Principal Calibration Engineer
Posted Aug 24, 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 had to develop a new software strategy for something like shifting, starting, or transient control. What was the problem and how did you approach it?
What they are checking: depth of hands-on experience defining control strategies, not just tuning existing ones
Describe a test plan you built that required pulling in people from several different functions. How did you keep it on track when priorities conflicted?
What they are checking: ability to lead cross-functional test execution, a core listed responsibility
Tell me about a time you used DFSS or a similar root-cause methodology to chase down a failure. What made you confident you'd found the actual root cause and not just a symptom?
What they are checking: rigor and discipline in failure analysis versus guesswork fixes
What's an internal process, tool, or calibration strategy you personally created or overhauled, and how did you measure that it actually made things faster or more robust?
What they are checking: evidence of the process-improvement mandate this principal-level role expects
What would you do
Say you're mid-calibration and emissions data on the dyno doesn't match what your 1D simulation predicted. How do you figure out whether the model, the test setup, or the actual hardware is wrong?
What they are checking: systematic troubleshooting instinct across simulation and physical test domains
A field issue comes in that looks like it could be calibration, could be a supplier part, or could be a manufacturing variance. How do you sort out where the problem actually lives?
What they are checking: cross-functional diagnostic thinking and ability to advise teams outside calibration
You're mentoring a newer engineer who's confident in their calibration approach but you think they're missing something important. How do you handle that conversation?
What they are checking: ability to guide and train junior staff without shutting them down, per the stated responsibility
This role expects 8 to 10 weeks of travel a year, much of it likely tied to on-water and dyno testing. What's your experience with that kind of travel-heavy test cadence, and how do you keep a project moving when you're not in the building?
What they are checking: realistic expectations about travel demands and remote project management skills
About the work
Walk me through how you'd take a new engine family from dynamometer base calibration through to on-water drivability testing. What's the sequence and what are you watching for at each stage?
What they are checking: whether the candidate actually owns the full calibration lifecycle rather than one narrow slice of it
How have you used MATLAB or Python in your calibration work, and what kind of analysis were you actually building versus just running canned scripts someone else wrote?
What they are checking: real coding depth versus surface familiarity with the tools
Have you worked with Simulink for modeling engine or control systems? Tell me about a model you built or maintained and what decisions it drove.
What they are checking: whether Simulink experience is substantive enough to match the preferred qualification
Have you set up a Design of Experiments for calibration work, and what did the regression analysis end up telling you that changed your approach?
What they are checking: real statistical rigor versus just running sweeps and eyeballing results
Tell me about a DAQ setup you had to build or troubleshoot from scratch. What went wrong and how did you find it?
What they are checking: hands-on instrumentation competence, not just relying on someone else's rig
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Practice this out loudThe full job description
As published by Mercury Marine.