Senior Systems Engineer

Are you ready to take the lead in securing and optimizing IT and operational technology environments? We are seeking a skilled Senior Systems Engineer to join our small, dynamic IT team in Amsterdam.

About the Role

As a Senior Systems Engineer, you will ensure the stability, integrity, and efficiency of our IT infrastructure, with a strong focus on security and operational technology (OT). You will collaborate closely with Operations and OT teams, manage Windows-based environments, and oversee cloud services such as Microsoft 365, Azure, and Intune. Occasional offshore travel is part of the role.

Key Responsibilities

• Systems & Platform Management:

  • Manage and optimize Windows environments, Microsoft 365/Entra ID, Intune/Endpoint Manager, and Azure services

  • Automate tasks and deployments using PowerShell

  • Oversee software deployments and device compliance

  • Ensure system connectivity and interoperability

• Security & Identity Management:

  • Implement and maintain security measures (Conditional Access, MFA, hardening, patching, IAM)

  • Administer Zscaler (ZIA/ZPA) for secure internet and private access

  • Conduct server and security audits, backup procedures, and disaster recovery

• OT System Engineering & Security:

  • Collaborate with Operations/OT to optimize and secure industrial environments

  • Manage OT asset inventory, vulnerability management, and risk reporting

  • Improve network segmentation, secure remote access, and change control in line with IEC 62443 principles

• Support & Collaboration:

  • Provide third-line support and incident coordination

  • Mentor junior IT staff

  • Participate in on-call/standby rotations

• Continuous Improvement:

  • Lead lifecycle upgrades, migrations, and security initiatives

  • Maintain documentation and share knowledge within the team

What We're Looking For

• Proven experience managing Windows-based environments, M365/Entra ID, Intune, Azure, and Zscaler

• PowerShell scripting and automation skills

• Hands-on experience with IAM and security best practices

• Experience with OT industrial environments

• Willingness to travel offshore occasionally

• Excellent analytical, problem-solving, and communication skills

• Ability to work collaboratively in a small, multi-disciplinary team

Qualifications

• Bachelor's degree and at least 7 years of relevant experience, or equivalent

• Certifications in Microsoft (e.g., AZ-104, MS-102), Zscaler, ITIL, or similar are a plus

Meet ONE-Dyas

ONE-Dyas B.V. is the largest privately owned exploration and production company in the Netherlands. As entrepreneurs in Dutch offshore gas and oil, the company aims to make a significant contribution to the energy transition, working at the forefront of sustainability and technological innovation. Extracting gas and oil close to home contributes to the national economy, security of supply, and climate goals by employing local services, products, and know-how, reducing the reliance on imported fuels, cutting emissions, and complying to the highest environmental standards in the industry.

With its roots dating back to 1893 in the mining industry, ONE-Dyas has a long history of successfully pioneering energy solutions. Today, its operations span the full lifecycle of offshore assets in the Netherlands, Germany and the UK, including the flagship N05-A development project in the Dutch and German part of the North Sea, set to be the first of its kind to integrate natural gas, wind power and green hydrogen. ONE-Dyas is also actively exploring carbon capture and storage, and green hydrogen opportunities as future energy solutions.

Headquartered on the Zuidas in Amsterdam with around 150 employees, ONE-Dyas has a strong entrepreneurial culture, short lines across all disciplines and a strong relationship with its shareholders leading to a focused and effective work environment. ONE-Dyas has an excellent reputation in the Netherlands, the UK and Germany for its experience and skills across the entire oil & gas energy supply chain. ONE-Dyas is known for getting things done safe, reliably and efficiently.