Senior Infrastructure Engineer in London

Behind every moment of support we give someone living with dementia, there's infrastructure that has to work. What does it take to keep a charity like ours running? What sits behind every support call answered, every research database accessed, every fundraising campaign delivered? Infrastructure. And the people who build, protect and evolve it.

As a Senior Infrastructure Engineer, you'll play a central role in shaping, operating and maintaining our predominantly Microsoft cloud environment — keeping it strong, secure and ready for what comes next. Reporting to the Infrastructure Services Manager, you'll support, maintain and enhance our enterprise infrastructure across Azure cloud, Microsoft 365, identity, endpoint, network and core platform services.

You'll lead on complex incidents, drive root‑cause analysis, and bring the kind of calm, expert thinking that keeps services running and colleagues confident. This is a hands‑on, cloud‑first role with real scope to influence how we design, govern and optimise cloud services and our infrastructure for the long term. This role would particularly suit someone who has moved beyond traditional, on‑prem infrastructure into operational Azure and Microsoft 365 engineering and is confident owning cloud platforms end to end. This is a 12 month fixed term contract.

You're an experienced infrastructure professional who brings both depth of technical knowledge and the mindset of a trusted colleague. You understand that the work you do has real consequences for real people, and that motivates you to get things right. You're equally comfortable diving into a complex incident at pace and stepping back to think about how we build more resilient, secure and cost‑effective cloud services over time.

You take security seriously, communicate with clarity across technical and non‑technical audiences, and you thrive in environments where collaboration and accountability go hand in hand. You're someone who keeps learning, shares what you know, and makes the team around you better.

You'll have:

• Proven, demonstrable experience in Microsoft cloud technologies, including in depth hands‑on Azure experience (cloud platforms, virtual compute, storage, networking and the governance principles that keep it all accountable).
• Experience administering and optimising Microsoft 365 services, including identity, security and collaboration tooling.
• A grounding in enterprise infrastructure — servers, directory services, hybrid identity — and the hands‑on experience to back it up.
• Experience managing and supporting Disaster Recovery services to address continuity of vital business functions.
• A security‑first mindset, with practical knowledge of MFA, conditional access, privileged access management and vulnerability remediation.
• Proven networking foundations across WAN, VPN, firewalling and secure remote access.
• The discipline to work within ITSM frameworks and the rigour to maintain accurate configuration and asset data.
• Experience working alongside a Managed Service Provider as part of an augmented team, including managing service quality and accountability.
• A track record of producing documentation that works for diverse audiences — runbooks, procedures, service improvement write‑ups.
• Genuine curiosity about the infrastructure landscape and a commitment to staying sharp as it evolves.

What you'll focus on:

• Owning, evolving and maintaining our hybrid (predominantly Microsoft cloud platform) infrastructure — secure, stable and performing, day in, day out, and under pressure when it counts.
• Owning complex incidents from first response through to root‑cause analysis and lasting fixes.
• Working shoulder‑to‑shoulder with our Security team to embed good practice across everything we build and run.
• Helping us get more from what we have — through cost optimisation, service rationalisation and smarter configuration.
• Being a dependable partner to suppliers and managed service providers, holding them to the standard our users deserve.
• Championing modern identity protection across the organisation.
• Bringing energy and expertise to a team that genuinely wants to do good work together.

Our commitment to Equity, Diversity, Inclusion & Belonging ensures that the voices around our table better reflect and understand the communities we exist to serve. We strongly encourage individuals to apply who have a disability, impairment or health condition or individuals who identify as Black, Asian or from another minority ethnic background, as these groups are currently under‑represented at Alzheimer's Society. We want everyone we work with, as a colleague, volunteer, supporter, or someone we support, to feel included and that they belong at Alzheimer's Society.