Senior Network Security Engineer

Salary: £70,000 - 70,000 per year Requirements: • A good background in Network Security within a large scale, complex organisation • Experience setting up, maintaining, and upgrading firewalls • In-depth experience of at least one of the following: Fortinet, Cisco ASA/Firepower, Check Point, or Palo Alto • Experience within a large scale, complex organisation; managed service, consultancy, or B2B experience would be highly beneficial • Recent experience dealing with major incidents involving networks and firewalls • Industry certifications may be required for top-end salaries, such as Fortinet NSE 4/5/6/7, Check Point CCSA/CCSE, Palo Alto PCNSA/PCNSE, or Cisco CCNA/CCNP • Eligibility to obtain SC clearance Responsibilities: • Join our existing Network Security team and work alongside our SOC • Set up, maintain, patch, and upgrade customer firewalls • Actively work on client firewalls • Complete firewall upgrades • Run IPS and IDS • Perform log reviews • Carry out general BAU tasks such as VPN creation • Support a variety of clients by helping to set up, maintain, monitor, and secure their networks • Deal appropriately with major incidents • Ensure appropriate steps are in place and followed for vulnerability remediation • Perform safe upgrades and patches where required • Provide accurate and informed security insights internally and to our customers • Ensure incident response levels are appropriate Technologies: • Cisco • Firewall • Support • Network • Security • VPN More: We are a renowned organisation experiencing continued growth, and we are looking for talented Network Security Engineers to join us in a managed service environment in Sheffield City Centre. This is a hybrid role offering the opportunity to progress your network security career, with a competitive salary of £50,000 to £70,000, a 10% on-target bonus that can rise to 15% based on performance, study leave and paid network security certifications, internal progression opportunities, 25 days annual leave plus bank holidays, a generous pension scheme, flexible working arrangements, and other company-specific benefits. last updated 38 week of 2026