Jobs › Plexus

Intern - Mechanical Engineer (Summer 2027)

Plexus · Neenah, WI · $23.00–$27.00 an hour · Full time

Posted Sep 1, 2026 · We last checked this listing on Oct 6, 2026

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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 mechanical design project you worked on in school or on a team. What was your part?

What they are checking: Whether they have done hands-on design work and can explain their own contribution.

Tell me about a design that did not work the first time. What did you change?

What they are checking: Whether they learn from testing and iterate rather than defending a first idea.

How have you worked with electrical or software teammates on a shared project?

What they are checking: Whether they can collaborate across disciplines, which product design at Plexus requires.

What do you hope to learn during a fall co-op term, and how will you measure that you got it?

What they are checking: Whether they have clear goals and will own their own learning.

What would you do

Plexus builds things like surgical systems and aerospace hardware. How would designing for those differ from a consumer product?

What they are checking: Whether they appreciate the higher stakes and documentation needed in regulated industries.

You are given a task and you are not sure where to start. What do you do?

What they are checking: Whether they ask good questions and take initiative instead of waiting quietly.

About the work

What CAD software have you used, and how did you use it on a real project?

What they are checking: Whether they can model parts and assemblies well enough to contribute early.

How do tolerances on a drawing affect whether a part can actually be manufactured?

What they are checking: Whether they understand that design choices drive cost and difficulty on the shop floor.

Walk me through how you would design an enclosure that keeps electronics cool.

What they are checking: Whether they can reason about heat transfer and airflow from basic engineering principles.

How would you choose between machining, sheet metal or injection molding for a part?

What they are checking: Whether they understand basic manufacturing processes and how volume and cost drive the choice.

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.

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The full job description

As published by Plexus.

About us: At Plexus, our vision is to help create the products that build a better world. Driven by a passion for excellence, we partner with leading Aerospace/Defense, Healthcare/Life Sciences and Industrial companies to design, manufacture and service some of the world’s most transformative products, including advanced surgical systems, diagnostic instruments, healthcare imaging equipment, mission critical aerospace systems, and electric vehicle (EV) charging solutions. Visit Plexus.com to learn more about our unwavering commitment to our vision. When we invest in our people, we invest in building a better world. With a vision rooted in the wellbeing and inclusive engagement of our team members, our customers, their end users and our communities, people are the heart of what we do and who we are. It is our values that unite us and guide us in everything that we do, including how we operate, behave and interact to foster a workplace where every team member feels valued and empowered to contribute their best. Our values include: Growing our People, Building Belonging, Innovating Responsibly, Delivering Excellence and Creating Customer Success. As a team member, you will engage in impactful work through global collaboration and the use of emerging technologies, join an inclusive culture where every team member is valued and working toward a greater purpose, and be empowered to reach your full potential through various development programs designed to accelerate your growth. Plexus offers a comprehensive benefits package designed to support team members' wellbeing, including medical, dental, and vision insurance, paid time off, retirement savings, and opportunities for professional development. We also prioritize work-life balance and offer a variety of perks to enhance the team member experience. For more information, visit our US benefits website at usbenefits.plexus.com . Our commitment to pay range transparency fosters an equitable workplace, where everyone can feel valued. This is an internship position (Non-Exempt Salary); the hourly range is stated below. The rate offered within this range will be based upon the geographic location, work experience, education, licensure requirements and/or skill level. Hourly Rate: $23 - $27/hr. OVERVIEW Perform challenging and diverse product development efforts, providing mechanical engineering design services and support throughout all stages of the product development life cycle. RESPONSIBILITIES • Develop mechanical components and system concepts that satisfy the customer's requirements. • Create and modify 3D models and 2D drawings under the guidance of senior engineers, ensuring accuracy and adherence to design standards. • Assisting in the building and assembly of prototypes, including tasks like cutting, drilling, using a mill or lathe, and assembling components, while following safety procedures. • Performing simple tests on materials or prototypes, recording data accurately, and assisting in the organization and presentation of test results. • Complete preliminary analysis on tolerance stack ups, thermal or structural under the guidance of senior engineers, ensuring accuracy and adherence to design specifications. • Attending meetings, contributing ideas, and taking notes, while learning from experienced engineers and gaining exposure to the product development process. MINIMUM QUALIFICATIONS • Student working toward a Bachelor’s or Master’s degree in Mechanical Engineering for the entire duration of internship. PREFERRED QUALIFICATIONS • Minimum Sophomore or Junior level status • GPA: 3.0 or higher is preferred • Experience with Creo Parametric and/or SolidWorks is desired This document does not represent a contract of employment and is not intended to capture every possible assignment the incumbent could be asked to perform. We are pleased to provide reasonable accommodations to individuals with disabilities or special requirements. If you need an application accommodation, please contact us by email at GHQ.TA@plexus.com . Please include your contact information and clearly describe how we can help you. This email is for accommodation requests only and cannot be used to inquire about the status of applications. We are an Equal Opportunity Employer (EOE) and do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. Some offers of employment are contingent upon successfully passing a drug screen and/or background check.

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