OT Solutions Architect — Secure SCADA & Industrial Tech

Southern Water; Durrington; Hybrid; GBP 80,000 - 115,000; Full time

Job summary

Southern Water is seeking an experienced OT Solutions Architect to design secure, scalable OT solutions for critical water and wastewater operations. The role spans ICS, cybersecurity and digital transformation, requiring collaboration with engineering, IT and operations teams.

You will govern OT architectures across SCADA, PLC, DCS, HMI, historian and networks, ensuring secure data flows, governance and compliance with IEC 62443, NIST and ISO 27001.

Qualifications

• Significant experience in Operational Technology and industrial control system architecture.
• Experience designing OT solutions across SCADA, PLC, DCS, RTU, HMI and historian technologies.
• Knowledge of industrial protocols such as OPC-UA, Modbus/TCP, DNP3, PROFINET, Ethernet/IP and BACnet.
• Experience designing secure OT networks with segmentation, firewalls and Purdue Model principles.
• Strong OT cybersecurity knowledge including IEC 62443, NIST and ISO 27001.
• Experience integrating OT with wider enterprise platforms, cloud or edge technologies.

Responsibilities

• 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 ensure alignment with standards.
• Lead technical engagement with system integrators, vendors and operational stakeholders.
• Support deployment, testing, commissioning and migration activities across OT environments.

Skills

SCADA

PLC

DCS

RTU

HMI

Historian

Industrial networks

OPC-UA

Modbus/TCP

DNP3

PROFINET

Ethernet/IP

BACnet

OT security

IEC 62443

NIST

ISO 27001

OT governance

System integration

Cloud/edge

Tools

Purdue Model

Job description

Southern Water is seeking an experienced OT Solutions Architect to design secure, scalable OT solutions for critical water and wastewater operations. The role spans ICS, cybersecurity and digital transformation, requiring collaboration with engineering, IT and operations teams.

You will govern OT architectures across SCADA, PLC, DCS, HMI, historian and networks, ensuring secure data flows, governance and compliance with IEC 62443, NIST and ISO 27001.