Product Engineer
Posted Aug 27, 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 technical problem you solved in school, an internship or a job, and how you knew you'd really fixed it.
What they are checking: Whether they verify fixes with data, not just stop when the symptom goes away.
Tell me about a time you had to explain a technical issue to someone without an engineering background.
What they are checking: Whether they can communicate clearly with buyers, planners and customers who need answers, not jargon.
What would you do
A customer's drawing and bill of materials don't match. What do you do?
What they are checking: Whether they stop and get the customer to clarify, rather than picking one and building the wrong thing.
Production says your new work instruction is confusing. How do you respond?
What they are checking: Whether they take feedback from the floor seriously and fix the instruction, rather than blaming operators.
How do you handle an engineering change that arrives while product is already being built?
What they are checking: Whether they think about what's on the line and in stock, so mixed or wrong builds don't happen.
About the work
At a contract manufacturer, a product engineer sits between the customer and the factory. How would you describe that job in your own words?
What they are checking: Whether they understand they support someone else's design and make it buildable, rather than designing products themselves.
Walk me through how you'd troubleshoot a circuit board that fails functional test.
What they are checking: Whether they work logically from symptoms to cause, using schematics, test data and measurements.
How do you read a bill of materials and an assembly drawing to plan a build?
What they are checking: Whether they can work from customer documents accurately, which is the core of product engineering at an EMS company.
What do you know about design for manufacturability, and can you give an example of a design choice that makes assembly harder?
What they are checking: Whether they can spot designs that cause defects or slow builds, so they can raise them with customers.
Why do medical and aerospace customers care so much about documentation and change control?
What they are checking: Whether they understand that regulated products need traceable, approved changes because failures can hurt people.
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Practice this out loudThe full job description
As published by Plexus.