> Markdown version of [/jobs/ext/3058902-network-security-administrator](https://www.wearedevelopers.com/jobs/ext/3058902-network-security-administrator). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Network Security Administrator - **Company:** First Achieve - **Location:** UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Proxy Servers, Application Firewall, Complex Networks, Cyber Security, Virtual Private Networks (VPN), Network Security, Routing, Security Information and Event Management, Computer Networking Systems, System Availability, Software Security, Fortinet, Routing & Switching, Firepower, Cisco - **Published:** September 25, 2026 - **Apply:** http://firstachieve.com/jobs/308747-Senior-Network-Security-Administrator/#apply ## About the Role * 5+ years of experience in Network Security, Network Engineering or Cybersecurity Infrastructure roles * Strong hands-on experience with enterprise firewall technologies such as Fortinet, Check Point, Cisco Firepower or Palo Alto * Solid Cisco networking background covering switching, routing and enterprise network administration * Experience with technologies such as WAF, VPN, SIEM, EDR, SASE, IPS, Proxy Servers, PAM or API Security * Experience working within large enterprise or mission-critical environments * Strong troubleshooting and analytical skills * Ability to contribute to both infrastructure design and technical implementation * CCNP certification or equivalent networking expertise would be highly desirableWhat's on offer: * Opportunity to work within one of Greece's most critical enterprise infrastructures * Exposure to large-scale networking and advanced cybersecurity technologies * A collaborative team of experienced engineers with a strong knowledge-sharing culture * Involvement in challenging infrastructure projects, migrations and new technology implementations ## Description On behalf of our client, a leading organization operating critical national technology infrastructure, we are looking for an experienced Senior Network Security Administrator to join their growing Infrastructure & Security team. This is an excellent opportunity to join a highly experienced engineering team responsible for securing and maintaining one of the country's most critical enterprise environments. The role combines hands-on engineering, infrastructure design, troubleshooting and the implementation of modern cybersecurity technologies across a large-scale network. What you'll be doing: * Administer and enhance enterprise network security infrastructure across a large-scale environment * Configure, manage and troubleshoot next-generation firewalls, web application firewalls and secure remote access technologies * Participate in infrastructure migrations, technology upgrades and the implementation of new security solutions * Design, implement and improve network security controls to ensure high availability, resilience and performance * Manage Cisco networking infrastructure, including switching and routing technologies * Work with enterprise security platforms including WAF, EDR, PAM, SASE, VPN, SIEM and email security solutions * Investigate and troubleshoot complex network and security issues while supporting business-critical services * Collaborate with senior engineers on architecture decisions, technology evaluations and continuous infrastructure improvements * Produce technical documentation and contribute to security best practices across the organization * Participate in a shared on-call rota (approximately one week per month) to support the availability of critical production infrastructureWhat we're looking for ## 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) - [WeAreDevelopers LIVE - Back to CODE100](https://www.wearedevelopers.com/videos/1909-wearedevelopers-live-back-to-code100) - [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) - [What makes Cybersecurity different for critical infrastructure?](https://www.wearedevelopers.com/videos/571-what-makes-cybersecurity-different-for-critical-infrastructure) - [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) - [A Technical Introduction to Bitcoin's 2nd Layer- The Lightning Network](https://www.wearedevelopers.com/videos/15-a-technical-introduction-to-bitcoin-s-2nd-layer-the-lightning-network) ## Related Articles - [9 Ways to Make Money Hacking](https://www.wearedevelopers.com/magazine/333-9-ways-to-make-money-hacking) - [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries) - [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers) - [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)