Injection Molding Engineering Co-Op

Flex
Libertyville, Illinois, United StatesPosted Sep 9, 2026
Year-round

About the role

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, we’re looking to add an Injection Molding Engineering Co-Op located in our Libertyville, IL site. Reporting to Process & Automation Engineering Team, the part-time student 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 co-op assignment

Currently enrolled student pursuing 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 20 hours/week (in person) during the part-time co-op assignment Currently enrolled i

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