IT Infrastructure & Security Engineer, IT Infrastructure & Security Engineer

Calisen; Greater Manchester; On-site; GBP 101,000 - 138,000; Full time

Job summary

Calisen Group seeks an experienced Infrastructure Migration Engineer on an outside IR35 contract to support a major Microsoft 365 and infrastructure migration programme. The role is office-based and requires five days on site.

You will execute migration activities with Quest tooling and Microsoft technologies, resolve blockers, contribute to security hardening and user cutovers, and work with Service Desk, Infrastructure, Cyber Security and Project teams to ensure a smooth transition.

Qualifications

• Experience administering Microsoft 365, Entra ID and Active Directory.
• Proven ability to support enterprise Microsoft 365 and endpoint environments.
• Experience with Quest migration tooling or similar enterprise migration platforms.

Responsibilities

• Deliver user, device and infrastructure migration activities using Quest tooling and Microsoft technologies.
• Support onsite migration waves, device migrations and user cutover activities.
• Identify and resolve migration blockers across Microsoft 365, Active Directory and endpoints.
• Carry out endpoint remediation and security hardening with Intune and Defender.
• Implement infrastructure changes to enable successful migrations.
• Coordinate with Service Desk, Infrastructure, Cyber Security and Project teams.
• Provide hands-on support to end users during migration activities.
• Produce technical documentation and migration procedures.

Skills

Microsoft 365

Active Directory

Entra ID

Intune

Windows 10/11 deployment

Azure administration

Tools

Quest migration tooling

Microsoft Defender

Group Policy

Job description

Join Us and Play a Key Role in a Business Critical Technology Transformation!

We're looking for an experienced Infrastructure Migration Engineer to join us on an outside IR35 contract basis and help deliver a major Microsoft 365 and infrastructure migration programme. This is an opportunity to make an immediate impact within a fast-paced environment, working at the heart of a significant technology transformation.

As part of this engagement, you'll use your expertise across Microsoft 365, Active Directory, Entra ID, Intune and endpoint technologies to support the migration of users, devices and services from a legacy environment into a modern, consolidated platform. You'll play a hands-on role in resolving technical challenges, improving security compliance and ensuring users can transition smoothly with minimal disruption.

This role is ideal for a contractor who enjoys delivering outcomes, solving complex technical issues and working directly with stakeholders to drive progress.

Key Information

• Contract Position
• Outside IR35 Engagement
• Office-based role requiring attendance 5 days per week
• Travel between company locations may be required
• Hands-on infrastructure, migration and security remediation work
• Immediate start preferred

What's in it for You?

• Opportunity to contribute to a high-profile transformation programme
• Outside IR35 engagement
• Varied and technically challenging work
• Exposure to modern Microsoft cloud and security technologies
• Opportunity to work with Infrastructure, Cyber Security and Project teams
• Autonomous role where your expertise will directly influence project success

What You'll Be Doing

• Delivering user, device and infrastructure migration activities using Quest migration tooling and Microsoft technologies.
• Supporting onsite migration waves, device migrations and user cutover activities.
• Identifying, troubleshooting and resolving migration blockers across Microsoft 365, Active Directory, endpoints and security controls.
• Carrying out endpoint remediation and security hardening activities using Microsoft Intune, Defender and related technologies.
• Implementing infrastructure changes and technical fixes to support successful migrations.
• Working closely with Service Desk, Infrastructure, Cyber Security and Project teams to coordinate migration activities and technical readiness.
• Providing hands‑on support to end users during migration activities.
• Producing technical documentation, migration procedures, knowledge articles and support handover material.

Essential Experience

What We're Looking For

• Strong experience in Microsoft 365, Entra ID and Active Directory administration.
• Experience using Quest migration tooling (or comparable enterprise migration platforms).
• Proven experience supporting enterprise Microsoft 365 and endpoint environments.
• Experience troubleshooting complex user, device and infrastructure issues.
• Experience carrying out endpoint remediation and security improvement activities.
• Strong knowledge of Windows 10/11 deployment, migration and support.
• Experience with Microsoft Intune, Defender and endpoint management technologies.
• Knowledge of Group Policy, Windows Server and Azure administration.

Desirable Experience

• PowerShell scripting and automation.
• Microsoft certifications such as Azure Administrator Associate or Endpoint Administrator Associate.
• Experience delivering outcomes within contract or project-based environments.
• Experience supporting large-scale migration programmes.

What Success Looks Like

You'll be someone who:

• Delivers results and thrives in a fast‑paced project environment.
• Takes ownership and works effectively with minimal supervision.
• Has excellent analytical and problem‑solving skills.
• Builds strong working relationships across technical and business teams.
• Communicates clearly with both technical and non‑technical stakeholders.
• Maintains a strong focus on security, quality and customer experience.

Location Requirement

Due to the hands‑on nature of the migration programme, including device remediation, user support and technical cutover activities, this role requires onsite attendance five days per week. The successful contractor will be expected to work from company offices and sites as required by the migration schedule.