System Engineer - Infrastructure

We are seeking a skilled and proactive IT System Engineer to join our London-based infrastructure team. The successful candidate will be responsible for the delivery of patch management services and the hands-on installation of updates, upgrades, patches, and hotfixes across enterprise environments. This role is both customer-facing and internally focused, requiring work at our London office, remote support, and on-site visits to Network Rail & TfL customer locations across Greater London and surrounding areas. The position requires strong technical capability, excellent documentation skills, and a professional approach when operating within client environments., Patch & Update Management

• Plan, test, schedule and deploy patches, updates, service packs, upgrades, and hotfixes.

• Manage structured patch cycles (monthly, emergency, zero-day response).

• Perform pre-deployment testing and post-implementation testing & validation.

• Maintain patch compliance reporting and remediation tracking.

• Ensure minimal disruption to production systems. OS Infrastructure

• Updates to various Linux distributions, Ubuntu, Debian, Red Hat etc.

• Updates to Windows Server (2016/2019/2022) & Windows 10/11 environments.

• Configure and administer WSUS. Network & Security Infrastructure

• Deploy firmware updates and patches for:

• Cisco routers and switches

• Cisco firewalls

• Juniper firewalls

• Perform configuration backups and validation before changes.

• Assist with vulnerability remediation and security audits. Virtualisation

• Manage patching and lifecycle updates for VMware environments.

• Maintain and upgrade VMware ESXi hosts and vCenter.

• Ensure VM availability during maintenance cycles. Customer Engagement

• Deliver on-site patching and maintenance at customer locations.

• Provide clear communication before, during, and after maintenance windows.

• Produce change documentation and implementation reports.

• Work within ITIL change control processes.

Essential

• 5+ years' experience in infrastructure or systems engineering roles.

• Experience delivering structured patch management processes.

• Knowledge of change management and maintenance windows.

• Excellent troubleshooting and root-cause analysis skills.

• Strong hands-on experience with some, or all of the following:

• Windows Server & Windows Workstation environments

• Linux Operating Systems

• WSUS administration

• Cisco rout ers & switches

• Cisco and Juniper firewalls

• VMware vSphere ( ESXi, vCenter, vLCM)

• HPE & Dell server firmware Desirable

• Familiarity with backup solutions.

• Exposure to automation (PowerShell scripting).

• ITIL Foundation certification.

• Vendor certifications (Microsoft, Cisco, VMware, Juniper).

• Experience working within Network Rail or Transport for London industry sectors., Professional and customer focused.

• Highly organised with strong documentation skills.

• Comfortable working out-of-hours during maintenance windows.

• Strong communication skills (written and verbal).

Hybrid working model (London office, remote, and customer sites).

• Occasional evening or night work during planned maintenance windows.
• Travel within Greater London and surrounding areas.

What We Offer

• Competitive London-based salary.
• Company pension scheme.
• 26 days Holiday plus Bank Holidays
• Employee portal
• Professional development and certification support.
• Exposure to diverse enterprise customer environments.
• Opportunity to work across multi-vendor infrastructure technologies.