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Randstad Logo Randstad · IT - Administration

Senior Infrastructure Technician

United Kingdom, Chelmsford · Job Posted June 29, 2026
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Job Description

Are you an experienced IT professional looking to do meaningful work? We are partnering with a vital, high-profile public sector organization to find a Senior Infrastructure Technician. In this critical role, you will be the backbone of the organization's digital operations, ensuring the high availability of mission-critical systems-including emergency operations and dispatch technology. You will act as the senior technical expert within the digital team, tackling complex problems and helping the organization run smoothly and securely.

Job Responsibility

  • Provide advanced 3rd line digital support to resolve complex issues across Windows server infrastructure, local area networks (LAN), wide area networks (WAN), and enterprise telephony systems
  • Serve as the primary technical escalation point and provide mentorship, support, and advice to 1st and 2nd-line service desk technicians
  • Perform routine daily management, health checks, and maintenance for all critical operational and business systems
  • Participate in a rotational on-call schedule to provide out-of-hours support for critical infrastructure and systems
  • Plan and deliver technical workstreams for ongoing digital projects, working closely with project managers and advising senior management on system resilience
  • Manage the IT asset register, handle hardware/software procurement, and liaise with third-party suppliers to ensure system optimization and contract renewals
  • Provide ad-hoc technical training to everyday users and help the organization maintain compliance with information governance standards

Requirements

  • Proven experience in a 3rd line support role with deep knowledge of Windows servers, networking (LAN/WAN), and telecommunications systems
  • Ability to independently diagnose and resolve complex system faults
  • A collaborative team player who can organize their own workload while guiding junior technicians and advising non-technical management
  • Experience or comfort working in a highly critical, fast-paced environment where system uptime is essential
  • Willingness to travel between bases as needed and step up during major organizational incidents
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