Senior Systems Engineer

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 ServiceNow, automation, and generative AI. Our 24x7 Operations squads support the health and performance of Microsoft Modern Workplace environments, ensuring proactive management, preventative maintenance, and operational excellence.

As a Senior Systems Engineer, you will provide third-line expertise in Microsoft Endpoint Manager technologies, delivering proactive support, driving continual improvement, and acting as a technical escalation point. You will work across customer environments, supporting compliance, automation, and standardisation initiatives. This is a shift-based role within our 24x7 operational squad structure, suitable for a technically confident engineer with a passion for Modern Workplace services and a proactive, mentoring-led approach.

What You Will Do
Support, maintain, and implement Microsoft Endpoint Manager-based solutions.
Lead troubleshooting for complex Modern Desktop incidents, taking ownership of investigations and coordinating resolution.
Mentor and guide junior engineers in the squad, sharing expertise and reviewing escalations.
Deliver automation initiatives using PowerShell to improve repeatability and reduce manual effort.
Ensure compliance with ISO 27001, ISO 9001, and relevant security standards (e.g. CIS, CE+).
Create and maintain structured technical documentation, aligned to security and operational standards.
Package and deploy applications using Microsoft Intune and Configuration Manager (SCCM).
Participate in customer meetings when required, such as change advisory boards or technical reviews.
Contribute to knowledge sharing through ServiceNow KB articles and team documentation.
What You Will Have
Demonstrable experience supporting Microsoft Endpoint Manager (Intune, SCCM) in enterprise settings.
Strong understanding of Microsoft 365 and Entra ID (Azure AD), with ability to design and support workplace services.
Knowledge of Windows OS management, application deployment, and compliance policies.
Experience authoring infrastructure, support, and procedural documentation.
Strong mentoring capability and willingness to support the development of others.
Experience delivering automation using PowerShell.
Excellent communication and stakeholder engagement skills.
Familiarity with ITIL processes (Incident, Problem, Change).
Eligibility for UK Government Security Check (SC) clearance.
Desirable Skills and Experience
Microsoft 365 Certified: Endpoint Administrator Associate.
Microsoft 365 Certified: Administrator Expert.
Microsoft Certified: Azure Virtual Desktop Specialty.
Exposure to operating within shared services or multi-customer MSP environments.
Additional Information
This is a shift-based role forming part of a 24x7 operations squad. Candidates must be willing and able to work a 24x7 pattern including nights, weekends, and public holidays.

What We Do For You
Wellbeing focused – Our people are our greatest assets, and ensuring everyone feels their best self to come to work is integral

Annual Leave – 26 days of annual leave, plus public holidays and the ability to buy additional days
Employee Assistance Programme – Free advice, support, and confidential counselling available 24/7 through Care First
Personal Growth - Regardless of where you are at in your career, we’re committed to enabling your growth personally and professionally

Development Programmes – From Future Managers to Leadership Training, our development programmes help you get where you need to go
Performance Bonus – Our Group-wide bonus scheme enables you to reap the rewards of your success
Online Learning Platform: SkillsHub! - Learning at your fingertips, anytime from anywhere. You can access our online library with relevant content for your career growth. We also offer a range of external training opportunities including apprenticeship.
Financial wellbeing - We understand as well as your mental wellbeing, your financial wellbeing is really important

Pension Scheme – Our plan with Scottish Widows offers 5% matched contribution by the company
Income protection insurance – Providing you with support and assistance when you need it most
Recognition – Highlighting and rewarding the great work our people do

Performance & Talent – Our own technology platform that allows you to get real-time feedback, conversations and goals to help you become your best self
Making a Difference – we provide opportunities to help our people make a difference to the causes they care about

MatchIt! – Fundraise for a cause close to your heart and OneAdvanced will match part of the funding
Volunteering Time – Our volunteering leave scheme allows you to use your time to help those who need it
Pennies from Heaven – donate the pennies from your pay check to help make a difference without lifting a finger
Who We Are
OneAdvanced is one of the UK's largest providers of business software and services serving 20,000+ global customers with an annual turnover of £330M+. We manage 1.5 million 111 calls per month, support over 2 million Further Education learners across the UK, handle over 10 million wills, and so much more. Our mission is to power the world of work and, as you can see, our software underpins some of the UK's most critical sectors.

We invest in our brilliant people. They are at the heart of our success as we strive to be a diverse, inclusive and engaging place to work that not only powers the world of work, but empowers the growth, ambitions and talent of our people.