Senior OT Security Engineer

Senior OT Security Engineer - Technology and Transformation - Cyber

What impact will you make?

#YourOpportunity

Do you thrive at solving complex challenges? Want to work on next-generation, cutting-edge products and services that deliver outstanding value? Work with other experts in your field? Work for a world-class organization that provides exceptional career experience and an inclusive and collaborative culture? Want to make an impact that matters? Consider joining Deloitte.

We are currently seeking an enthusiastic team player with exceptional security engineering skills and a well-rounded personality to become part of our dynamic Cyber team in our offices in Athens. The team is part of a European network, where brilliant colleagues collaborate across Deloitte locations to deliver services to our clients both in Greece and abroad.

As a Senior OT Security Engineer, you will design, implement, and support leading cybersecurity solutions for our clients’ Operational Technology (OT) environments. Typical engagements include the design, deployment, and optimization of security technologies across critical infrastructure and industrial environments, helping organizations enhance the security, resilience, and reliability of their operational systems while addressing emerging cyber threats.

#YourRole

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.

#AboutDeloitte

Our services

Deloitte offers Global professional services that include Audit, Risk Advisory, Tax, Consulting and Financial Advisory. Our approach combines insight and innovation from multiple disciplines with global business and industry expertise to help our clients excel anywhere in the world.

We deliver outstanding impact on the reputation and success of our clients, in Greece and globally. In pursuing this we contribute to a sustainable and prosperous society, and are firm believers in the positive impact business can and should have on the world it operates within.

Our Purpose

Our purpose, “To make an impact that matters for our clients, our people and society “- defines who we are and what we stand for. This is not about size, it's about being the first choice. The first choice for the largest and most influential clients, and the first choice for the best talent.

Our values

At Deloitte we foster a collaborative culture where talented individuals can produce their best work. We value innovative thinking, diverse insights and a genuinely distinctive level of customer service. We value difference, with respect at the heart of our inclusive culture, and we support agile working arrangements.

Our talent experience

From day one at our firm, practitioners are part of a community. Our development and career progression framework will help them develop the skills and capabilities to succeed. The wellness of our people and the ability to offer agile working arrangements is at the centre of our unique talent experience. We create a workplace that encourages collaboration, creativity, inclusiveness to ensure our staff are supported, encouraged, and feel a sense of purpose and meaning in what they do each day.

Sounds like the sort of role for you? Apply now.