Senior Systems Engineer

Permanent – Full time – Salary: £50,000 – 60,000 doe-Location: Crawley

About AerFin

AerFin is breathing new life into aviation. We buy, sell, lease and repair aircraft, engines, and parts to maximise the value for their owners and provide a lower-cost supply of material to our airline, lessor and MRO customers. Through our deep technical expertise and high-performance culture, we deliver confidence-inspiring quality, safety and value to our customers. Our blend of industry expertise and experience – today’s insight and tomorrow’s foresight – gives us a unique perspective on our industry that is trusted by over 600 customers across six continents. With regional hubs in Europe, Asia and the USA we’re perfectly placed to keep fleets flying and get deals done. That’s the AerFin way. That’s the way ahead.

About the role

We are seeking a highly skilled Senior Systems Engineer with genuine, hands-on experience in virtualisation, advanced networking, Microsoft security technologies, multi-site infrastructure, and enterprise application platforms. This role requires a real technical practitioner—someone who can design, deliver, and support complex systems with confidence, depth, and accuracy.

You will work closely with the Head of IT Infrastructure to support and evolve a robust, secure and scalable technology environment across the organisation. Whilst also being an escalation point for members of the IT Team.

If you are a proactive, hands-on technical expert who thrives in complex enterprise environments, we’d like to hear from you.

What you\’ll do:

• Design and optimise enterprise virtualisation platforms, including replication, capacity planning, and performance tuning.
• Administer remote application/desktop delivery and maintain Windows & Linux servers.
• Manage enterprise backup, recovery, and disaster recovery readiness.
• Configure and secure network-attached storage and ensure high availability and resilience.
• Support enterprise switching, wireless, WAN, and SASE environments.
• Maintain secure network architecture and ensure compliance with security standards.
• Manage Microsoft E5 estate (Defender, DLP, Conditional Access, Azure AD).
• Enhance cloud/on-prem security posture, monitoring, and response processes.
• Support SQL Server, Oracle, MySQL, PowerBI, and ERP systems.
• Ensure application performance, integrations, and security.
• Work with Head of IT Infrastructure on strategy and standards.
• Act as senior escalation point and lead infrastructure projects.
• Produce technical documentation and architecture diagrams.

What We’re Looking For

• Hands-on experience with enterprise switching, wireless, WAN, and virtualisation platform (including clusters and multi-site replication)
• Strong knowledge of Windows Server, Linux/Unix, storage platforms, enterprise backup, and disaster recovery solutions.
• Experience with SASE or similar secure networking, identity management, Microsoft Defender, Conditional Access, and DLP policies.
• Familiarity with relational databases and enterprise application environments.
• Excellent troubleshooting and root-cause analysis across infrastructure and application layers.
• Clear communicator, strong documentation skills, proactive team player, organized.