Process Engineer I
Posted Aug 21, 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 process change you validated for a medical or aerospace customer. What did validation require?
What they are checking: Whether they understand that changes in regulated work need evidence and customer approval.
Tell me about a time you improved yield or cycle time. What were the numbers before and after?
What they are checking: Whether they deliver measurable improvements and can explain how they got them.
How do you train operators and technicians when you change a process?
What they are checking: Whether they make sure the floor understands changes so improvements actually hold.
What would you do
Solder paste defects are climbing on one SMT line. Walk me through how you would find the cause.
What they are checking: Whether they troubleshoot systematically across stencil, paste, printer and board instead of guessing.
How do you decide between fixing a process issue and asking the customer to change the design?
What they are checking: Whether they can judge where the root cause lives and push back on design when needed.
Production wants to run a new product before the process is fully proven. How do you handle it?
What they are checking: Whether they can balance schedule pressure against the risk of building bad product.
About the work
Which manufacturing processes have you owned, like SMT, reflow, wave solder or conformal coat?
What they are checking: Whether they have real process ownership in electronics manufacturing, not just general engineering.
How would you develop a reflow profile for a new board with a mix of large and small components?
What they are checking: Whether they understand thermal mass, paste requirements and how to verify a profile with data.
How have you used design of experiments or statistical process control to improve a process?
What they are checking: Whether they use data and statistics to set and hold process windows.
How do you write a PFMEA, and how do you keep it useful after the first draft?
What they are checking: Whether they treat risk analysis as a living tool that guides controls, not a one-time document.
Practice this interview out loud.
Offer builds a real interview for this exact role at Plexus from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.
Practice this out loudThe full job description
As published by Plexus.