Salary: £39,000 - 72,500 per year Requirements: Active DV Clearance (essential) Strong expertise in Cisco networking technologies (routing, switching, firewalls) Proven experience with F5 (LTM, GTM, ASM desirable) Solid understanding of cryptographic technologies and secure communications Extensive experience producing Low-Level Designs (LLD) for production environments Demonstrable experience working in highly secure or classified environments Strong troubleshooting and problem-solving capability across complex networks Responsibilities: Lead the design, implementation, and support of secure network solutions Produce low-level designs (LLD) to a production-ready standard Act as the technical authority across network infrastructure and security domains Own and drive complex delivery workstreams within secure programmes Provide mentoring and technical leadership to engineering teams Ensure all solutions meet stringent security and compliance requirements Technologies: Cisco Support Network Security More: We are seeking an experienced Lead Network Engineer to join our high-performing team delivering critical infrastructure solutions within a secure environment. This is a senior, hands-on role suited to an individual with deep technical expertise and strong leadership capability. We offer a dynamic work environment where your skills can make a significant impact. last updated 18 week of 2026