Senior Network Administrator

firstPRO is seeking a Senior Network Administrator to support and enhance a complex enterprise network environment across corporate offices, data centers, and cloud platforms. This individual will be responsible for the administration, implementation, troubleshooting, and ongoing improvement of critical network infrastructure. The ideal candidate will bring strong hands‑on experience with Cisco networking, Fortinet firewalls, Azure/AWS networking, F5 load balancing, and enterprise routing protocols. This is a senior‑level position that combines approximately 50% hands‑on technical work and 50% analysis/project responsibilities, including leading initiatives and mentoring junior team members. Responsibilities Administer and support enterprise network and telecommunications infrastructure across multiple corporate locations and data center environments. Configure, maintain, and troubleshoot routers, switches, firewalls, wireless infrastructure, VPN technologies, and other network services. Monitor network availability, capacity, and performance and proactively identify opportunities for improvement. Troubleshoot complex network incidents and coordinate internal or vendor resources through resolution when necessary. Support Cisco‑based network infrastructure, including Nexus switching, routing, wireless technologies, and Cisco ISE. Administer and troubleshoot Fortinet FortiGate firewalls and related network security technologies. Support cloud networking infrastructure across Microsoft Azure and AWS. Manage and support F5 BIG‑IP load balancers, including advanced functionality such as web application firewall capabilities. Configure and troubleshoot dynamic routing protocols, particularly BGP and OSPF. Assist with the evaluation and implementation of emerging networking technologies, including Cisco Meraki and Juniper solutions. Gather technical and business requirements and translate them into effective network solutions and system designs. Analyze network traffic, system dependencies, and data flows to support infrastructure planning and troubleshooting. Lead and contribute to network projects, including planning, testing, implementation, documentation, risk management, and knowledge transfer. Coordinate network upgrades, hardware refreshes, lifecycle management, and replacement of legacy equipment. Maintain appropriate network access controls and security standards. Support disaster recovery and network restoration efforts following infrastructure outages or failures. Develop and maintain network diagrams, configurations, procedures, standards, and technical documentation. Provide escalation support for complex issues that cannot be resolved by Help Desk or junior technical resources. Mentor junior team members and provide technical direction during projects and troubleshooting efforts. Lead assigned project work and coordinate or delegate technical activities as appropriate. Evaluate new technologies and recommend solutions that improve network performance, reliability, security, or operational efficiency. Requirements 4–6+ years of enterprise networking experience in a Network Administrator, Network Engineer, or similar infrastructure role. Strong hands‑on experience with Cisco networking technologies, including routing, switching, wireless, and ideally Nexus and ISE. Experience administering Fortinet FortiGate firewalls. Experience supporting cloud networking within Microsoft Azure and/or AWS. Experience with F5 BIG‑IP load balancing technologies; exposure to WAF functionality is strongly preferred. Strong knowledge of enterprise routing protocols, particularly BGP and OSPF. Solid understanding of network protocols, connectivity, security, performance monitoring, and troubleshooting. Experience supporting enterprise network environments spanning multiple locations and/or data centers. Ability to independently troubleshoot complex technical issues and coordinate with vendors when escalation is required. Experience leading or contributing to infrastructure projects from planning through implementation. Strong analytical skills with the ability to evaluate technical requirements and recommend appropriate solutions. Excellent communication, organization, and prioritization skills. Self‑directed and comfortable taking ownership of technical initiatives. Ability to balance hands‑on technical responsibilities with analysis and project‑based work. Experience mentoring or providing technical guidance to junior team members. Knowledge of Ansible or other network automation technologies is a plus. Exposure to Cisco Meraki and/or Juniper networking technologies is a plus. Bachelor's degree in a related field preferred; relevant professional experience may be considered in place of a degree. #J-18808-Ljbffr firstPRO, Inc