SCADA Engineer Interview Questions UK: 8 Real Questions and What Interviewers Want

Applying for a SCADA Engineer job in the UK? Here is what you are likely to be asked. These questions come from our SCADA Engineer question bank of 12 questions, written for UK employers at mid-level level.

Eight SCADA Engineer interview questions, and what the interviewer is thinking

1. What does a SCADA engineer actually do day to day, and what qualities make a good one?

Why they ask: They want to check you understand the operational and support nature of the job.

2. Which telemetry and communications protocols have you worked with in SCADA, and what are the strengths and weaknesses of each?

Why they ask: Protocol knowledge underpins integration and fault diagnosis.

3. How would you design a resilient SCADA architecture for a system that must be available around the clock?

Why they ask: Availability is critical in utilities and process control, so they test architectural thinking.

4. What principles guide good HMI design, and how does ISA-101 influence the screens you build?

Why they ask: Poor HMI design contributes to operator errors, so they want your design approach.

5. What is the Purdue model, and how would you provide secure remote access for a supplier to a SCADA network?

Why they ask: Remote access is a frequent attack path, so they test your security judgement.

6. How do you manage the loss of communications to a remote site, and what do you expect to see in SCADA when it happens?

Why they ask: Remote telemetry reliability and data integrity are everyday concerns in utilities.

7. Operators call to say trends at several remote sites have flatlined and values look frozen, but no alarms have appeared. What do you do?

Why they ask: Silent failures are dangerous, so they want to see calm, structured fault-finding.

8. Tell me about a time you integrated a new site or system into an existing SCADA, and how you made sure it was right.

Why they ask: They want evidence of careful, structured SCADA integration work.

A sample answer to question 1

What does a SCADA engineer actually do day to day, and what qualities make a good one?

Day to day, a SCADA engineer keeps the system that operators rely on healthy, accurate and secure. That means supporting the control room when screens, trends or alarms misbehave, adding new sites and signals to the tag database, configuring RTUs and PLC communications, and building or amending HMI screens and reports. There's also planned work such as backups, patching under change control, licence and server health checks, and testing before anything goes live. A good SCADA engineer has to be methodical, because a small tagging error can mislead an operator, and calm in a fault, since operations may be depending on you at three in the morning. They also need to communicate well with operators, process engineers, telemetry installers and IT, and to understand the process behind the data rather than treating it as numbers on a screen. Finally, they should be cautious about security and change.

Common mistake to avoid: Describing it as just drawing screens; Ignoring out-of-hours support

Want the rest?

Full model answers, key points and common mistakes for all 12 questions are on the SCADA Engineer interview questions page. The first five are free, no sign-up needed.