We are supporting a rapidly growing international energy technology company in the appointment of an OT / ICS Cybersecurity Engineer to help protect its grid-connected battery energy storage sites and associated control systems.

This is not a traditional corporate IT security position. The role focuses on Operational Technology security: protecting the physical equipment, industrial control systems and communications networks that operate large-scale BESS facilities.

You will also ensure that battery sites can communicate securely with the company’s cloud-based Virtual Power Plant platform.

Key responsibilities
- Secure communications between BESS sites and the cloud/VPP platform.
- Design and maintain secure separation between OT and corporate IT networks.
- Protect SCADA systems, PLCs, RTUs, inverters and other site-control equipment.
- Configure and review firewalls, VPNs, encryption and access controls.
- Secure remote access for engineers, operators and approved third parties.
- Identify vulnerabilities across operational systems and site networks.




- Monitor OT environments for cyber threats and suspicious activity.
- Support incident response and remediation across live operational assets.
- Ensure compliance with relevant industrial cybersecurity standards.
- Work closely with engineering, software, operations and project-delivery teams.

What we’re looking for
- At least three years’ experience in OT, ICS or industrial cybersecurity.
- Practical experience protecting live industrial, energy or grid-connected assets.
- Strong knowledge of IEC 62443.
- Experience with OT/IT network segmentation and the Purdue Model.
- Understanding of industrial communication protocols such as IEC 61850, Modbus or DNP3.
- Experience securing SCADA systems, PLCs, RTUs, inverters or similar operational equipment.
- Hands-on knowledge of firewalls, VPNs, encryption, access controls and secure remote-access solutions.
- Ability to assess vulnerabilities and translate security r

📌 OT / ICS Cybersecurity Engineer (Madrid)
🏢 NetZero
📍 Madrid