OT Solutions Architect

Southern Water is recruiting for the role of OT Solutions Architect. An OT Solutions Architect is needed to design and govern secure, reliable OT architectures for operational environments. The role works across engineering, operations, IT, cybersecurity and external partners to support safe and efficient water and wastewater operations.

Role details

• Location: Worthing
• Closing date: 11/11/2026

What you’ll do

• Design OT architectures across SCADA, PLC, DCS, HMI, historian and industrial network environments.
• Develop integrated OT/IT solutions and define data flows and system interfaces.
• Provide technical assurance and governance for OT designs and implementations.
• Support OT cybersecurity initiatives and alignment with relevant standards.
• Lead technical engagement with system integrators, vendors and operational stakeholders.
• Support deployment, testing, commissioning and migration activities across OT environments.

What they’re looking for

• Bring significant experience in Operational Technology and industrial control system architecture.
• Have a deep understanding of complex operational environments.
• Have experience designing OT solutions involving SCADA, PLC, DCS, RTU, HMI and historian technologies.
• Know industrial communications protocols such as OPC-UA, Modbus/TCP, DNP3, PROFINET, Ethernet/IP and BACnet.
• Have experience designing secure OT networks, including segmentation, firewalls and Purdue Model principles.
• Have strong understanding of OT cybersecurity, including IEC 62443, NIST and ISO 27001 frameworks.
• Be able to influence stakeholders and provide technical leadership across multidisciplinary teams.

Additional role information

• TOGAF, SABSA, CISSP, GICSP or ISA/IEC 62443 certifications are desirable.
• Experience working within highly regulated or safety-critical industries is desirable.
• Exposure to digital twins, predictive maintenance or advanced analytics solutions is desirable.