Duty Engineer - Senior Infrastructure Operations Engineer (24/7 Secure Systems)
Location: On-site, Northallerton, North Yorkshire
Department: Engineering
Section: Engineering
Reports To: Technical Director
Location: Secure UK Defence Environment
Contract Type: Permanent
Client: Our client is a specialist provider of secure ICT services supporting critical UK Defence systems. Operating within highly regulated, high-availability environments, they deliver resilient infrastructure, operational assurance, and rapid incident response across mission-critical platforms.
The engineering teams work at the forefront of secure networking, virtualisation, automation, and monitoring technologies to ensure Defence systems remain available, compliant, and secure 24/7.
Purpose of the Role: The Duty Engineer is a senior technical professional operating within secure Defence ICT environments, providing 24/7 operational support for mission-critical systems.
The role ensures system availability, resilience, security, and rapid incident resolution in line with contractual SLAs and KPIs, combining deep infrastructure expertise with modern automation and monitoring practices to deliver stable and compliant services.
You combine deep infrastructure expertise with modern automation and monitoring practices, enabling stable, efficient, and compliant service delivery within high-assurance environments.
The role operates as part of a structured 24/7 duty rota, requiring out-of-hours, on-call, and incident response support to maintain continuous operational service.
Key Responsibilities:
The successful candidate will be responsible for:
Providing 24/7 operational duty support to ensure the availability, security, and performance of Defence ICT systems
Acting as a technical first responder for incidents, alerts, and service degradation within secure environments
Troubleshooting and maintaining LAN, WAN, MPLS, SD-WAN networks, firewalls, and VPN services
Administering Active Directory and domain services, including DNS, PKI, RDS, WSUS, and related platforms
Managing VMware virtualisation environments, including ESXi, vCenter, and VMware Cloud Foundation
Operating and supporting ASTERIX VoIP systems
Maintaining SIEM and monitoring platforms, including Splunk and Microsoft System Centre tooling
Performing Linux system administration, patching, and security hardening
Creating and maintaining automation using PowerShell, Ansible, and GitLab
Supporting vulnerability remediation, compliance activities, and audit readiness
Delivering incident response, root-cause analysis, and service restoration in line with agreed SLAs and KPIs
Coordinating technical response and escalation to prevent incident impact or recurrence
Experience, Skills & Qualifications:
Essential / Highly Desirable:
CCNA (or equivalent experience)
LAN, MAN, and campus networking
BGP, MPLS, VPLS, and VPN technologies
Software-Defined Networking (VMware NSX) and SD-WAN
Security systems administration, including IDS/IPS
Active Directory, ADFS, PKI, DNS, DHCP, GPO, RDS, WSUS, WAP
VMware vSphere, ESXi, and VMware Cloud Foundation administration
ASTERIX VoIP systems
SIEM & monitoring: Microsoft System Centre Suite, Splunk Enterprise / ES / ITSI
Telemetry platforms: OpenTelemetry, Telegraf
Linux administration and security patching
Automation and scripting using PowerShell, Ansible, and GitLab
Application Process:
To apply, please submit your CV detailing your relevant experience and qualifications for the role. Applications will be reviewed on a rolling basis, so early submissions are encouraged.
Equal Opportunity Employer:
We value diversity and are committed to creating an inclusive work environment. We encourage applicants from all backgrounds to apply.
Contact:
Duty Engineer - Senior Infrastructure Operations Engineer (24/7 Secure Systems) • Northallerton, United Kingdom
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