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Senior Support Engineer - L3 @ Trinity Managed Services

GBOnsiteFull-time
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About this role

Salary: £34,000 - 38,000 per year

Requirements

  • Proven experience in technical support or a service desk role within an MSP or similar IT environment, ideally at third-line level
  • Strong troubleshooting skills across core IT infrastructure, including Windows Server, Active Directory, Microsoft 365, networking, and endpoint management
  • Track record of independently resolving complex, escalated technical issues
  • Confident communication skills, including the ability to explain technical details clearly to colleagues and clients
  • Experience writing clear, well-structured technical documentation
  • Patient, approachable coaching style and confidence training and upskilling others
  • Strong prioritisation and time-management skills, with the ability to balance hands-on problem-solving, documentation, and training
  • Calm under pressure, particularly when handling urgent or high-impact issues
  • Collaborative approach, working closely with our Service Desk Manager and wider team
  • Proactive in identifying technical problems and knowledge gaps before they become recurring issues
  • Commitment to raising standards across our team

Responsibilities

  • Act as the primary escalation point for high-level technical issues and service requests raised by our service desk team
  • Own escalated tickets through to resolution, keeping stakeholders and clients updated throughout
  • Investigate and resolve complex technical problems beyond first- and second-line capability
  • Work with our Service Desk Manager on priority calls when escalations put SLAs at risk
  • Create and maintain clear, accurate knowledge base articles in Hudu covering fixes, processes, and recurring issues
  • Review and update existing knowledge base articles as systems and processes change
  • Promote consistent use of Hudu across our team and encourage colleagues to document solutions
  • Train and mentor Technical Support Engineers, sharing technical knowledge and troubleshooting approaches
  • Identify individual and team-wide technical knowledge gaps
  • Work with our Service Desk Manager to agree and deliver plans to address identified knowledge gaps

Technologies

  • Active Directory
  • Support
  • Microsoft 365
  • Windows
  • Office 365

More

Were hiring a Senior Support Engineer to join our Service Desk team in Great Chesterford, United Kingdom. The role reports to our Service Desk Manager and builds on day-to-day technical support work, with additional ownership of complex, high-impact issues and a focus on developing our teams technical capability. This is a full-time, permanent, in-person role, with 37.5 hours per week on variable shifts between 8:00am and 8:00pm, Monday to Friday; well communicate working hours at least one week in advance. Optional weekend on-call work is available, with additional payment under our on-call arrangements. The salary is £34,000–£38,000 per year, depending on experience, with a discretionary performance-related bonus. Benefits include additional leave, casual dress, company events, free and on-site parking, profit sharing, a referral programme, sick pay, and work-from-home availability.

last updated 46 week of 2026

Skills

Active DirectoryMicrosoft 365Windows ServerNetworkingendpoint managementTroubleshootingTechnical DocumentationCoaching

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