What OT Cybersecurity Certifications Tell You About a Candidate
A candidate has the certification you asked for. Good. Now ask which part of your job that credential helps you understand. If nobody on the hiring panel can answer, the requirement may be screening people out without making your decision any clearer.
Credentials give you a useful starting point. The next conversation needs to establish how the person has applied the knowledge, what they owned and how that experience fits the work you need done.
Read the scope before you write the requirement
Certification names can look interchangeable in a job description. Their coverage is different. GIAC describes GICSP around industrial control systems security, including architecture, defense, incident response and governance. ISC2's CISSP spans broader information security domains, including risk, engineering, operations and software security. ISA's IEC 62443 certificate program covers fundamentals, risk assessment, design and maintenance through distinct certificates.
Those differences should change your interview. A broad security credential might support a conversation about enterprise risk and governance. A certificate covering industrial security design provides a reason to explore design decisions. Neither tells you, on its own, whether this person has led the particular work your position requires.
Write down why a credential matters to the role. If a client contract requires it, say so. If the real requirement is knowledge that several routes can establish, describe that knowledge and consider equivalent evidence. Your screening team needs to know which requirements are firm and which allow judgment.
Turn a credential into a useful question
Give candidates room to explain without disclosing a former employer's confidential information. A simplified example can still show the decisions, constraints and personal contribution. You are looking for a coherent account of their work.
| What you need | A question worth asking | What to listen for |
|---|---|---|
| A segmentation design | Walk us through a design you helped put into service. | Their decisions, dependencies, review process and changes made during implementation. |
| An OT security program | Which risk did you take to leadership, and what happened? | Clear ownership, a reasoned recommendation and the business response. |
| Operational monitoring | Describe an alert you investigated with plant personnel. | How they established context, checked evidence and involved the right people. |
Two resumes, one engineering vacancy
Consider a fictional search for an engineer who will coordinate security changes across three manufacturing sites. One applicant lists several credentials and describes supporting a consulting team. Another lists one credential and describes preparing change plans, working through plant objections and following changes into operation.
The credential count will not settle this comparison. Ask both people about a change that did not proceed as planned. Who identified the issue? What did they recommend? Who approved the next action? What record did they leave for the operating team? The answers help you compare experience at the level the job requires.
The first applicant may have much deeper responsibility than the resume suggests. The second may have handled a narrower part of the work. Leave space for either conclusion and record what the conversation actually establishes.
Keep three observations separate
A candidate may be strong in one area and still need development in another. That is useful information for deciding the level of the role, the support needed after hiring and the next interview question. Combining everything into a quick impression of 'certified' loses that detail.
Before publishing the vacancy, have the hiring manager review every credential requirement beside an actual responsibility. Keep the requirements that help explain the job. Use the interview to find out who can carry those responsibilities in your environment.
- Credential status: confirm the exact award and, where applicable, current status through the issuer's verification process.
- Relevant knowledge: ask the person to explain an approach, its assumptions and the conditions that would change it.
- Applied experience: establish what the person personally delivered, decided or supported, with a suitable example.
Bring the role and the questions you still have about a candidate. We can agree on an assessment that explores the relevant work.
Discuss an Assessment