Senior IT Support Engineer (3rd Line Support)Northampton (Hybrid)Monday - Friday, full time permanent Up to £42,000 DOE We are seeking an experienced Senior IT Support Engineer with proven 3rd Line Support expertise to join our client''s growing IT team. The successful candidate will be responsible for resolving complex technical issues, maintaining and improving IT infrastructure, supporting business-critical systems, and leading IT projects from initial planning through to successful implementation and handover. This role requires strong troubleshooting skills across desktop, server, network, cloud, and security technologies, alongside in-depth knowledge of firewalls and network security. You will play a key role in delivering infrastructure projects, mentoring junior engineers, and driving continuous improvement across the IT estate.Key Responsibilities:Provide 2nd and 3rd Line technical support for users across multiple sites.Investigate, troubleshoot, and resolve complex hardware, software, server, network, and infrastructure issues.Act as the primary technical escalation point for the Service Desk team.Administer and support Microsoft 365 services, Azure AD/Entra ID, Windows Server, Active Directory, DNS, DHCP, and Group Policy.Configure, maintain, and troubleshoot networking infrastructure including switches, routers, wireless solutions, VPNs, and enterprise firewalls.Take ownership of firewall administration, including security policies, NAT, VPN configuration, rule ..... full job details .....