Job Description: Third Line Support Engineer (Senior Infrastructure and Support Specialist)Job Title: Third Line Support EngineerDepartment: ITReporting To: Head of IT Infrastructure / IT ManagerLocation: Banbury (Office-based)Job Type: Permanent, Full-timeSalary: Competitive + benefits (DOE)Main Job Purpose We are seeking an experienced Third Line Support Engineer to provide advanced technical support, own complex infrastructure issues, and ensure the high availability, security, and performance of critical IT systems. This senior hands-on role focuses on resolving escalated incidents, maintaining and optimising virtualised and containerised environments (VMware, Kubernetes), supporting core business databases (Progress OpenEdge SQL), and contributing to infrastructure projects and continuous improvement.You will act as the escalation point for the IT Service Desk, drive root-cause analysis, implement proactive fixes, and support business-critical systems with minimal downtime.Key ResponsibilitiesAdvanced Technical Support and Incident ResolutionOwn and resolve complex, escalated incidents and problems from Level 1/2 support, ensuring rapid diagnosis and permanent fixes.Provide deep technical troubleshooting across servers, networks, cloud platforms, virtualisation (VMware), container orchestration (Kubernetes), and Progress OpenEdge databases.Perform root-cause analysis on recurring or high-impact issues and implement preventive measures.Maintain high availability of critic