Infrastructure Technician

Sumer; Greater London; On-site; GBP 65,000 - 90,000; Full time

Job summary

Sumer is seeking an experienced IT Infrastructure Analyst to support a major transformation programme in London, consolidating multiple accountancy firms into a centralised Microsoft Azure environment.

You will migrate on‑premises and existing cloud estates to a unified, secure Azure platform, manage Nutanix, Windows Server and Citrix, and coordinate identity, networking and governance across internal teams and vendors.

Qualifications

• Experience with Microsoft Azure and hybrid/cloud migrations.
• Proven track record delivering infrastructure migration projects (VMware/Hyper-V) to Azure or similar.
• Strong understanding of networking, security, and governance in enterprise IT environments.
• Experience with Microsoft 365 tenant migrations and identity management.

Responsibilities

• Manage and maintain Nutanix, Windows Server, Citrix and wider infrastructure, ensuring performance, capacity, availability and security.
• Administer Microsoft 365, Entra ID, Active Directory and key business applications.
• Manage and troubleshoot network infrastructure, including LAN, WAN, WLAN and routing.
• Plan and deliver infrastructure upgrades, migrations and modernisation, including migration of servers, virtual machines, storage, file services and applications to Azure.
• Support tenant consolidation, identity integration and hybrid/cloud transformation across multiple entities.
• Assess and document existing on-premises, hybrid and cloud environments, developing appropriate migration strategies.
• Provide Level 3 technical support, troubleshoot complex infrastructure issues and maintain security, compliance and governance standards.
• Work with project stakeholders to manage migration projects, risks and documentation, providing technical handover and knowledge transfer to internal teams.

Skills

Microsoft Azure

Nutanix

Windows Server

Citrix

Microsoft 365

Entra ID

Active Directory

Azure Migrate

VMware

Hyper-V

Networking (LAN/WAN)

Security & governance

Tools

Nutanix

Windows Server

Citrix

Microsoft 365

Entra ID

Active Directory

Azure Migrate

VMware

Hyper-V

Job description

Description

We are seeking an experienced IT Infrastructure Analyst to support a major transformation programme, consolidating multiple accountancy firms into a centralised Microsoft Azure environment.

Department: Operations - IT

Location: London Cavendish Square

We are seeking an experienced IT Infrastructure Analyst to support a major transformation programme, consolidating multiple accountancy firms into a centralised Microsoft Azure environment.

This role will play a key part in migrating diverse legacy infrastructures (including on-premises and existing cloud estates) into a unified, secure, and scalable Azure platform. The contractor will work closely with internal IT teams, third-party vendors, and business stakeholders to ensure smooth and efficient transitions.

Key Responsibilities

• Manage and maintain Nutanix, Windows Server, Citrix and wider infrastructure, ensuring performance, capacity, availability and security.
• Administer Microsoft 365, Entra ID, Active Directory and key business applications.
• Manage and troubleshoot network infrastructure, including LAN, WAN, WLAN and routing.
• Plan and deliver infrastructure upgrades, migrations and modernisation, including migration of servers, virtual machines, storage, file services and applications to Azure.
• Support tenant consolidation, identity integration and hybrid/cloud transformation across multiple entities.
• Assess and document existing on-premises, hybrid and cloud environments, developing appropriate migration strategies.
• Provide Level 3 technical support, troubleshoot complex infrastructure issues and maintain security, compliance and governance standards.
• Work with project stakeholders to manage migration projects, risks and documentation, providing technical handover and knowledge transfer to internal teams.

Skills, Knowledge & Expertise

• Strong hands-on experience with Microsoft Azure, including Virtual Machines, Networking, Storage, Azure Migrate and Entra ID.
• Proven experience delivering infrastructure migration and transformation projects, including migrations from VMware/Hyper-V and existing cloud platforms such as Azure and AWS.
• Strong understanding of networking, VPNs, firewalls, routing, cloud security, backup and disaster recovery.
• Experience with Microsoft 365 tenant migrations, identity management and hybrid environments.
• Strong troubleshooting and problem-solving skills, with the ability to resolve complex infrastructure issues.
• Good understanding of security, resilience, availability and governance within enterprise IT environments.

Desirable Experience

• Experience within professional services or accountancy firms
• Familiarity with accountancy platforms such as: CCH, IRIS, Caseware, Sage 50 accountancy and payroll
• Linux experience
• Veeam
• Powershell (including Powershell for Exchange)
• Experience working in professional services, financial services or accountancy firms

Belong @ Sumer

At Sumer, we know everyone’s journey is different. That’s why we’re committed to fairness, removing barriers and giving people the support they need to do their best work. If you need any support during the hiring process, just let us know.

Our values represent what matters most to us and guide how we work every day:

• We Shine Together
• We Do the Right Thing
• We Make It Count

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