Senior ICT Infrastructure Engineer

Senior ICT Infrastructure Engineer About Reply:

Reply specialises in designing and implementing solutions based on new communication channels and digital media. Structured as a network of highly specialised companies, Reply supports leading European industrial groups in sectors such as Telco & Media, Industry and Services, Banking and Insurance, and Public Administration, helping define and develop business models enabled by new paradigms such as AI, Cloud Computing, Digital Media, and the Internet of Things.

Reply’s services include Consulting, System Integration, and Digital Services.

Role Overview :

The Senior ICT Infrastructure Engineer is a hands-on, technically authoritative role at the heart of Reply’s UK internal infrastructure, responsible for the engineering, architecture, and governance of core endpoint, identity, and Microsoft 365 platforms, including the end-to-end build and administration of a new tenant. Operating across 1st, 2nd, and 3rd line support, the post-holder combines day-to-day user support and desk-side work with expert-level incident resolution, security-focused configuration, and platform optimisation in a government and defence context.

They will own and enhance key services such as Intune, Entra , Purview, Conditional Access and endpoint security, while leading improvement initiatives, driving compliance with frameworks such as ISO 27001 and Cyber Essentials, and acting as a senior technical reference point and mentor within the ICT team.

Responsibilities:
Own the engineering, architecture, and governance of core UK ICT platforms, including Microsoft 365, Intune, Entra , Purview, Conditional Access, and endpoint security tooling.  Provide highly hands-on 1st, 2nd, and 3rd line support, from routine user requests and laptop builds through to expert-level troubleshooting and complex incident resolution.  Lead the end-to-end provisioning, configuration, and ongoing administration of a new Microsoft 365 tenant, ensuring robust security baselines, Zero Trust principles, and appropriate controls for government and defence contexts.  

Design, implement, and maintain automation and infrastructure-as-code solutions (e.g. Power Shell, Microsoft Graph API, Terraform) to improve consistency, efficiency, and compliance.  Ensure alignment with key security and compliance frameworks (including ISO 27001, GDPR, Cyber Essentials and relevant government standards), maintaining governance artefacts and technical standards documentation.  Act as a senior technical reference point within the ICT team, providing mentoring, guidance, and review for junior colleagues and helping to define escalation paths and support best practices.  

Produce operational reporting and service trend analysis, recommending and delivering infrastructure improvements to enhance reliability, performance, and security.  Engage with internal stakeholders and third-party vendors (including Microsoft) to resolve escalations, shape infrastructure roadmaps, and ensure services effectively support Reply’s consultants and project teams.

About the Candidate:

Experienced senior infrastructure engineer with at least five years in endpoint management or infrastructure roles, ideally within secure or regulated environments.  Deep, hands-on expertise across Microsoft 365, Intune (including Autopilot), Entra , Conditional Access, and Purview, with a strong focus on security, compliance, and Zero Trust.  Proficient in Power Shell scripting and familiar with the Microsoft Graph API; ideally comfortable with infrastructure-as-code approaches such as Terraform.  

Strong grounding in Windows and macOS security administration, patching, Bit Locker, Defender for Endpoint, DLP, and broader endpoint security tooling. …