Senior Mechanical Engineer

Capybara Energy; Woburn (MA); On-site; USD 90,000 - 120,000; Full time

Benefits offered by this job

Equity

Company funded HSA

3 weeks paid time off

Sick pay & parental leave

10 paid holidays

Health and dental insurance

401(k) match

Advanced snacks

Job summary

Capybara Energy in the United States is seeking a Senior Mechanical Engineer to design and develop grid-scale energy storage hardware and ancillary systems from concept through manufacturing.

This hands-on role emphasizes product design, prototyping, and problem-solving. You will collaborate across disciplines and contribute to IP protection while guiding from prototyping to production. A strong background in manufacturability is required.

Qualifications

• Bachelor’s or Master’s degree in Mechanical Engineering or related field.
• 3+ years of experience in mechanical design and product development.
• Experience designing and launching a physical product (UL listed or outdoor rated preferred).
• Strong understanding of manufacturing principles and process optimization.
• Proficiency in CAD software, structural analysis, and DFM.
• Solid understanding of materials, manufacturing processes, and design for manufacturability.
• Strong technical, creative, and troubleshooting skills.
• Collaboration across disciplines is essential.

Responsibilities

• Design, develop, and refine mechanical components and assemblies for energy storage hardware.
• Collaborate with engineers and scientists to document and improve designs.
• Support the full product lifecycle from concept and prototyping to validation, testing, and production.
• Troubleshoot design and performance challenges with creativity and technical precision.
• Oversee fabrication, testing, and performance evaluation.
• Conduct FEA simulations, tolerance analyses, and material selection for optimized designs.
• Bring creative, practical solutions to complex engineering challenges and help protect IP.
• Participate in design, brainstorming, and problem-solving with the broader engineering team.
• Contribute to internal design standards, tools, and documentation processes.

Skills

Teamwork

Problem solving

Manufacturing collaboration

Communication

Education

Bachelor’s or Master’s in Mechanical Engineering

Tools

CAD software

Finite Element Analysis

DFM/DFMA

Job description

Mechanical Engineer wanted for a groundbreaking journey to develop grid-scale energy storage technology. Average pay. Demanding hands-on work, intense challenges, relentless problem-solving. Failure possible. Honor and recognition if successful.

Pay:

$90,000.00 - $120,000.00 per year

Senior Mechanical Engineer - Product and system design

About the Role:

We’re looking for a rockstar Engineer to design and develop an energy storage technology and ancillary systems.

Please note that this position requires previous experience in direct involvement in the design and commercialization of a physical product.

This is a hands-on role, ideal for an engineer who enjoys product design, prototyping, and problem-solving. You’ll work closely with our team to bring innovative, real-world products from design to manufacturing.

Key Responsibilities:

• Design, develop, and refine mechanical components and assemblies for our energy storage hardware.
• Collaborate with engineers and scientists to document and improve designs.
• Support the full product lifecycle; from concept and prototyping to validation, testing, and production.
• Troubleshoot design and performance challenges with creativity and technical precision.
• Oversee fabrication, testing, and performance evaluation.
• Conduct FEA simulations, tolerance analyses, and material selection for optimized designs.
• Bring creative, practical solutions to complex engineering challenges and help protect key IP.
• Participate in design, brainstorming, and problem-solving with the broader engineering team.
• Contribute to internal design standards, tools, and documentation processes.

Qualifications:

• Bachelor’s or Master’s degree in Mechanical Engineering or related field.
• 3+ years of experience in mechanical design and product development.
• Demonstrated experience designing and launching a physical product (UL listed or outdoor rated preferred).
• Strong understanding of manufacturing principles and process optimization.
• Proficiency in CAD software, structural analysis, and DFM.
• Solid understanding of materials, manufacturing processes, and design for manufacturability.
• Strong technical, creative, and troubleshooting skills.
• This role requires close collaboration across disciplines, so teamwork and communication are essential.

Preferred Skills:

• Knowledge of electronics integration or mechatronics.
• Experience working in regulated or safety-critical environments.
• DFMA
• Experience coordinating with contract manufacturers or large-scale production partners.

Please check out our other job opportunities on our website, Capybara.Energy

What We Offer:

• Equity
• Company funded HSA
• 3 weeks paid time off
• Sick pay & parental leave
• 10 paid holidays
• Health and dental insurance
• 401(k) match
• Advanced snacks

U.S. citizenship or lawful permanent resident status is required due to federal contract requirements.