OT Solutions Architect

Southern Water; Worthing; Hybrid; GBP 85,000 - 100,000; Full time

Benefits offered by this job

Company bonus

Pension

Life assurance

Health benefits

Volunteer days

28 days holiday

Occupational health service

Retail discount app

Maternity leave & flexible return

Job summary

Southern Water in Worthing area is seeking an experienced OT Solutions Architect to lead secure, scalable OT designs for critical water and wastewater operations, spanning SCADA, PLC, DCS and IT/ OT interfaces.

You will work with engineering, IT, cybersecurity and external partners to deliver resilient architectures, align with IEC 62443, NIST and ISO 27001, and help modernise essential infrastructure for millions of customers.

Qualifications

• Extensive OT and ICS architecture experience.
• Experience with SCADA/PLC/DCS/RTU/HMI.
• Knowledge of industrial protocols and integration.
• Strong OT cybersecurity background and governance.
• Ability to lead cross-disciplinary teams across OT/IT.

Responsibilities

• Design OT architectures for SCADA, PLC, DCS, and HMI environments.
• Govern OT architectures across multiple operational environments.
• Collaborate with engineering, operations, IT, cybersecurity and vendors.
• Ensure designs align with IEC 62443, NIST and ISO 27001.
• Support deployment, testing, commissioning and migration activities.

Skills

OT Architecture

SCADA/PLC/DCS/HMI

Industrial Networks

OT Cybersecurity

Stakeholder Leadership

Data Integration

Education

TOGAF

SABSA

CISSP

GICSP

ISA/IEC 62443

Tools

OPC-UA

Modbus/TCP

DNP3

PROFINET

Ethernet/IP

BACnet

Purdue Model

IEC 62443

NIST

ISO 27001

Job description

# Southern Water## OT Solutions ArchitectApply: Worthing: Posted Today: End Date: November 11, 2026 (13 days left to apply): JR9195**Closing Date**2026-12-01**Job Title: OT Solutions Architect****Location: Falmer or Durrington – Hybrid working (2 days a week)****Salary: depending on skills and experience****Help shape the future of operational technology at Southern Water.** We're looking for an experienced **OT Solutions Architect** to lead the design of secure, resilient and scalable Operational Technology (OT) solutions that support critical water and wastewater operations. This is an exciting opportunity to work at the intersection of industrial control systems, cybersecurity and digital transformation, helping to modernise essential infrastructure that serves millions of customers.**What will you be doing?**As an OT Solutions Architect, you'll be responsible for developing and governing OT architectures across our operational environments, ensuring solutions are secure, reliable and aligned with enterprise technology strategies. You'll work closely with engineering, operations, IT, cybersecurity teams and external partners to deliver innovative solutions that support safe and efficient operations.**Key responsibilities include:*** Designing OT architectures across SCADA, PLC, DCS, HMI, historian and industrial network environments.* Developing integrated OT/IT solutions and defining data flows and system interfaces.* Providing technical assurance and governance for OT designs and implementations.* Supporting OT cybersecurity initiatives and ensuring alignment with standards such as IEC 62443, NIST and ISO 27001.* Leading technical engagement with system integrators, vendors and operational stakeholders.* Supporting deployment, testing, commissioning and migration activities across OT environments.**What are we looking for?**You'll bring significant experience in Operational Technology and industrial control system architecture, with a deep understanding of complex operational environments.We're particularly interested in candidates with:* Experience designing OT solutions involving SCADA, PLC, DCS, RTU, HMI and historian technologies.* Knowledge of industrial communications protocols such as OPC-UA, Modbus/TCP, DNP3, PROFINET, Ethernet/IP and BACnet.* Experience designing secure OT networks, including segmentation, firewalls and Purdue Model principles.* Strong understanding of OT cybersecurity, including IEC 62443, NIST and ISO 27001 frameworks.* Experience integrating OT environments with wider enterprise platforms, cloud or edge technologies.* The ability to influence stakeholders and provide technical leadership across multidisciplinary teams.**Desirable*** TOGAF, SABSA, CISSP, GICSP or ISA/IEC 62443 certifications.* Experience working within highly regulated or safety-critical industries such as water, energy, transport or pharmaceuticals.* Exposure to digital twins, predictive maintenance or advanced analytics solutions.**Why join Southern Water?**This role offers the opportunity to play a key part in the modernisation and security of critical national infrastructure. You'll work on complex and rewarding projects, collaborate with talented specialists and help shape the future of operational technology across Southern Water.### Interested in the role?* We reserve the right to close this advertisement early if we receive a high volume of suitable applications, so if you are interested in the position please do send your application over today to ensure consideration.* We truly appreciate every application. Please note, that due to the volume of interest, we may not be able to provide personalised feedback to all applicants.### Our Benefits* Company and performance-related bonus* Generous pension* Life assurance payment equal to four times your annual salary* Health benefits through a Cash Plan* Two paid community volunteering days a year* 28 days annual holiday* Occupational health service* Retail discount app* We offer competitive maternity leave, and flexible return to work options### Everybody Welcome* We value diversity and are committed to providing an inclusive and accessible recruitment process. If you require any reasonable adjustments to facilitate your participation in the recruitment process, please do not hesitate to let us know.### Need flexibility in your work?* Does this opportunity excite you but you’re not 100% sure if you meet all the requirements for the role? Or are you concerned that ‘normal’ office hours aren’t possible given your personal circumstances? Whilst we can’t accommodate every flexible working request, we’ll try to find a practical solution. So why not engage with us and find out more about this role?