IT System Administrator

📋 Job Overview

Thorizon runs a modern, cloud-first IT environment built on Microsoft 365 and Azure. It is designed for an AI-driven way of working and for the security and sovereignty requirements of the nuclear sector. As our System Administrator, you are the hands-on owner of that environment. You make sure our engineers, scientists and support teams in Amsterdam and Lyon can work securely and without friction, every day. You will continuously improve the environment through automation and good documentation. Roughly two thirds of the role is operations, security and service, and one third is improvement and automation projects. Over time, there is room to grow towards cloud and platform engineering. You will report to our Data & AI Director and work closely with external partners and vendors and with our engineering teams. This role is based in Amsterdam, The Netherlands.

🏢 About Thorizon

Thorizon is a nuclear deep-tech company focused on developing new reactor systems. We operate in a highly regulated sector where integrity, security and sovereignty truly matter. Our team combines engineering rigor, scientific excellence, and entrepreneurial drive to advance Europe's energy future.

🎯 The Role

You will be the hands-on owner of Thorizon's IT environment, ensuring our engineers, scientists and support teams can work securely and without friction. You will administer and continuously improve our Microsoft 365 and cloud environment, operate our zero-trust and secure-access setup, and manage office networks, printing and meeting rooms at both sites. You will also run IT operations and support, including the service desk, onboarding and offboarding, device lifecycle and asset management, licensing, and incident, change and problem management.

✅ Key Responsibilities

• Administer and secure our IT environment, including Microsoft 365, identity and access, devices, and tooling for collaboration and security
• Operate our zero-trust and secure-access setup and investigate and follow up on security alerts
• Manage office networks, printing and meeting rooms at both sites
• Make sure backup, monitoring and recovery are in place and tested
• Run IT operations and support, including the service desk, onboarding and offboarding, device lifecycle and asset management, licensing, and incident, change and problem management
• Be the go-to person for colleagues with IT questions and solve issues yourself or coordinate with vendors
• Manage key IT suppliers and service partners, and keep licensing and costs under control
• Document systems, procedures and decisions so that knowledge does not live in one person's head
• Support our information security function in policies, access reviews, risk assessments, vulnerability management, audits and security incidents
• Ensure that systems, data storage, and remote and vendor access comply with export control requirements and with the integrity and traceability expectations of a safety-critical environment
• Replace manual work with scripted and repeatable solutions, using PowerShell, Intune and Entra configuration, and increasingly infrastructure as code
• Support the IT side of engineering platforms, such as CAD and version control systems, simulation and data environments, and secure environments for AI tools

📌 Required Qualifications

• 3 to 10 years of experience in system administration or IT engineering, ideally in a growing, technical or regulated organisation
• Strong hands-on experience with Microsoft 365, Entra ID and Intune, and working knowledge of cloud computing
• A solid grasp of security fundamentals, including identity and access management, endpoint security, patching and zero-trust principles
• Scripting skills in PowerShell, or comparable skills in Python or Bash
• Fluency in English

⭐ Desirable Experience

• Experience with Infrastructure as Code, Git, CI/CD, HCP and SASE or ZTNA platforms
• Experience in nuclear, defense, aerospace or other export-controlled or safety-critical industries
• Knowledge of Dutch or French

🎁 Benefits

The opportunity to help realize the most promising reactor technology and advance Europe's energy future. Being part of an exceptional team that combines engineering rigor, scientific excellence, and entrepreneurial drive. Working in multidisciplinary teams on ambitious missions, with responsibility and meaningful impact from day one. A fast-moving deep-tech environment where initiative is valued and people are trusted to make decisions. Complex, multidisciplinary challenges that will stretch you and accelerate your growth. Competitive compensation and participation in our employee profit-sharing plan. An international workplace with offices in the heart of Amsterdam and Lyon.

🛂 Visa & Eligibility

You will work directly with engineers who design a new reactor system, in a sector where integrity, security and sovereignty truly matter. This role is based in Amsterdam, The Netherlands.