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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Network Security Engineer - **Company:** International SOS - **Location:** San Antonio, TX, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Secure Shell (SSH), Microsoft Azure, Bash Shell, Catalyst (Software), Cyber Security, Computer Networks, Domain Name System (DNS), Hypertext Transfer Protocols (HTTP), Intrusion Detection and Prevention, Subnetting, Virtual Private Networks (VPN), Python (Programming Language), Network Security, Network Architecture, Routing, Network Protocols, Cisco Nexus Switches, Windows PowerShell, TCP/IP, Virtual Local Area Networks, Automated Data Processing (ADP), Computer Networking Systems, Transport Layer Security, Load Balancing, Firewalls (Computer Science), Web Filtering, Information Technology, 3-tier Architectures, Cisco Switches, Cisco - **Published:** August 10, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=3553516c5ddb41ed ## About the Role International SOS is looking for a talented Sr. Network Security Engineer to help secure, design, operate, and maintain its IT network and security infrastructure for a key government contract. The ideal candidate would have a passion for solving technical problems and a drive for continually assessing and improving the technical environment in which they operate., * Cisco Nexus and Catalyst Switches * Checkpoint Firewalls and Intrusion Prevention * F5 Load Balancers * Microsoft Azure Networking (Virtual networks, Routing, Subnets, Express Route, VPN, Network Security Groups) * Networking Protocols/Concepts (Routing, VLAN, Subnetting, Load balancing, TCP/IP, DNS, HTTP, TLS, SSH) * Script Experience a plus - PowerShell, Python, Bash, or similar, * Goal/results focused. * Strong ability to analyse and solve problems. * Self-starter. * Available to manage multiple competing demands. * Comfortable with ambiguity. Required Work Experience * 5+ Experience designing, building, and operating networks * 5+ Years Checkpoint Security * 5+ Years Cisco networking * 10+ Years in IT, * Bachelor's degree in Information Technology, Information Security, or equivalent 4 years additional experience in network security engineering. * Cisco Certified Network Associate (CCNA) * Azure Network Engineer Associate preferred * This position does require a US Citizen who can obtain Tier 3/ Level II IT Security Clearance (previously referred to as ADP II Clearance) after being offered a position and maintaining clearance after starting with International SOS. Required Languages * English * Any second language preferred. ## Description * Maintains data network hardware and systems including Azure and Cisco on-premise networks. * Investigates and resolves network and hardware issues of significance; researches, analyses, isolates and resolves errors. * Assesses and evaluates current and future systems * Monitor the IPS system for network intrusions and respond to incidents * Ensure IPS system and signatures are kept up-to-date. * Design networks on-premises or in the Azure government cloud as described in the project requirements and in line with architectural principles. * Develop and monitor key network metrics for input into IT reviews/reporting and monitoring. * Implement VPN and firewall rule, web filtering changes. * Perform hardware and software upgrades of network infrastructure like Cisco switches, Checkpoint firewalls, F5 Load balancers. ## Related Videos - [How Cisco embraced a DevOps culture within its network engineering team](https://www.wearedevelopers.com/videos/99-how-cisco-embraced-a-devops-culture-within-its-network-engineering-team) - [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers) - [An Applied Introduction to eBPF with Go](https://www.wearedevelopers.com/videos/1075-an-applied-introduction-to-ebpf-with-go) - [Creating a routing app with Google Maps API from scratch](https://www.wearedevelopers.com/videos/831-creating-a-routing-app-with-google-maps-api-from-scratch) - [Your Infrastructure Is Not a Playground: AI Agents for Infra Done Right](https://www.wearedevelopers.com/videos/2084-your-infrastructure-is-not-a-playground-ai-agents-for-infra-done-right) - [Turning Container security up to 11 with Capabilities](https://www.wearedevelopers.com/videos/718-turning-container-security-up-to-11-with-capabilities) ## Related Articles - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated) - [9 Ways to Make Money Hacking](https://www.wearedevelopers.com/magazine/333-9-ways-to-make-money-hacking) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Best Paying Jobs in Technology](https://www.wearedevelopers.com/magazine/256-best-paying-jobs-in-technology) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [Software Engineer Salary London](https://www.wearedevelopers.com/magazine/252-software-engineer-salary-london)