OT Cyber Security Engineer Commissioning

About the Role

Larsen & Toubro is seeking an OT Cyber Security Engineer Commissioning to support the commissioning, testing, integration, and handover of Operational Technology (OT) Cyber Security systems for power and energy projects. This full-time position is based in Riyadh, Saudi Arabia, and requires 5-10 years of experience.

Key Responsibilities

The role involves hands-on site activities and close collaboration with various teams and stakeholders to ensure successful commissioning and compliance with project cybersecurity requirements. Responsibilities include:

• Executing commissioning and site acceptance activities for OT Cyber Security systems, including configuration, testing, troubleshooting, and validation of OT security infrastructure.
• Performing installation and commissioning of industrial firewalls, OT switches, network segmentation/DMZ infrastructure, secure remote access solutions, SIEM/security monitoring systems, antivirus/EDR solutions, jump servers/bastion hosts, patch management, and OT asset monitoring systems.
• Configuring and troubleshooting industrial firewalls and security appliances, implementing and verifying firewall rules, NAT, routing, VPN, and access-control policies.
• Performing hardening of OT servers, workstations, engineering stations, and network devices, implementing security baselines, and supporting Windows hardening, account/password policies, USB/device control, application whitelisting, and security patches.
• Preparing and executing OT Cyber Security test procedures, conducting FAT/SAT, functional testing, and integrated system testing, and verifying cybersecurity controls.
• Configuring and validating the collection of security logs from OT assets, integrating critical OT systems with SIEM/security monitoring platforms, and supporting cybersecurity monitoring and incident investigation.
• Supporting OT vulnerability assessment and remediation activities, reviewing vulnerability scan results, and coordinating remediation with OEMs/system vendors.
• Preparing and reviewing cybersecurity documentation, including commissioning procedures, FAT/SAT reports, firewall rule matrices, network architecture diagrams, and as-built documentation.
• Coordinating with Project Engineering, Commissioning, SCADA/EPMS, Telecom, Networking, and Control System teams, as well as OEMs, cybersecurity solution vendors, and client/consultant teams.

Key Performance Areas

The engineer will be expected to complete OT cybersecurity commissioning activities according to the project schedule, achieve successful FAT/SAT and integrated testing, minimize cybersecurity-related commissioning punch points, and ensure cybersecurity compliance before system handover.

Candidate Profile

The ideal candidate is a hands-on OT Cyber Security commissioning professional with an understanding of both cybersecurity and industrial control systems, rather than solely an IT cybersecurity engineer. Practical experience in firewall configuration, OT DMZ, network segmentation, SCADA/EPMS environments, SIEM, hardening, vulnerability remediation, SAT, and client-facing commissioning is strongly preferred.