Molding Process Engineering Co-op

Flextronics

2 - 5 years

Illinois

Posted: 05/04/2026

Job Description

Job Posting Start Date 03-24-2026 Job Posting End Date 03-28-2026

Flex is the diversified manufacturing partner of choice that helps market-leading brands design, build and deliver innovative products that improve the world.

A career at Flex offers the opportunity to make a difference and invest in your growth in a respectful, inclusive, and collaborative environment. If you are excited about a role but don't meet every bullet point, we encourage you to apply and join us to create the extraordinary.

Job Summary

To support our extraordinary teams who build great products and contribute to our growth, this Summer, we’re looking to add a Molding Process Engineering Co-Op located in our Libertyville, IL site.

Reporting to Process & Automation Engineering Team, the Intern will support injection molding process development and validation activities for high-precision medical components, while collaborating and working alongside Engineers and cross-functional teams.

What a typical day looks like:

Assist in injection mold trials and process window development
Support startup optimization and parameter validation
Perform short-shot and imbalance studies
Support defect analysis and root cause investigations
Assist with IQ/OQ/PQ documentation
Support tooling PM and mold performance assessments
Attend team meetings to support project work as needed

Student qualities we’re seeking for this internship assignment:

Junior/Senior student pursuing Bachelors degree in Plastics Engineering, Polymer Engineering, Mechanical Engineering, or Materials Science major
Understanding of Injection Molding Process (injection molding fundamentals)
Basic process validation knowledge in highly regulated environments
Defect & root cause analysis experience
Understanding of mold tooling components and ability to read basic mechanical drawings
Strong documentation and communication skills
Previous manufacturing floor internship experience a plus!

Co-Op Program Requirements:

Ability to work 40 hours/week (in person) during the co-op assignment
Currently enrolled in 4-year accredited university
3.0 GPA

Pay Range (Applicable to Illinois)

$16.74 USD - $23.02 USD Hourly

Job Category

Intern

Relocation: Not eligible

Is Sponsorship Available?

No

Flex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We're happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email accessibility@flex.com and we'll discuss your specific situation and next steps (NOTE: this email does not accept or consider resumes or applications. This is only for disability assistance. To be considered for a position at Flex, you must complete the application process first).

About Company

Flex, formerly Flextronics, is a global leader in supply chain solutions and contract manufacturing. It provides end-to-end services, including design, engineering, and logistics for industries like electronics, automotive, and healthcare, with a commitment to innovation and sustainability.