The Nuclear Energy Agency - IT Systems Architect

The Organisation for Economic Co-operation and Development ( OECD ) is an international organisation comprised of 38 member countries, that works to build better policies for better lives. Our mission is to promote policies that will improve the economic and social well-being of people around the world. Together with governments, policy makers and citizens, we work on establishing evidence-based international standards, and finding solutions to a range of social, economic and environmental challenges. From improving economic performance and creating jobs to fostering strong education and fighting international tax evasion, we provide a unique forum and knowledge hub for data and analysis, exchange of experiences, best-practice sharing, and advice on public policies and international standard-setting.

The Nuclear Energy Agency ( NEA ) is an intergovernmental agency which operates under the framework of the Organisation for Economic Cooperation and Development (OECD). It facilitates co-operation among countries with advanced nuclear technology infrastructures to seek excellence in nuclear safety, technology, science, related environmental and economic matters and law. The mission of the NEA is to assist its 34 member countries in maintaining and further developing, through international cooperation, the scientific, technological and legal bases required for a safe, environmentally sound and economical use of nuclear energy for peaceful purposes. It strives to provide authoritative assessments and to forge common understandings on key issues as input to government decisions on nuclear technology policies.

The NEA is seeking an experienced IT Systems Architect to design, implement, and govern a secure, resilient, and cost effective hybrid infrastructure centered on Microsoft technologies, and including Linux systems. This role manages the lifecycle of Windows Servers, Microsoft 365, and Microsoft Azure services across a mixed environment of on premises virtualized workloads and cloud platforms. Reporting to the IT Systems Manager, this position will be involved in core IT Operations and Support, ensuring high availability, performance, and adherence to security and compliance rules.

Main Responsibilities

Ideal Candidate Profile

Academic and Professional Background

Tools & Technical Skills

- Backup: Microsoft 365 Backup, Azure Backup, Veeam Backup & Replication.

- ITSM platform: Freshservice, ServiceNow, Jira, Remedy or other

- Certifications: Microsoft 365 Certified: Enterprise Administrator Expert; Microsoft Certified: Windows Server Hybrid Administrator Associate, ITIL v4 Foundation.

Responsibilities

Define and maintain the target-state architecture for a hybrid Microsoft ecosystem spanning on premises datacenters and Azure.; Oversee and define solution designs for identity, access, storage, and compute.; Develop reference architectures and standards for Windows Server, Microsoft 365, and Azure services and produce high quality architecture artefacts (design diagrams, runbooks).; Deploy and optimize Hyper V–based virtualization, manage clusters, host configuration, VM templates, and performance.; Administer VMware virtual machines and optimize Microsoft licensing.; Plan and execute server lifecycle management (capacity planning, patching, image baselines).; Manage Azure subscriptions, resource groups, policy, RBAC, and tagging.; Define and apply backup and recovery procedures.; Provide end-to-end administration and operational oversight of Microsoft 365 (Exchange Online, SharePoint Online, OneDrive, Teams, Intune/Endpoint Management, Purview).; Manage Entra ID, conditional access, identity protection, MFA, SSO, privileged identity management (PIM).; Establish device compliance and configuration policies (Intune/Autopilot), application protection, and update rings.; Provide Tier 2 support for incidents and problems, guide root cause analysis and permanent fixes.; Mentor and enable the IT Support team with runbooks, knowledge articles, and training to improve first call resolution.; Participate in calls for tender, and change advisory processes.; Maintain comprehensive architecture documentation, inventories, topology maps, and SOPs.; Establish governance for resource naming, tagging, cost allocation, backup, and data retention.; Carry out other related duties assigned by the NEA IT Systems Manager.

Requirements

A university degree in computer science, information systems, or equivalent work experience.; 3 - 5 years of progressive experience in infrastructure engineering with a focus on Microsoft technologies.; At least 5 years of experience with Windows Server (2019/2022/2025), Active Directory/Entra ID, Group Policy, DNS/DHCP, ADFS, AD Certificate Services, file/print services.; At least 3 years of experience administering Microsoft 365 in a hybrid environment.

Nice to have

Hyper-V experience: Storage Spaces Direct (S2D) cluster.; Experience with Microsoft Azure; Exposure to VMware vSphere/ESXi; Experience with Linux systems; Proficiency with PowerShell scripting and automation; Familiarity with Infrastructure as Code (Bicep/ARM/Terraform)