Sr Mechanical Engineer

flex; Littleton (MA); On-site; USD 101,000 - 140,000; Full time

Job summary

A leading company seeks a Mechanical Engineer to develop hardware systems. Responsibilities include creating manufacturable designs, analyzing thermal performance, and collaborating with vendors. Ideal candidates have a B.S. in Mechanical or Aerospace Engineering and experience in thermal engineering.

Benefits

Medical, Dental, and Vision Plans

Life Insurance

Short-term and Long-term Disability

Matching 401(k) Contributions

Vacation and Paid Sick Time

Tuition Reimbursement

Qualifications

• 0-3+ years of work experience in thermal and/or fluids engineering.
• Demonstrated ability with hands-on builds/projects.

Responsibilities

• Develop manufacturable mechanical designs using SOLIDWORKS CAD.
• Analyze design concepts for thermal performance.
• Assemble engineering drawings and procure parts.

Skills

Fluid Dynamics

Thermodynamics

Heat Transfer

Project Management

Education

Bachelor of Science (B.S.) in Mechanical or Aerospace Engineering

Tools

SOLIDWORKS CAD

Job description

Job Posting Start Date: 05-09-2025
Job Posting End Date: 05-30-2025

Flex 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

The position will be responsible for the development of hardware systems, starting with the development of concepts and taking these concepts through their tollgates all the way to a potential hand-off for production.

What a typical day looks like:

1. Develop manufacturable mechanical designs to achieve system interface and structural requirements using SOLIDWORKS CAD.
2. Apply first principles in fluid dynamics, thermodynamics, and heat transfer to analyze design concept thermal performance.
3. Apply analysis and simulation tools (e.g., thermal and structural FEA, CFD) for product development and refinement.
4. Implement in-house prototyping tools to generate, evaluate, and select concepts.
5. Assemble engineering drawings and engage with external vendors to procure parts and hardware.

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

• Bachelor of Science (B.S.) in mechanical or aerospace engineering and 0-3+ years of work experience, or a similar background, in thermal and/or fluids engineering.
• Ability to balance and prioritize multiple simultaneous projects.
• Excellent first principles knowledge in fluid dynamics, thermodynamics, and heat transfer.
• Comfortable interfacing with fabrication partners and suppliers to deliver high-quality parts on time.
• Demonstrated ability with hands-on builds/projects.
• Ability to work independently and on small teams.
• Proficiency in SOLIDWORKS CAD and drawing packages.

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): $101,200.00 USD - $139,100.00 USD annually.

Job Category: Design, Process & Technology Engineering

Is Sponsorship Available?

No

Flex is an Equal Opportunity Employer, and employment 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 are happy to provide reasonable accommodations for disabilities. Please email [e-mail] for assistance. (Note: this email is only for disability assistance; resumes or applications should be submitted through the regular process.)