An electrician can interview well and still struggle to troubleshoot a circuit. A technician can be quiet in a conference room and excellent once the tools come out.
That is why some employers add a working interview or skills demonstration to the hiring process. The idea is sound: if the job depends on practical ability, give the candidate a fair chance to demonstrate it.
The trouble starts when “working interview” means something different to everyone involved. One candidate gets a 20-minute bench test. Another spends half a day helping on a live job. The supervisor watches both, takes no notes, and makes a decision based on who seemed more confident.
That is not much better than guessing.
A useful skills demonstration should answer a defined question, use a job-relevant exercise, and give every candidate a comparable opportunity to succeed. It should also respect the candidate’s time and avoid turning an interview into free labor.
Start with the skill you actually need to see
Do not begin by asking, “What task can we give them?” Begin with, “What uncertainty are we trying to resolve?”
Maybe you need to know whether an electrical candidate follows a safe troubleshooting sequence. Maybe a diesel technician needs to interpret diagnostic information before replacing parts. Maybe a warehouse lead needs to prioritize a short list of competing problems at the start of a shift.
Choose one or two skills that are both important to the role and difficult to confirm through conversation alone. Then design the exercise around those skills.
This keeps the assessment focused. It also prevents a common mistake: testing whatever is easiest to set up instead of what matters on the job.
Build a short, controlled exercise
The best exercise is usually a realistic sample, not an actual backlog item.
An electrician might inspect a de-energized training board with several planted faults and explain the diagnostic sequence. A technician might review a written work order, service history, and scan results, then describe the next checks. A construction superintendent candidate might review a sample schedule disruption and explain how the day should be reorganized.
Keep the conditions controlled. Provide the same instructions, tools, time limit, and information to each candidate. If one person receives hints and another does not, the results are hard to compare.
Tell candidates in advance:
- what the exercise is meant to evaluate;
- how long it should take;
- what tools or protective equipment will be provided;
- whether they need to bring anything;
- whether the exercise is paid; and
- who will observe and answer safety questions.
Surprises do not make an assessment more realistic. They mostly test whether a candidate guessed what you had in mind.
Score the work before discussing whether you “liked” the person
A simple scorecard makes the decision more consistent. Write it before the first candidate arrives, and use the same criteria for everyone.
Here is a basic example for a troubleshooting exercise:
| Criterion | What the observer looks for | Rating |
|---|---|---|
| Safety and setup | Identifies hazards, uses required PPE, confirms conditions before starting | 1–5 |
| Process | Uses a logical sequence instead of jumping to conclusions | 1–5 |
| Technical judgment | Interprets the available information accurately | 1–5 |
| Communication | Explains decisions and asks relevant questions | 1–5 |
| Work quality | Reaches a sound result and checks the work | 1–5 |
Add short notes beside each rating. “Good attitude” is not useful evidence. “Stopped to verify the circuit was de-energized before touching the panel” is.
Have observers complete the scorecard before comparing impressions. Otherwise, the loudest opinion in the room can shape everyone else’s memory.
Separate skill from personal style
Working interviews can uncover ability, but they can also create new opportunities for bias.
One candidate may narrate every step. Another may work quietly and explain the process when asked. One may move quickly because the setup is familiar. Another may take an extra minute to inspect unfamiliar equipment.
Those differences matter only when they affect the job.
If the role requires regular coordination with a crew, include communication in the scorecard and define what good communication looks like. If it does not, be careful about treating an outgoing style as proof of competence.
The question is not, “Did this person do it exactly the way our current employee would?” The question is, “Did this person work safely and demonstrate the skill to the standard this job requires?”
Do not use candidates to finish real work for free
An assessment becomes questionable when the candidate is producing useful work for the business, covering part of a shift, serving customers, or spending meaningful time on the exercise without pay.
If the company receives productive value from the work—or the demonstration is lengthy—paying the candidate is the cleaner and more respectful approach. Be explicit about the rate, expected duration, and payment process before the candidate agrees.
A short simulation on isolated training equipment is different from sending someone onto a live jobsite for several hours. Calling both of them an “interview” does not make the practical or legal differences disappear.
Before using any working-interview format, confirm the applicable wage-and-hour, safety, insurance, union, and local legal requirements with qualified advisors. The rules and risks can vary by location, worksite, and the way the exercise is structured.
Safety rules still apply
A candidate may be experienced, but your facility, tools, and procedures are new to them.
Do not create an artificial pressure test by withholding safety information. Give the required briefing. Provide the correct equipment. Identify restricted areas. Stop the exercise if conditions become unsafe.
It is reasonable to observe whether a candidate recognizes hazards and follows instructions. It is not reasonable to expose someone to an avoidable hazard to see how they react.
Whenever possible, use a de-energized system, training area, mock work order, sample plan, or other controlled environment. You can still evaluate judgment without putting the candidate, employees, customers, or property at unnecessary risk.
Close the loop with the candidate
At the end, tell the candidate what happens next and when to expect a decision. Make sure any payment paperwork is complete. Give them a chance to ask questions about the equipment, team, or actual work.
The exercise is not only an evaluation of the candidate. It is also a close look at how your company prepares people, communicates expectations, and treats their time.
A well-run working interview does not need to be elaborate. It needs a clear purpose, a realistic but controlled task, consistent scoring, safe conditions, and honest terms. Build those pieces first, and the exercise can give you evidence that another hour of interview questions probably will not.