System Engineer - Infrastructure

Posting date:	11 March 2026
Hours:	Full time
Closing date:	10 April 2026
Location:	London, London, E16 4TL
Company:	Telent
Job type:	Permanent
Job reference:	2109_1773250869

Summary

IT System Engineer - (Patch Management)
Location: London - E16, UK (Hybrid - Office, Customer Sites & Remote)
Employment Type: Full-Time
Reports To: Lead System Engineer
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Role Overview
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.
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Key Responsibilities
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.
Required Skills & Experience
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.
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Personal Attributes
- Professional and customer focused.
- Highly organised with strong documentation skills.
- Comfortable working out-of-hours during maintenance windows.
- Strong communication skills (written and verbal).
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Working Conditions
- 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.
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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.