Senior Systems Engineer

Join One Advanced

Our IT Managed Services business enables customers to innovate, transform, and seize new opportunities. The Technical Operations function underpins this mission by delivering enterprise‑grade, 24x7x365 technical support to mid‑market clients across both public and private sectors.

We operate a shared services model aligned with ITIL v4, underpinned by Service Now, automation, and generative and agentic AI. Our 24x7 Operations squads are responsible for maintaining the stability, security, and continuous improvement of customer environments across cloud, infrastructure, and modern workplace services.

As a Systems Engineer (Modern Workplace), you will specialise in Microsoft 365 and endpoint management services.

You will support live service operations across multiple customer environments, ensuring that collaboration platforms, identity services, and end‑user technologies remain secure, stable, and well governed. You will contribute to incident resolution, proactive service management, and continuous improvement, while developing deeper technical capability across the Microsoft ecosystem and adjacent automation platforms.

What you will be doing

• Provide third‑line operational support across Microsoft 365 services, including Exchange Online, SharePoint Online, Teams, One Drive and Entra .
• Administer and support Microsoft Intune and endpoint management solutions, including device compliance, configuration profiles, and application deployment.
• Resolve incidents, fulfil service requests, and implement standard changes in line with defined runbooks and ITIL practices.
• Monitor service health, security posture, and platform alerts, taking proactive action to prevent incidents and improve stability.
• Support identity and access management activities, including conditional access, MFA, and role‑based access controls.
• Contribute to patching, policy enforcement, and configuration management across Modern Workplace services.
• Use Service Now effectively to manage work, maintain accurate records, and ensure Configuration Items are correctly updated within the CMDB.
• Participate fully in shift handovers, maintaining clear and structured communication of risks, actions, and service status.
• Identify repeat issues, inefficiencies, or gaps in documentation and take ownership of improvement opportunities.
• Contribute to the development and maintenance of knowledge articles, runbooks, and operational standards.
• Support and adopt automation practices using Power Shell, Power Platform, or other tooling to reduce manual effort and improve consistency.
• Collaborate with engineers across infrastructure, network, and security domains to resolve cross‑platform issues.

• Strong working knowledge of Microsoft 365 administration in an operational environment.
• Experience supporting Intune / Endpoint Manager and Windows device management.
• Understanding of Entra  (Azure AD), identity controls, and access governance.
• Practical experience working within an ITIL‑aligned support model (Incident, Change, Problem).
• Strong troubleshooting capability, with a structured and methodical approach.
• Experience using ITSM tooling such as Service Now.
• Ability to manage workload effectively in a shared services, multi‑customer environment.
• Clear and concise communication skills, both written and verbal.
• A disciplined approach to documentation and knowledge sharing.
• Eligibility for UK Government Security Check (SC) clearance.

Desirable skills and experience

• Experience supporting Microsoft Teams telephony and collaboration services.
• Exposure to Power Platform (Power Automate, Power Apps) for operational improvement.
• Scripting or automation experience using Power Shell.
• Awareness of security frameworks and controls (e.g. conditional access, endpoint security baselines).
• Experience working in an MSP or shared service environment.
• Microsoft 365 Certified:
  Endpoint Administrator Associate.
• Microsoft 365 Certified:
  Administrator Expert.
• Microsoft Certified:
  Identity and Access Administrator Associate.

Please note, applicants must have the legal right to work in the UK at the time of application.

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