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Janitor (TERM)
Posted May 11, 2026 · We last checked this listing on Oct 6, 2026
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Likely interview questions for this role
Written from this job description, not a generic list. Each one notes what the interviewer is really checking.
About your past
Tell me about a time you noticed a safety problem at work, like a spill or a broken light. What did you do?
What they are checking: Whether they report hazards and follow safe work practices without being told.
Tell me about a past job where you showed you were dependable. What would your old supervisor say about your attendance?
What they are checking: The posting asks for a good demonstrated work record, so they want proof of reliability.
What do you do if you finish your assigned areas early?
What they are checking: Initiative and work ethic when no one is checking.
What would you do
You come to a lab room with a sign or a container you don't recognize. What do you do?
What they are checking: Whether they stop and ask instead of touching unknown materials, which matters at a research lab.
It snows overnight and the building steps and sidewalks need clearing before people arrive. How do you plan your morning?
What they are checking: Whether they can reorder their work around urgent safety tasks and still finish their regular route.
Your foreman gives you an extra task, like moving furniture for a meeting, while you're halfway through your route. How do you handle it?
What they are checking: Flexibility with other duties as assigned while still keeping track of unfinished work.
About the work
Walk me through how you strip, seal and wax a hallway floor.
What they are checking: Whether they really know the floor care steps listed in the posting and the order they go in.
What industrial cleaning machines have you used, like scrubbers, buffers or pick up machines? How do you clean and care for them after a shift?
What they are checking: Hands-on equipment experience and whether they take care of shared machines.
How do you clean and sanitize a washroom so it's actually safe, not just looking clean?
What they are checking: Understanding of proper sanitizing, contact time and restocking, not just surface wiping.
How do you work safely on a ladder when changing a light bulb or cleaning a high fixture?
What they are checking: Basic ladder safety, since falls are one of the real risks of this job.
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Practice this out loudThe full job description
As published by Argonne National Laboratory.
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