Keystone Group
Infrastructure Engineer
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About The Role
We're looking for an Infrastructure Engineer to help us manage, secure, and modernise our on-premise and cloud infrastructure. You'll work across a hybrid estate — supporting existing on-premise systems while playing an active role in our ongoing migration to modern cloud and hybrid platforms, and in the day-to-day administration of Microsoft Entra ID. This is a hands-on engineering role with genuine scope to shape how infrastructure is built and secured across the group.
What You’ll Be Doing
On-Premise Infrastructure
- Administer and maintain our server estate (physical and virtualised), including patching, capacity management, and lifecycle planning
- Support and help decommission legacy/EOL systems (servers, SQL Server instances, and applications) as part of the group's estate rationalisation programme
- Manage Active Directory across multiple domains, supporting ongoing consolidation and identity modernisation work
- Administer core infrastructure services: DNS, DHCP, file/print, backup and disaster recovery, VOIP Telephony
- Support the group's migration from VMware vSphere7 to vSphere8/9 or to Hyper-V/Azure, including build, testing, and cutover activity
Entra ID & Cloud Identity Administration
- Own day-to-day administration of Microsoft Entra ID: user and group lifecycle, licensing, app registrations, and enterprise applications
- Support Entra ID tenant consolidation across all group brands, including domain and UPN/primary SMTP alignment
- Configure and maintain Conditional Access policies, MFA enforcement, and password policy in line with NCSC guidance
- Administer Privileged Identity Management (PIM) and just-in-time (JIT) access for privileged roles
- Support hybrid identity sync (AD to Entra ID) and troubleshoot synchronisation issues
Cloud & Security
- Support Microsoft 365 administration alongside Entra ID (Exchange Online, SharePoint, Teams)
- Assist with Azure infrastructure (App Services, Functions, storage, networking) supporting group applications and data platforms
- Contribute to the group's Cyber Essentials Plus programme, including remediation of findings and ongoing control maintenance
- Operate and tune endpoint and network security tooling (e.g. Microsoft Defender, Sophos, ThreatLocker, Ivanti Patch Management, SIEM alerting)
- Support security patching, vulnerability remediation, and hardening across both on-premise and cloud infrastructure
- Participate in incident response and root-cause investigation for infrastructure and security incidents
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General
- Produce and maintain clear documentation for infrastructure, configurations, and standard operating procedures
- Work within change management (CAB) processes for planned infrastructure changes
- Provide 2nd/3rd-line escalation support and mentor junior team members where required
- Collaborate with the wider IT team on projects spanning infrastructure, security, and identity
You will also demonstrate:
- Strong problem-solving skills, with a structured and analytical approach to diagnosing and resolving issues.
- A proactive mindset, with the confidence to identify improvements, challenge existing ways of working and drive solutions through to completion.
- A strong security mindset and understanding of the importance of maintaining secure, resilient and well-managed infrastructure.
- Excellent communication skills, with the ability to explain technical issues and solutions clearly to both technical and non-technical stakeholders.
- The ability to work effectively in a changing environment, managing multiple priorities while maintaining a high standard of delivery.
- A collaborative approach, with a willingness to share knowledge, support colleagues and contribute to the wider IT team and Group objectives.
What We’re Looking For
- Educated to Degree Level with a Minimum 5 years of experience working in a similar capacity as an Infrastructure Engineer or have a minimum of 10 years’ experience working in an IT Infrastructure role
- Proven experience administering Windows Server environments and Active Directory at scale
- Hands-on experience administering Microsoft Entra ID (Azure AD) — users, groups, Conditional Access, and app registrations
- Hands-on experience with virtualisation platforms (VMware and/or Hyper-V)
- Practical understanding of core networking (DNS, DHCP, VLANs, firewalls)
- Some exposure to Azure or another public cloud platform (IaaS/PaaS fundamentals)
- Working knowledge of endpoint security, patch management, and vulnerability remediation
- Strong troubleshooting skills and a methodical approach to problem-solving
- Clear communicator, comfortable working with both technical peers and non-technical stakeholders
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What We Offer
- Opportunities for professional development and career progression
- A supportive, values-driven and inclusive working environment
- Competitive salary and benefits package
- 32 days annual leave, increasing with service
- Pension
- Life Assurance
- Healthcare Cashback Plan
- Enhanced Family Friendly policies
- Additional employee benefits including access to our Cycle to Work Scheme, Employee Discount Scheme, Employee Recognition awards, Employee Assistance Programme.
A Bit About Us
For more than three decades, the Keystone Group has grown to become one of the UK and Ireland’s largest family-owned construction product manufacturers. Driven by a relentless focus on innovation and customer excellence, the Group employs over 2,000 employees across 28 sites, supplying cutting-edge building solutions to growing markets in the UK & Ireland, Europe, Australia and North America. Its portfolio includes market-leading brands in the steel, light & environmental and timber sectors.
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