Network Security Engineer

We are looking for a Network Security Engineer to support and strengthen enterprise network operations in San Antonio, Texas. This role focuses on securing and optimizing both on-premises and Azure-based environments while helping maintain reliable connectivity across critical infrastructure. The ideal candidate brings deep hands-on experience with network security technologies, strong troubleshooting ability, and a practical approach to designing scalable, resilient solutions.

Responsibilities:

• Manage and support network infrastructure across Cisco-based on-premises environments and Microsoft Azure networking services to ensure secure, stable performance.

• Diagnose complex network and hardware problems, perform root cause analysis, and restore service for high-impact incidents affecting business operations.

• Evaluate existing network architecture and recommend improvements that align with future capacity, security, and operational requirements.

• Oversee intrusion monitoring activities, investigate suspicious network events, and coordinate timely response actions to reduce security risk.

• Maintain current security signatures, protection features, and related configurations so defensive systems remain effective against emerging threats.

• Design secure network solutions for local data center and Azure Government cloud deployments in accordance with project goals and architectural standards.

• Track and report network performance indicators to support operational reviews, service visibility, and ongoing infrastructure planning.

• Implement firewall policy updates, web filtering adjustments, and other network security changes in accordance with approved requirements.

• Perform lifecycle maintenance activities, including hardware and software upgrades for Cisco switches, Check Point firewalls, and F5 load balancing platforms.

• At least 10 years of overall IT experience, including 5 or more years focused on network design, deployment, and operational support.

• Minimum 5 years of hands-on experience with Check Point security technologies, including firewall administration and intrusion prevention capabilities.

• Minimum 5 years of practical experience with Cisco networking platforms such as Nexus, Catalyst, routers, ASA, and VPN technologies.

• Strong knowledge of Azure networking services, including virtual networks, routing, subnets, ExpressRoute, and network security controls.

• Solid understanding of core networking concepts such as TCP/IP, BGP, subnetting, routing, load balancing, and IPsec.

• Experience working with F5 load balancers and related traffic management solutions in enterprise environments.

• Scripting ability in PowerShell, Python, Bash, or similar languages is preferred.

• Bachelor’s degree in Information Technology, Information Security, or a related field, or four additional years of equivalent network security engineering experience; CCNA required, Azure Network Engineer Associate preferred, and must be a U.S. citizen eligible to obtain and maintain Tier 3 / Level II IT Security Clearance.

Technology Doesn't Change the World, People Do. ®

Robert Half is the world’s first and largest specialized talent solutions firm that connects highly qualified job seekers to opportunities at great companies. We offer contract, temporary and permanent placement solutions for finance and accounting, technology, marketing and creative, legal, and administrative and customer support roles.

Robert Half works to put you in the best position to succeed. We provide access to top jobs, competitive compensation and benefits, and free online training. Stay on top of every opportunity - whenever you choose - even on the go. Download the Robert Half app and get 1-tap apply, notifications of AI-matched jobs, and much more.

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.

© 2025 Robert Half. An Equal Opportunity Employer. M/F/Disability/Veterans. By clicking “Apply Now,” you’re agreeing to Robert Half’s Terms of Use and Privacy Notice.