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Senior Network Administrator

https://www.roberthalf.com Logo

Robert Half

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Location:
United States , Seattle, Washington or Portland, Oregon

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Category:
IT - Administration

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Contract Type:
Not provided

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Salary:

45.00 - 50.00 USD / Hour
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Job Description:

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.

Job Responsibility:

  • 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
What we offer:
  • medical
  • vision
  • dental
  • life and disability insurance
  • 401(k) plan

Additional Information:

Job Posted:
April 23, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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