Intern - Functional Test (Summer 2027)
Posted Sep 1, 2026 · We last checked this listing on Oct 6, 2026
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 debugged something tricky, in school or on your own. What finally cracked it?
What they are checking: Whether they have patience and a method for hard problems, which is most of the job in test.
Tell me about a time you had to document your work so someone else could repeat it.
What they are checking: Whether they write clear records, since test results and procedures must be traceable for regulated customers.
What would you do
A board fails functional test. Walk me through how you'd start troubleshooting it.
What they are checking: Whether they work step by step from the failure data and measurements instead of swapping parts at random.
The test fixture says a unit fails, but you think the product might be fine. How would you tell which one is wrong?
What they are checking: Whether they suspect the test setup as well as the product, and use a known good unit to compare.
Production says test is the bottleneck. How would you look at speeding it up without weakening coverage?
What they are checking: Whether they can balance throughput against quality and find waste without cutting tests that catch real defects.
About the work
What's the difference between functional test and something like in-circuit test or visual inspection?
What they are checking: Whether they know functional test checks that the product actually works as designed, not just that parts are placed.
How comfortable are you with lab equipment like a multimeter, oscilloscope or power supply? Tell me how you've used them.
What they are checking: Whether they have real hands-on experience with the tools test engineers use every day on the floor.
What programming have you done, and could it be used to automate a test sequence?
What they are checking: Whether they can write or modify test scripts, since much functional test work is automating measurements and pass or fail checks.
Why does a false pass worry a test engineer more than a false fail?
What they are checking: Whether they understand a false pass ships a bad product to a customer, possibly a medical or aerospace one.
How do you stay safe working around powered electronics and test equipment?
What they are checking: Whether they take electrical safety and ESD precautions seriously rather than treating them as an afterthought.
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Practice this out loudThe full job description
As published by Plexus.