Jobs › Flex

Process Engineer

Flex · Buffalo Grove, IL · Full time

Posted Sep 17, 2026 · We last checked this listing on Oct 6, 2026

Apply at Flex

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 high-speed automated equipment you've supported. What broke most often and how did you fix it?

What they are checking: Whether they have real hands-on troubleshooting experience on fast automated lines, which the posting stresses.

Walk me through a root cause investigation you led on a manufacturing failure.

What they are checking: Whether they use a structured method and prove the cause, rather than stopping at the first likely answer.

Tell me about a time you changed a process and it didn't go as planned.

What they are checking: Whether they handle setbacks honestly and learn from them rather than blaming others.

What would you do

Scrap is climbing on one station and the operators say nothing has changed. What do you do?

What they are checking: Whether they gather evidence on the floor and respect operator input while still testing it.

How do you decide when to dig into a mechanical problem yourself and when to bring in maintenance?

What they are checking: Whether they can roll up their sleeves on repairs while knowing when to share the load.

How do you communicate a process change to operators on every shift?

What they are checking: Whether they make sure changes actually land on all shifts, since one missed shift undoes the work.

About the work

OEE on your line dropped this week. How do you find out where the loss is?

What they are checking: Whether they break OEE into availability, performance and quality to target the actual problem.

How do you set process parameters so they're robust, repeatable and reproducible?

What they are checking: Whether they use data and studies to set parameters instead of tuning until it seems to work.

How would you define the right manufacturing system for a new customer application?

What they are checking: Whether they can translate product and volume needs into a sensible process and equipment plan.

What statistical tools do you use, like SPC, capability studies or gauge R&R?

What they are checking: Whether they can measure process stability and capability, which backs up any claim of a robust process.

Practice this interview out loud.

Offer builds a real interview for this exact role at Flex from your resume and this job description, asks the questions one at a time, and tells you what landed. The first one is free.

Practice this out loud

The full job description

As published by Flex.

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 

 Summary: The Process Engineer will be based in Buffalo Grove, IL reporting to the Process Engineering Manager. The Process Engineer plans, directs, and coordinates manufacturing processes by providing technical support in the development, implementation and maintenance of manufacturing systems per project requirements. Responsibilities: • Define and implement manufacturing systems appropriate for customer applications. • Support manufacturing KPIs such as OEE, Yield, Scrap and Downtime. • Establish and improve robust, repeatable, and reproducible process parameters. • Capability to independently or together with other engineering stakeholders identify root causes of failures in the manufacturing process. • Advanced troubleshooting of complex mechanical issues with high-speed automated manufacturing equipment. • Provide equipment maintenance and repair support as required. • Understanding the manufacturing process, technologies, techniques, and the product. • Support creation and implementation of engineering change orders (ECOs). • Develop, implement, and take ownership of process control methodologies. • Participate in activities pertaining to cycle time and process improvements. • Implement statistical process analysis on new and existing products. • Develop and maintain process documentation. • Assist in the development of training and provide training to production personnel. • Define, Implement, and evaluate proposed design updates and processes. • Develop, evaluate, and improve manufacturing methods. • Create work instructions and coordinate training for facilities and production personnel. • Coordinate/participate in pFMEA of manufacturing processes • Apply statistical methods to estimate future manufacturing requirements and potential. Qualifications: • B.S. in Mechanical/Industrial/Manufacturing Engineering with a minimum of 6 years’ experience in related field. • Minimum 6 years of experience working in a medical manufacturing or other highly regulated manufacturing environment. • Industrial/Manufacturing Engineering experience working in high-volume assembly processes. • Knowledge of automated equipment systems and tools - robotics, vision, material handling/part feeding systems, conveyors, ultrasonic welding, foil sealing, HMI/PLC controls. • Travel required – 5% MF15 What you'll receive for the great work you provide: • Full range of medical, dental, and vision plans • Life Insurance • Short-term and Long-term Disability • Matching 401(k) Contributions • Vacation and Paid Sick Time • Tuition Reimbursement 
 Application Deadline: Applications for this job position will be accepted for at least five days following the job posting start date below and continuing until the end date below or until the position is filled. This posting may close sooner due to application volume. Job Posting Start Date 09-17-2026 Job Posting End Date 10-30-2026

 The base pay range for this position is provided below. The final base rate offered will be determined using job-related, non-discriminatory criteria, including but not limited to experience, qualifications, geographic location, education, external market data, and internal equity. $99,900.00 USD - $137,400.00 USD Annual Job Category Production Engineering 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).

Apply at Flex

More process engineer roles