# Plastic Molding Engineering Co-Op - Spring 2027 at Flex - Company: Flex - Location: Libertyville, IL - Type: Internship ยท Internship - Posted: 2026-09-19 - Apply: https://flextronics.wd1.myworkdayjobs.com/careers/job/USA-IL-Libertyville/Plastic-Molding-Engineering-Co-Op---Spring-2027_WD229696 - Page: https://newgrad.ai/jobs/plastic-molding-engineering-co-op-spring-2027-9c3935df ## Summary by newgrad.ai What you'll do: - Assist with injection mold trials and process window development for medical components - Support startup optimization, parameter validation, and defect analysis activities - Perform short-shot and imbalance studies on molding processes - Help with IQ/OQ/PQ documentation and mold performance assessments What they're looking for: - Currently enrolled student pursuing BS/MS in Plastics, Polymer, Mechanical Engineering, or Materials Science - Understanding of injection molding fundamentals and process validation in regulated environments - Experience with defect and root cause analysis - Ability to read mechanical drawings and strong documentation skills Pay and perks: - $27.50 - $44.50 hourly - 40 hours/week in-person position, Spring 2027 - Minimum 3.0 GPA required ## Posting 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 a Plastic Molding Engineering Co-Op located in our Libertyville, IL site. Reporting to Process & Automation Engineering Team, the 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 MS/BS 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 Spring 2027 co-op assignment - Currently enrolled in accredited university - 3.0 GPA min Application Deadline: 09-25-2026 Job Posting Start Date: 09-18-2026 Pay Range: $27.50 - $44.50 Hourly Job Category: Intern 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). From Flex's public posting, laid out for reading by newgrad.ai with the wording unchanged. Check the original before you apply. --- More new-grad and intern roles: https://newgrad.ai/llms.txt