Hire a Certified
SCADA Technician
in Days, Not Months

How do you respond when a critical alarm fires in a SCADA system? Walk me through your process.

Strong candidates describe a structured response: acknowledge the alarm, assess severity and impact, check related tags and field device status, notify operations staff according to escalation procedures, and document the event. Look for candidates who distinguish between nuisance alarms and actual process deviations — and who follow established alarm response procedures rather than improvising.

What steps do you take when SCADA data stops updating from a field device?

Experienced technicians describe a layered diagnostic approach: check communication status at the SCADA server, verify the driver or OPC connection, check network connectivity to the device, inspect the PLC or RTU status directly, and review communication logs for error codes. Candidates who jump straight to "restart the server" without diagnosing the communication layer signal limited troubleshooting depth.

Which SCADA platforms and HMI systems have you worked with, and which protocols are you most familiar with?

Look for hands-on platform experience (Wonderware, Ignition, FactoryTalk, WinCC) and protocol familiarity (Modbus, DNP3, OPC-UA, Ethernet/IP). Strong candidates describe real-world work — configuring tags, building trends, setting up alarm limits — not just passive observation. Candidates who can only name a single platform may lack the flexibility required in multi-vendor environments.

Describe a time you helped prevent or minimize downtime using SCADA monitoring. What did you notice and what did you do?

This question separates reactive operators from proactive technicians. Look for candidates who describe identifying a developing issue through trend analysis, abnormal tag behavior, or early alarm patterns — and who took action before a failure occurred. Candidates who can only describe responding to outages after they happen signal limited situational awareness.

How do you approach SCADA system security, and what steps do you take to protect against cyber threats?

Mature technicians describe OT/IT network segmentation, role-based access control, patch management procedures, USB port restrictions, and compliance with frameworks like NERC CIP or IEC 62443. Look for awareness that SCADA systems are high-value targets and that security is an operational responsibility — not just something handled by the IT department.

How do you document changes to SCADA configurations and ensure backup integrity?

Strong candidates describe a change management process: documenting the change before and after, backing up the configuration to a secure location, testing in a staging environment when available, and maintaining version history. Look for awareness that undocumented changes create operational risk — especially during emergency response when another technician may need to restore the system quickly.