Systems Engineer Sr - IT
Posted Sep 29, 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 the most complex infrastructure migration you've led. What broke, and how did you find out?
What they are checking: Whether they plan for failure and own what went wrong, rather than describing a migration where nothing surprising happened.
Describe a time you mentored a less experienced engineer through a hard technical problem instead of just fixing it yourself.
What they are checking: Whether a senior hire will grow the team's skills or become the single point of knowledge everyone depends on.
Tell me about a time you pushed back on a request from the business because the technical approach was risky.
What they are checking: Whether they can say no with reasons and offer an alternative, rather than quietly building something they know is fragile.
What would you do
A production line at another site calls at 2 a.m. saying their MES application is slow. You don't own that application. What do you do first?
What they are checking: Whether they triage calmly across ownership lines and gather evidence before escalating or guessing at a fix.
You're working with a team in another country on a shared rollout, and they keep missing handoffs. How do you handle it?
What they are checking: How they handle global collaboration across time zones without blame, which matters in a company spread across many regions.
How do you keep documentation and runbooks current when the team is busy and nobody enjoys writing them?
What they are checking: Whether they treat documentation as part of the work, since a global IT team depends on others being able to follow it.
About the work
Plexus runs manufacturing sites around the world. Walk me through how you'd design server and storage infrastructure so a factory floor keeps running when a WAN link to the main data center drops.
What they are checking: Whether they understand that plant systems need local resilience, because a line that stops waiting on a network costs real money.
How do you decide what to automate in a server environment and what to leave as a manual, documented step?
What they are checking: Judgment about where automation pays off versus where it adds fragile complexity that only one person understands.
Explain how you'd approach patching servers that support a regulated medical device production line where downtime and change control are both tightly limited.
What they are checking: Whether they can balance security patching with validated environments, where an untested change can create a compliance problem.
What's your approach to monitoring and alerting so the team hears about real problems without drowning in noise?
What they are checking: Whether they've tuned alerting in practice and understand that alert fatigue leads to missed outages.
Walk me through how you'd plan backup and disaster recovery for a site, including how you'd prove the restore actually works.
What they are checking: Whether they test restores rather than trusting backups, the difference between having a plan and having a working plan.
Practice this interview out loud.
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Practice this out loudThe full job description
As published by Plexus.