Senior Infrastructure Administrator

At Assystem, our mission is to accelerate the energy transition worldwide. Our 7,500 Switchers blend engineering excellence with digital innovation to transform the global energy landscape. In the UK, we’re driving low-carbon initiatives across nuclear and renewable energy, transmission networks, and future-forward digital infrastructure.

Why Join the Community of Switchers?

Be part of one of the top three largest nuclear engineering companies globally. As a Switcher, you’ll join missions that redefine how we power our world. Your future team will support vital digital infrastructure, delivering innovation and resilience to energy projects shaping the low-carbon future.

Job Description

The Job Mission

This role ensures the health and evolution of our IT infrastructure estate.

You’ll manage both cloud and locally hosted environments.

Your future team will support national infrastructure across key engineering programmes.

Manage endpoints, servers, mobile devices, and storage infrastructure

Administer Azure environments, including provisioning and storage configurations

Support Microsoft 365 tenant setup, licensing and administration

Deploy virtual machines and configure hypervisors across environments

Troubleshoot Office 365 and mobile device technical issues

Assist with cloud-based collaboration tools (PowerBI, GitHub, Azure DevOps)

Maintain documentation for procedures, changes, and system states

Monitor system performance and enforce IT compliance standards

My profile

5+ years’ experience in infrastructure or system administration

Hands-on experience with Azure and M365 environments

Able to manage and deploy endpoints, VMs, and cloud services

Skilled in Microsoft Office and mobile device support

Strong troubleshooting and infrastructure performance monitoring abilities

Experience with VM hypervisors and cloud-based provisioning

Knowledge of collaboration platforms like PowerBI and GitHub

Ability to document procedures and maintain IT compliance

Microsoft “Fundamentals” and Azure, Power Platform, or Data accreditations

Knowledge of VMware systems and templates

Familiarity with SolarWinds or similar IT tools

Understanding of Azure DevOps environments

ITIL Certification or equivalent process framework

Why You Should Apply

Be part of Assystem’s digital transformation, enabling secure and scalable systems that support critical UK energy missions. Your work will have real impact across low-carbon infrastructure projects shaping a sustainable future.

Benefits include :

Hybrid Working Opportunity

Pension scheme (8% company contribution / 4% personal contribution)

25 days’ paid annual leave + bank holidays + option to buy or sell days

Professional fees reimbursed

Flexible working hours

Employee referral scheme

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

Are you a prospective or recent graduate?

Assystem offers you the opportunity to join our Switch to Grow UK Graduate Scheme, where you’ll gain hands on experience in engineering, digital services, and project management by working on some of the world’s most critical energy projects.

Be part of the challenge of the century; accelerating the switch to low carbon energy!

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