Principal Mechanical Engineer (Engineering)
Job Posting Start Date 08-27-2025 Job Posting End Date 10-31-2025Flex 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
We are seeking a Principal Mechanical Development Engineer to add to our team in Littleton, MA. The Principal Mechanical Design Engineer will be responsible for leading the mechanical design activity implementing innovative and cost-effective product solutions in order to support the organization from prototype development through full-scale production.
JetCool, a Flex company, has a mission to continuously innovate next-generation cooling solutions to enable the devices that fuel a more sustainable tomorrow. JetCool designs and delivers microconvective cooling® technology for high-power electronics, enabling our customers to achieve unprecedented performance and unrivaled sustainability improvements. Our technology creates a ripple effect, enabling the businesses we serve to become more sustainable, profitable, and efficient. Join us to be part of some of today's fastest growing industries, while having a positive impact on society through technology.
What a typical day looks like:
Define new mechanical product architecture, analyze performances and provide feasibility studies
Lead and execute the mechanical system, subsystem and part design of products from requirement specification up to transfer to manufacturing including fabrication, testing, verification and validation of engineering prototypes
Support the creation of product design documentation requirements
Work with mechanical engineers in design and development of miniaturized system
Be a technical lead closing the gap between Marketing team and Mechanical Design teams
Work within the project team adopting time and cost-effective solutions
Provide high quality technical reports supported by simulations and/or lab tests
Investigate new technologies and trends, assisting in generating production and technology roadmaps that support customer expectations with close relationship with vendors
Support actively customer base with design improvements that enhance manufacturability and assembly while minimizing costs
Promoter and coordinator of design reviews and DFx reviews
The experience we are looking to add to our team:
Bachelor's degree in Mechanical/Aerospace/Biomedical engineering
8+ years of experience in engineering with proven technical leadership
Previous experience in designing medical devices, handset devices or white goods is a plus
Use of CAD tool suite
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
Job Category
Design, Process & Technology EngineeringIs Sponsorship Available?
NoFlex 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).