Mechanical Development Engineer

Flex • Littleton, MA

5d

About The Position

JetCool, a Flex company, is hiring a Jr. Mechanical Development Engineer in Littleton, Massachusetts, to support the design, prototyping, testing, and documentation of system-level liquid-cooling hardware. Working under senior technical direction, this early-career engineer will gain broad exposure to mechanical design, system integration, testing, and production readiness. The position reports to the Product Manager.

The engineer will create and modify SolidWorks parts, assemblies, drawings, and bills of materials; help design mechanical components and fixtures; integrate liquid-cooling and server hardware; support analysis and testing; and document results and design changes. The role also supports troubleshooting, engineering changes, suppliers, work instructions, and production builds. Assigned designs and documentation are expected to be accurate and timely, prototypes assembled and tested safely, and the engineer to progressively take on more independent assignments.

Requirements

• 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.

Nice To Haves

• Internship, co-op, robotics, Formula SAE, aerospace, fluid-system, or similar project experience.
• Exposure to PDM/PLM systems or liquid-cooling equipment.

Responsibilities

• Create and modify SolidWorks parts, assemblies, drawings, and bills of materials.
• Support 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 test 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.
• Complete assigned designs and documentation accurately and on time, and progressively assume larger, more independent assignments.

Benefits

• Medical insurance plans
• Dental insurance plans
• Vision insurance plans
• Life insurance
• Short-term and long-term disability
• Matching 401(k) contributions
• Vacation and paid sick time
• Tuition reimbursement

What This Job Offers

• Job Type: Full-time
• Career Level: Entry Level