senior ot security engineer

As a Senior OT Security Engineer, you will work alongside highly skilled Cyber Security professionals who are passionate about technology, committed to excellence, and driven by delivering value to our clients. Collaboration, innovation, and a strong customer focus are at the core of everything we do.

In this role, you will contribute to complex OT security engagements, collaborate with leading industry specialists, and help protect some of the most critical operational environments across business-critical sectors. Leveraging Deloitte's continued investment in emerging technologies, strategic alliances, and specialist talent, you will play a key role in helping organizations enhance the security, resilience, and reliability of the industrial systems that underpin modern society.

You will have the opportunity to support the design, delivery, and implementation of best-in-class cybersecurity solutions for leading organizations operating critical infrastructure and industrial assets. Working across technical advisory engagements, security architecture initiatives, and technology implementation projects, you will help clients address evolving cyber risks and strengthen the resilience of their operational technology environments.

At Deloitte, you will benefit from continuous learning opportunities, exposure to complex and challenging projects, and the chance to collaborate with experts across our European network - accelerating your professional growth while making an impact that matters.

During your tenure as a Senior OT Security Engineer, you should be able to:

• Monitor and secure OT/ICS environments using OT threat-detection platforms.

• Analyze and respond to alerts, identifying anomalies and suspicious activity across industrial networks.

• Support clients in identifying security weaknesses and improving their cyber resilience through the design and development of custom detection rules and use cases tailored to OT/ICS systems.

•  Assess industrial network architectures, improve network segmentation, and enhance the security and operational resilience of OT environments.

• Support vulnerability management activities and remediation planning initiatives across OT environments.

• Cross-functional collaboration with OT, network and field engineers to embed security into operational processes.

• Act as a technical lead during client engagements, solution implementations, and project delivery activities, providing guidance and mentorship to junior team members.

#WinningRequirements

To be successful in this role, you will bring a combination of OT/ICS security expertise and strong network security fundamentals. We are looking for candidates who have:

• Bachelor’s or Master’s degree in Computer Science, Electrical/Computer/Network Engineering, Information Security or a related field - or equivalent practical experience.

• At least 3 years of experience in cybersecurity with strong background in Security Network Engineering with hands-on experience on network security controls design, implementation and configuration).

• Hands-on experience with OT/ICS threat-detection and monitoring platforms. Relevant vendor certifications in these technologies will be considered an asset.

• Practical knowledge of industrial environments (PLCs, SCADA, DCS, and HMIs), systems and protocols (Modbus, DNP3, PROFINET, Omnibus, OPC-UA) with knowledge and understanding of the Purdue mode.

• Familiarity with OT security standards and frameworks (e.g., IEC 62443 / ISA 99, NIST SP 800-82), and industrial network architectures.

• Solid understanding of network routing and switching, including VLANs, ACLs, and secure network segmentation. Relevant networking certifications (e.g., CCNA, CCNP, or equivalent) would be considered an asset.

• Working knowledge of SIEM, IDS/IPS, and firewall technologies.

• Strong analytical and problem-solving skills, with the ability to communicate technical concepts clearly to both technical and non-technical stakeholders.

• Strong passion for OT cybersecurity and advisory services, coupled with a proactive drive for continuous learning and knowledge sharing.

• Fluency in Greek and English, both written and spoken.

#ChooseDeloitteif:

• You want to work with inspiring, ambitious, and supportive people with diverse geographical and academic backgrounds and extensive skills.

• You get excitement in managing clients shifting priorities and accomplish tasks in a challenging, fast-paced environment.

• You like to nurture people and share your knowledge with others.