OT Security Engineer

Quariq; Houston (TX); On-site; USD 90,000 - 130,000; Full time

Job summary

AG Solution is seeking an OT Security Engineer to advance security for industrial OT networks, including SCADA and PLC environments. You will collaborate with IT/OT teams, assess risks, and implement segmentation and firewall controls to strengthen resilience.

Travel to customer sites is required for commissioning, testing, and audits, with English proficiency essential and additional Spanish or French a plus. The role emphasizes hands-on implementation and clear communication with stakeholders.

Qualifications

• Extensive experience securing industrial OT environments (SCADA/PLCs, DCS).
• Ability to map and understand legacy OT networks and risks.
• Willingness to travel for client engagements and site commissioning/audits.
• Strong written and verbal communication to explain OT security concepts to non-technical stakeholders.

Responsibilities

• Assess OT security posture and risks across client environments.
• Configure and manage firewalls, segmentation, and secure architectures (Purdue model).
• Collaborate with IT/OT teams to align security with production needs.
• Lead commissioning, testing, and audit activities with clients.

Skills

OT security

SCADA/PLCs

Network segmentation

Communication

Cross-functional collaboration

Tools

Fortinet

Nozomi Guardian

Cisco Firewall

Palo Alto

Job description

OT Security Engineer

A proactive and detail-oriented OT Security Specialist with a strong analytical mindset and practical/hands-on experience in securing industrial environments. This professional excels at understanding and managing complex and legacy OT infrastructures, and is able to advocate efficient and transparent solutions ensuring they become secure.

With foundational expertise in OT network technologies and firewall configurations, this specialist can cooperate with other teams—such as operations, IT, and engineering to assess risks, strengthen network segmentation, and maintain a resilient OT security posture.

Key Strengths

• In-depth knowledge of OT security and networking in industrial environments (e.g., SCADA, PLCs, DCS)
• Skilled in analysing and mapping complex or legacy OT networks
• Hands-on experience with segmentation and IP (re-)numbering of OT networks
• Experienced with risk assessments and developing mitigation strategies
• Practical understanding of firewalls, network segmentation, and secure architecture principles - Understanding of the Purdue model
• Hands-on experience in implementation of at least one of the following technologies (OT-firewalling, automated network monitoring, network restructuring)
• Proficient in continuous monitoring using SNMP, NetFlow, or similar protocols
• Works cross-functionally with IT/OT teams to align security with production needs
• Knowledge of Fortinet firewalls configuration
• Experience with Active Directory (AD) management
• Hands-on experience with Nozomi Networks solutions (e.g., Guardian) for network traffic analysis, anomaly detection, and asset visibility in industrial/OT environments is a plus
• Cisco certificate is a plus
• Palo Alto firewall configuration is a plus

Communication & Client Engagement

• Strong verbal and written communication skills, able to translate complex OT security concepts into clear, business-relevant language for both technical and non-technical stakeholders.
• Proactive in client meetings, takes initiative during commissioning, testing, and audit phases to flag risks early, propose solutions, and keep stakeholders aligned rather than waiting to be asked.
• Confident representing the company in front of client teams on-site, building trust and credibility through transparent, solution-oriented dialogue.
• Comfortable working cross-culturally and adapting communication style to different client organizations during international travel.

Travel required to customer sites during key project phases (e.g., commissioning, testing, audits). Flexibility for short-term international travel is essential.

Language

Excellent communication skills in English are required; Spanish and French are a strong asset.

Location

Preferred location is Houston or the surrounding area.

Legal Authorization

Applicants must be legally authorized for employment in the United States without need for current or future employer-sponsored work authorization.

AG Solution is an Equal Opportunity Employer.

Join AG Solution Where Talent Shapes Industry 4.0

At AG Solution, we build intelligent solutions for the process industry, combining automation, process control, data management, and MES/MOM systems to help manufacturers reach operational excellence.

Now part of the Quariq Group, we are one of Europe’s leading Industry 4.0 partners, with more than 400 engineers and consultants working across Europe, the UK, and the US.

Driven by People. Powered by Technology.

Our success starts with our people. We invest in growth through continuous learning, mentorship, and our AG Academy, ensuring every colleague has the opportunity to develop their skills and career. AG Solution is an Equal Opportunity Employer.

We believe that innovation happens when people feel trusted, connected, and inspired.

A Global Team with a Human Touch

With offices in over 15 cities worldwide, we bring together diverse expertise and perspectives — from Antwerp to Barcelona, Rotterdam to Lyon, and New York to Krakow.

At AG Solution, you’ll work on meaningful projects that drive efficiency, sustainability, and digital transformation for leading manufacturers worldwide.

Built to Scale. Driven by Talent.

Ready to shape the future of industry?