Sr. Mechanical Development Engineer

At JetCool a Flex company were 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 whats possible and tackling complex challenges.

A career at JetCool offers the opportunity to make a real impact by helping build smarter more sustainable data were not just advancing technology were 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 were looking to add a Mechanical Development engineer located in Littleton MA.

Reporting to the Product Manager the Mechanical Development engineer The Sr. Mechanical Design Engineer will own the design analysis validation and refinement of mechanical components and assemblies that enable reliable high efficiency liquid cooling. They will work closely with Thermal Electrical Product Development Manufacturing and Quality teams to take products from concept through launch and into scalable production.

What a typical day looks like:

Mechanical Design & Development

• Own mechanical design for liquid cooling components including cold plates manifolds quick-disconnects tubing assemblies housings and chassis interfaces.
• Create and manage detailed CAD models 2D drawings GD&T and tolerance stack-ups to ensure robust manufacturable designs.
• Select materials and finishes to address corrosion galvanic compatibility cleanliness pressure containment and long-term durability in liquid cooling environments.
• Drive sealing strategies using O-rings gaskets welds brazes and adhesives matched to coolant chemistry and operating conditions.

Engineering Analysis

• Perform engineering calculations and simulations related to mechanical stress thermal expansion fatigue vibration flow/pressure and structural integrity.
• Collaborate with thermal engineers to optimize mechanical features influencing flow distribution pressure drop fin/channel geometry and heat transfer efficiency.
• Conduct DFM reviews with suppliers to align machining brazing and fabrication methods with design requirements.

Prototyping & Validation

• Build and iterate on prototypes to evaluate fit finish assembly and performance.
• Develop mechanical validation plans for pressure tests leak testing burst testing vibration/shock environmental exposure thermal cycling and dimensional inspection.
• Design test fixtures and support automated data collection where needed.
• Lead root cause analysis for failures (e.g. leaks deformation material incompatibility) and implement corrective design changes.

Manufacturing & Supplier Engagement

• Collaborate with manufacturing engineering and suppliers on fabrication machining brazing plating and sealing processes.
• Define critical-to-quality (CTQ) characteristics and participate in supplier qualification.
• Review and approve tooling control plans and inspection criteria for new mechanical parts.
• Support build events (EVT/DVT/PVT) and ensure mechanical components meet functionality quality and reliability targets.

CrossFunctional Collaboration

• Work with Program Management and Product Development to translate product requirements into mechanical specifications.
• Partner with Thermal and Electrical teams to ensure system-level integration of cooling hardware with processors boards and rack infrastructure.
• Provide input to serviceability reliability manufacturability and cost trade-off discussions.
• Support customer evaluations pilot deployments and field feedback analysis.

The experience were looking to add to our team:

• BS/MS in Mechanical Engineering or equivalent experience.
• 7 years developing complex mechanical components or assemblies for electro mechanical systems; experience with liquid cooling or fluid systems strongly preferred.
• Strong proficiency with CAD (SolidWorks Creo NX) drawing generation and GD&T (ASME Y14.5).
• Experience designing for precision machining brazing plating elastomer sealing and pressure rated components.
• Hands-on experience with pressure/leak testing dimensional inspection materials evaluation and mechanical validation testing.
• Familiarity with materials (copper aluminum stainless steel polymers elastomers) and their behavior in liquid coolant environments.
• Strong fundamental technical expertise in mechanical design and structural evaluation.
• Strong working knowledge of fluid dynamics and heat transfer principles.
• Excellent communication skills and ability to lead technical decisions across teams.

BO18

What youll 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

Is Sponsorship Available

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. Were happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email and well 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).