Location
Walthamstow, London with hybrid working from Thames Valley-based offices and operational water sites.

Hours
36 hours per week, Monday to Friday, with participation in an on-call rota for out-of-hours support.

Salary
Up to £66,000 per annum, depending on experience, plus a £4,500 car allowance.

About the Role
We are seeking a self-motivated, passionate, and proactive Water Site SCADA Systems Engineer to join our Operational Technology (OT) team. You will be responsible for the daily maintenance and fault-finding of Site SCADA systems including AVEVA System Platform / Wonderware, Iconics, and RSView across critical water treatment works, reservoirs, and booster stations in your region. This role plays a key part in the digital transformation of the UK’s largest water company, ensuring reliable, resilient, and secure SCADA operations that support 24/7 water services.

You will maintain high availability of site-based SCADA platforms targeting 99.2% uptime or higher, deliver planned maintenance such as health checks, patches, and hotfixes, and implement disaster recovery plans including annual backups. You will respond to SCADA-related service requests within 15 working days and implement security improvements to enhance system resilience.

Participation in in-hours and out-of-hours support rosters is required to provide emergency technical support and fault rectification. You will proactively use fault databases to optimise service delivery and escalate recurring faults for root cause analysis and mitigation.

In addition, you will champion OT Change Management and Risk Assessment processes, provide technical input during project design and delivery, ensure all system changes are controlled and documented, and supply SCADA asset, alarm, and event data reports to support operations and compliance. Building and managing key local OT stakeholder relationships is essential to maintain alignment and effective delivery.

As a subject matter expert, you will mentor ICA Technicians and operational teams, foster collaboration within the wider OT Service & Technical team, and contribute to consistent, high-quality support across the organisation.

This is an excellent opportunity to join Thames Water, a company committed to building a better future for customers, communities, and the planet, while enjoying meaningful career opportunities, flexible working arrangements, and excellent benefits.

Experience
- Experience in maintenance and/or delivery of SCADA or ICA systems.
- Proven problem-solving skills balancing technical, operational, and customer-focused decision-making.
- Experience managing competing priorities and delivering both reactive and project-based work is desirable.
- Knowledge or prior experience in the water industry, utilities, or a similar regulated sector is advantageous.
- Experience negotiating with Operations to secure funding for OT hardware is desirable.

About you
- Excellent interpersonal skills with the ability to build strong working relationships with operations teams.
- Strong customer service orientation with effective communication across technical and non-technical audiences.
- Self-motivated, passionate, and proactive with a commitment to continuous improvement.
- Ability to mentor and provide technical guidance to colleagues.

Qualifications
- Recognised technical qualification in OT, ICA, or SCADA systems.
- Hands-on expertise in site-based SCADA and PLC systems with up-to-date knowledge of industry best practices.
- Proficiency in AVEVA System Platform / Wonderware and legacy SCADA systems such as Iconics and RSView.
- Strong IT proficiency including Microsoft Office and Excel for data analysis and reporting.
- Knowledge of extended SCADA programming, MS applications, and IP-based communications (LAN/WLAN).
- Technical problem-solving and fault resolution expertise is desirable.
- Understanding of basic LAN network design and troubleshooting principles.
- Awareness of network redundancy and resilience concepts such as VLANs, subnets, and redundancy protocols is advantageous.