Job Description

At JetCool, a Flex company, we’re at the forefront of liquid cooling innovation, delivering advanced solutions that empower our partners in AI and high-performance computing. United by a shared purpose, our teams are pushing the limits of what’s possible and tackling complex challenges.

A career at JetCool offers the opportunity to make a real impact by helping build smarter, more sustainable data centers. Together, we’re not just advancing technology — we’re redefining cooling standards to create a more sustainable tomorrow.

Job Summary

To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Jr. Mechanical Development Engineer located in Littleton, MA.

Reporting to the Product Manager the Jr. Mechanical Development Engineer will supports the design, prototyping, testing, and documentation of system-level liquid-cooling hardware. Working under senior technical direction, this early-career engineer gains broad exposure to mechanical design, system integration, testing, and production readiness.

What a typical day looks like:

• Create and modify SolidWorks parts, assemblies, drawings, and BOMs.
• Support the design of brackets, tubing routes, mounts, manifolds, enclosures, and test fixtures.
• Integrate pumps, radiators, hoses, fittings, sensors, and server hardware.
• Apply GD&T and perform tolerance analysis with senior review.
• Conduct SolidWorks FEA under appropriate technical guidance.
• Assemble, instrument, and test engineering prototypes.
• Support pressure, leak, flow, thermal, vibration, and endurance testing.
• Analyze data and document configurations, results, and design changes.
• Participate in troubleshooting, teardown, and failure analysis.
• Support engineering changes, work instructions, supplier activities, and production builds.

The experience we’re looking to add to our team:

• Bachelor’s degree in mechanical engineering or equivalent practical experience.
• Typically 0 to 3 years of relevant experience.
• Foundational proficiency in 3D CAD, preferably SolidWorks.
• Familiarity with engineering drawings, GD&T, tolerance analysis, FEA, materials, and manufacturing methods.
• Strong hands-on aptitude and interest in building and testing hardware.
• Internship, co-op, robotics, Formula SAE, aerospace, fluid-system, or similar project experience preferred.
• Exposure to PDM/PLM systems or liquid-cooling equipment is beneficial.
• Assigned designs and documentation are accurate and timely.
• Prototypes are assembled and tested safely.
• Results and design changes are clearly documented.
• The engineer progressively assumes larger, more independent assignments.

BO18

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 10-19-2026 Job Posting End Date 12-31-2026

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.

$70,500.00 USD - $97,000.00 USD Annual

Job Category

Design, Process & Technology Engineering

Is Sponsorship Available?

No

JetCool 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 JetCool, you must complete the application process first).