> Markdown version of [/jobs/ext/3279721-network-security-engineer](https://www.wearedevelopers.com/jobs/ext/3279721-network-security-engineer). 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 Engineer - **Company:** RapidMinds LTD - **Location:** London, UK - **Experience:** Experienced - **Salary:** £33,400.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Active Directory, Microsoft Azure, Spanning Tree Protocols, Cisco PIX, Cisco Routers, CompTIA Security+, System Configuration, Network Congestion, Trunking, Network Security, Network Monitoring, Routing, Network Segmentation, Cisco Nexus Switches, Open Shortest Path First (OSPF), Virtual Local Area Networks, Software Vulnerability Management, Identity Services Engine, Network Access Control, Information Technology, SolarWinds (Software), Routing & Switching, Cisco Switches, Cisco, Qualys - **Published:** September 24, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=d357d53798a0730d ## About the Role A degree in Computer Science, Networking, Information Technology or a related subject. Equivalent experience will be considered. - Cisco CCNA, or equivalent demonstrable routing and switching knowledge. - Practical experience configuring enterprise switches and routers. - Working knowledge of firewall policy administration on at least one major vendor platform. - Understanding of OSPF, VLANs, STP, ACLs and network segmentation. - Experience with a network monitoring platform. - Experience working to SLAs in an incident and change management process. - Clear written English. You will be writing incident notes and change records that clients read. - Right to work in the UK, or eligibility for sponsorship. NICE TO HAVE - CompTIA Security plus, or a similar security certification. - Experience with Qualys or another vulnerability management tool. - Exposure to Microsoft Azure, Microsoft 365 or Active Directory. - Experience with Cisco ISE or another NAC platform. - Experience in a managed service or multi-client environment., * Master's (preferred), * Network engineering: 2 years (preferred) ## Description We are looking for a Network Security Engineer to join our technical team. You will own the day-to-day health of our network estate and the networks we support under service contracts. The role mixes hands-on engineering with incident response and change work. This is a hands-on position. You will be expected to configure kit, chase root causes and write things down properly. You will work with senior engineers and with client technical contacts. WHAT YOU WILL DO - Monitor network performance and availability using tools such as SolarWinds. Triage alerts and resolve incidents within agreed SLAs. - Investigate connectivity and performance faults. Diagnose latency, packet loss and interface errors. Complete root cause analysis and record clear findings. - Configure and support Cisco Catalyst and Nexus switching. Work with VLANs, trunking and spanning tree. - Make routing and access control changes on Cisco routers and switches. Apply device hardening and secure management standards. - Administer multi-vendor firewalls including Cisco ASA, Cisco FTD and Palo Alto. Manage policy, NAT, security zones and object groups. - Review network behaviour analytics alerts. Validate anomalies against baseline traffic and escalate confirmed threats with evidence. - Run vulnerability scans and produce reports using Qualys. Track remediation to closure and verify fixes by re-scan. - Support network access control operations, including Cisco ISE. - Raise, quality check and close incident and change tickets. Make sure risk, rollback and closure notes are complete and accurate. - Implement approved changes during maintenance windows. Carry out pre and post checks and update documentation. - Act as a technical point of contact for client teams. Give clear, timely updates.