IT Infrastructure Engineer

Gardiner & Theobald LLP; Greater London; Hybrid; GBP 52,000 - 76,000; Full time

Job summary

Gardiner and Theobald LLP is seeking an IT Infrastructure Engineer to join the IT Infrastructure and Security team. This hands-on generalist role covers endpoint management, Microsoft 365, identity, networking and infrastructure support.

You will administer core infrastructure platforms and act as the first escalation point for the Service Desk. The role is based in our London office with 1 day a week working from home after the probation period.

Qualifications

• Proven experience in an infrastructure engineering or advanced 2nd/3rd line role.
• Strong Microsoft 365, Intune and Entra ID administration experience.
• Strong networking knowledge, including TCP/IP, DNS, DHCP, VLANs and VPNs, with the ability to troubleshoot complex connectivity issues.
• Experience with enterprise switching and firewall platforms.
• Practical PowerShell scripting experience.
• A structured troubleshooting approach and the ability to see issues through to resolution.
• A security-conscious approach to infrastructure administration.
• Excellent written and verbal communication skills.

Responsibilities

• Administering Microsoft 365, Intune and Entra ID, including Microsoft Teams and telephony.
• Managing patching and software deployment.
• Supporting Azure Virtual Desktop.
• Supporting network switching, wireless and firewall infrastructure.
• Diagnosing and resolving connectivity, performance and VPN issues.
• Carrying out routine network and firewall changes.
• Working closely with the Service Desk on escalated incidents, providing technical support and knowledge transfer.
• Triaging infrastructure alerts and incidents.
• Supporting Windows Server and Active Directory.
• Maintaining technical documentation and operational runbooks.

Skills

Microsoft 365

Intune

Entra ID

Networking

VPN

PowerShell

Windows Server

Active Directory

Tools

Azure Virtual Desktop

Firewall platforms

Enterprise switching

DNS/DHCP/VLANs

Job description

Why G&T

Gardiner and Theobald is an independent construction and property consultancy committed to providing world class service to our clients. Our dedicated team of over 1,300 people delivers Cost Management, Project Management and Specialist Consultancy services from a network of UK and US offices bound by a common purpose – to build a better tomorrow.

We define our success by the value we create for our clients, the fulfilling careers we build for our people and our contribution to the communities we work in. Our own long-term business performance aligns profit with purpose, taking social and environmental responsibility for our actions and the legacy we leave behind.

People are central to our mission. Rewarding individuals based on their unique abilities, talent and hard work, we believe in the quality of experiences and investing in a collaborative culture where all can thrive.

About the Role

We are recruiting an IT Infrastructure Engineer to join our IT Infrastructure and Security team.

This is a hands‑on generalist role covering endpoint management, Microsoft 365, identity, networking and infrastructure support. You will administer a range of core infrastructure platforms and act as the first IT infrastructure escalation point for the Service Desk.

Key Responsibilities:

• Administering Microsoft 365, Intune and Entra ID, including Microsoft Teams and telephony.
• Managing patching and software deployment.
• Supporting Azure Virtual Desktop.
• Supporting network switching, wireless and firewall infrastructure.
• Diagnosing and resolving connectivity, performance and VPN issues.
• Carrying out routine network and firewall changes.
• Working closely with the Service Desk on escalated incidents, providing technical support and knowledge transfer.
• Triaging infrastructure alerts and incidents.
• Supporting Windows Server and Active Directory.
• Maintaining technical documentation and operational runbooks.

Please note this role will operate on normal office hours (Monday – Friday, 9am - 5:30pm), and on call from home (evenings and weekends) 1 week in every 4.

This role is based in our London office with 1 day a week working from home after the probation period.

About You

Essential Experience:

• Proven experience in an infrastructure engineering or advanced 2nd / 3rd line role.
• Strong Microsoft 365, Intune and Entra ID administration experience.
• Strong networking knowledge, including TCP / IP, DNS, DHCP, VLANs and VPNs, with the ability to troubleshoot complex connectivity issues.
• Experience with enterprise switching and firewall platforms.
• Experience supporting Windows desktop and server environments across on-premises and cloud-hosted infrastructure.
• Practical PowerShell scripting experience.
• A structured troubleshooting approach and the ability to see issues through to resolution.
• A security-conscious approach to infrastructure administration.
• Excellent written and verbal communication skills.

Desirable Experience:

• Cisco CCNA and/or Fortinet NSE4 / FCP certification.
• VMware vSphere.
• Experience with enterprise security tooling and security best practices.

About Us

Forward thinking and future focused, we champion social mobility, ethical governance, equality and diversity, creating an inclusive environment where everyone’s unique talents and experiences are valued. Our ESG goals are at the forefront of our business plan, and we are proud to have created social value worth over £19m+ since 2021. Our initiatives include the G&T ESG Committee, dedicated to increasing opportunities and removing barriers for social mobility and equality within the firm, as well as our Next Gen programme which focuses on nurturing the next generation in the industry. Our commitment to realising a more sustainable future is witnessed not only through helping our clients meet their own next zero carbon aspirations but also by reaching our own, with an aim for our firm to be net zero by 2030.