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Mechanical Development Engineer Jobs (NOW HIRING)

Flex

Mechanical Development Engineer

Littleton, MA · On-site

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 ...

Gates

Mechanical Development Engineer

Rochester Hills, MI · On-site

$92K - $101K/yr

The Mechanical Development Engineer - E-Mobility Systems is responsible for the design, development, and validation of mechanical systems for electric mobility products. This role focuses on electric ...

Flex

Sr. Mechanical Development Engineer

Littleton, MA · On-site

$108K - $142K/yr

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 ...

Flex Ltd.

Sr. Mechanical Development Engineer

Littleton, MA · On-site

$108K - $142K/yr

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 ...

INNIO

Lead Mechanical Development Engineer

Waukesha, WI

$110K - $133K/yr

The Lead Mechanical Development Engineer will lead the primary technology "rapid response" interface to sourcing and quality to qualify components through PPAP (Production Part Approval Process ...

Innio

Lead Mechanical Development Engineer

Waukesha, WI

$110K - $133K/yr

The Lead Mechanical Development Engineer will lead the primary technology "rapid response" interface to sourcing and quality to qualify components through PPAP (Production Part Approval Process ...

INNIO

Lead Mechanical Development Engineer

Waukesha, WI

$110K - $133K/yr

The Lead Mechanical Development Engineer will lead the primary technology "rapid response" interface to sourcing and quality to qualify components through PPAP (Production Part Approval Process ...

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Mechanical Development Engineer information

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$72K

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How much do mechanical development engineer jobs pay per year?

As of Jun 5, 2026, the average yearly pay for mechanical development engineer in the United States is $112,200.00, according to ZipRecruiter salary data. Most workers in this role earn between $102,000.00 and $126,500.00 per year, depending on experience, location, and employer.

What are some common challenges Mechanical Development Engineers face when transitioning prototypes to mass production?

Mechanical Development Engineers often encounter challenges when moving a prototype into large-scale manufacturing, such as ensuring that the design can be produced cost-effectively, maintaining product quality, and adhering to tight schedules. Adjustments may be required to meet manufacturing constraints, supply chain limitations, or regulatory standards. Collaboration with cross-functional teams, including manufacturing, quality assurance, and supply chain, is crucial to address these issues efficiently and achieve a successful product launch.

What are Mechanical Development Engineers?

Mechanical Development Engineers are professionals who design, develop, and test mechanical devices and systems. They work on creating new products or improving existing ones by applying principles of engineering, physics, and material science. Their responsibilities often include prototyping, analyzing product performance, and collaborating with other engineers to ensure that products meet required specifications and standards. Mechanical Development Engineers play a crucial role in industries such as automotive, aerospace, manufacturing, and consumer goods. Their work helps bring innovative mechanical solutions to market efficiently and safely.

What is the difference between Mechanical Development Engineer vs Mechanical Design Engineer?

AspectMechanical Development EngineerMechanical Design Engineer
Primary FocusDeveloping and testing new mechanical products and prototypesCreating detailed designs and specifications for mechanical components
Work EnvironmentR&D labs, prototyping workshopsDesign offices, CAD environments
Required SkillsPrototyping, testing, material selectionCAD, technical drawing, design analysis
Common Industry UsageProduct innovation, research projectsManufacturing, product development

While both roles involve mechanical engineering expertise, Mechanical Development Engineers focus on creating and testing new products, whereas Mechanical Design Engineers concentrate on designing detailed parts and assemblies. The roles often overlap but differ mainly in their emphasis on development versus detailed design tasks.

What are the key skills and qualifications needed to thrive as a Mechanical Development Engineer, and why are they important?

To thrive as a Mechanical Development Engineer, you need strong skills in mechanical design, analysis, and problem-solving, typically supported by a degree in mechanical engineering or a related field. Proficiency with CAD software (such as SolidWorks or AutoCAD), simulation tools (like ANSYS), and familiarity with manufacturing processes are commonly required. Excellent teamwork, communication, and project management skills help you effectively collaborate and drive projects forward. These competencies ensure the development of reliable, innovative products that meet performance, quality, and timeline expectations.
More about Mechanical Development Engineer jobs
What cities are hiring for Mechanical Development Engineer jobs? Cities with the most Mechanical Development Engineer job openings:
What states have the most Mechanical Development Engineer jobs? States with the most job openings for Mechanical Development Engineer jobs include:
What are popular job titles related to Mechanical Development Engineer jobs? For Mechanical Development Engineer jobs, the most frequently searched job titles are:
Mechanical Development Engineer jobs near you
Infographic showing various Mechanical Development Engineer job openings in the United States as of May 2026, with employment types broken down into 100% Full Time. Highlights an 86% Physical, 5% Hybrid, and 9% Remote job distribution, with an average salary of $112,200 per year, or $53.9 per hour.
Mechanical Development Engineer

Mechanical Development Engineer

JetCool Technologies, Inc.

Littleton, MA • On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 10 days ago

Job description

Job Posting Start Date 04-10-2026 Job Posting End Date 06-26-2026
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 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.

Cross-Functional 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 we're looking to add to our team:
  • BS/MS in Mechanical Engineering or equivalent experience.
  • 5+ 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 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

Pay Range (Applicable to Massachusetts)
$106,500.00 USD - $146,500.00 USD Annual
Job Category
Production 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).

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