FortiGate, FortiOS, VPN, wireless)
• Deep understanding of network security, intrusion detection, and threat response
• Experience with SD-WAN, routing/switching, and network optimization
• Familiarity with RADIUS, VPN technologies, and remote access solutions
• Proven ability to design and implement scalable network architectures
• Strong troubleshooting skills across network, security, and connectivity issues
• Experience working with vendors and managing service providers
• Ability to balance strategic planning with hands-on execution
• Strong documentation and communication skills

Nice to Have

• Experience with network monitoring and analytics tools
• Background in high-availability environments with redundancy planning
• Exposure to enterprise security frameworks and compliance standards

Pay

$45-$50/hourly (W2)

Schedule

Long-term contract; hybrid in Seattle, Washington or Portland, Oregon. On-call rotation for after-hours and weekend support as needed.

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