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We are looking for an experienced, self-motivated Applications Engineer to join our Operational Technology (OT) team. You will act as a SCADA Subject Matter Expert (SME), responsible for developing, maintaining, and optimising regional and site-based SCADA systems that support Thames Water’s water and wastewater operations. This role supports the digital transformation of the UK’s largest water company, delivering secure, resilient SCADA platforms operating 24/7.
Job Responsibility
Develop and maintain OT SCADA applications across the full lifecycle, from design and build through testing, deployment, and optimisation
Lead SCADA system, application, and framework upgrades to ensure platforms remain secure, supported, and maintainable
Develop and manage SCADA Object Template Libraries, standards, and configurations
Validate and deploy system updates, including Windows patches, security updates, and antivirus updates
Deliver regional and site SCADA developments, including standardised architectures and deployment solutions
Develop SCADA interfaces, data streams, and telemetry communications
Provide technical SCADA input to capital delivery projects through design and commissioning
Ensure SCADA solutions are fit for operational use and support a 99.98% availability target
Provide second-tier OT technical support, including complex fault investigation, hotfixes, and incident resolution
Work with system integrators and vendors to resolve issues and improve system performance
Translate operational requirements into effective SCADA solutions
Contribute to OT strategy, standards, and architecture development
Review emerging SCADA and OT technologies and support continuous improvement
Develop and maintain SCADA-related training content.
Requirements
Strong experience in SCADA programming, development, and maintenance
Proven ability to manage competing priorities in reactive operational environments
Experience with SCADA platforms such as AVEVA/Wonderware System Platform, InTouch, FactoryTalk View, and ClearSCADA
Software development experience using Microsoft .NET, C#, and structured development practices
Experience programming to IEC 61131 standards (LD, SFC, FBD, ST, IL)
Knowledge of Windows operating systems, virtualisation, and IP-based communications
Experience with telemetry protocols including DNP3, WITS DNP3, Modbus, and MQTT
Strong technical documentation and reporting skills
Experience in the water industry, utilities, or similar regulated sectors
HNC (or equivalent) in a relevant technical discipline
Strong understanding of OT systems and architectures
Experience supporting relational and historian databases (e.g. SQL, PI, Wonderware Historian, ClearSCADA)
Proficient in Microsoft Office and Visio
Full UK driving licence.
Nice to have
Experience working within water operations or OT delivery teams
Knowledge of OT methodologies and best practices
Ability to clearly communicate complex technical concepts to non-technical stakeholders.
What we offer
Competitive salary: Up to £66,000 per annum, depending on experience
Car Allowance: £4,500
Annual Leave: 26 days holiday per year, increasing to 30 with the length of service (plus bank holidays)
Performance-related pay plan directly linked to company performance measures and targets
Generous Pension Scheme through AON
Access to lots of benefits to help you take care of you and your family’s health and wellbeing, and your finances – from annual health MOTs and access to physiotherapy and counselling, to Cycle to Work schemes, shopping vouchers and life assurance.