Principal Research Scientist I Eng
Posted Aug 5, 2026 · We last checked this listing on Oct 2, 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
You would function as a principal investigator generating original technical ideas and development strategies. Tell me about a technical approach you originated that was adopted.
What they are checking: Original contribution, not just problem solving.
You mentor and supervise a small team. How do you develop a scientist whose judgment you do not yet trust?
What they are checking: Developing judgment rather than skills.
This is a Principal Research Scientist I seat at North Chicago overseeing external drug substance manufacturing. How much travel would you expect, and what would you want to know about the partner network?
What they are checking: That they ask about the practical shape of a role the posting describes only loosely.
What would you do
This role provides technical oversight for external manufacturing partners producing drug substance and intermediates. How do you build technical confidence in a site you do not run?
What they are checking: Oversight at arm's length, which is the whole job.
An external partner reports a deviation on a batch. Walk me through your first day on it.
What they are checking: Response when the facts are at someone else's site.
A partner wants to change a supplier or a process step to reduce their cost. How do you evaluate it?
What they are checking: Assessing a change that benefits the partner and may risk the product.
About the work
How do you tell whether a partner's process problem is a process issue or an execution issue?
What they are checking: Diagnosis across the boundary between science and operations.
You would anticipate and critically evaluate scientific or regulatory advances and competitive threats. What change in external manufacturing should this industry be watching?
What they are checking: Outward-looking judgment appropriate to a principal scientist.
You would be primary author of regulatory documents. How does writing for a regulator differ from writing for a journal?
What they are checking: Range across the two kinds of technical writing the posting names.
How do you decide a process is ready to transfer to an external partner?
What they are checking: Transfer readiness, where being wrong costs months.
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As published by AbbVie.