Senior Mechanical Engineer

Bren-Tronics Defense LLC; Commack (NY); On-site; USD 120,000 - 170,000; Full time

Job summary

EnerSys Advanced Systems, a Bren-Tronics division, seeks a Senior Mechanical Engineer to drive the design of high‑energy storage systems. You will lead mechanical development for batteries, chargers, and complex modules, emphasizing injection‑m molded and sheet‑metal components for reliability and manufacturability.

You’ll mentor engineers, collaborate with cross‑functional teams, and optimize production transitions from prototype to full scale. Strong SolidWorks skills required.

Qualifications

• Bachelor’s degree in Mechanical Engineering; Master’s preferred.
• 10+ years hands-on product development in engineering/production.
• Proficiency with SolidWorks.
• Experience in metal and plastic injection molding.
• Battery packaging experience a plus.
• Strong knowledge of mechanical engineering principles and materials.
• Experience mentoring engineering teams.
• Excellent communication and problem-solving skills.

Responsibilities

• Collaborate with management, electrical engineers, drafters, technicians, and production teams to design and develop new products.
• Use SolidWorks to design systems, assemblies, and components.
• Produce comprehensive drawings and schematics for mechanical systems within change-control processes.
• Source mechanical system components.
• Perform structural and thermal analyses on designs.
• Provide leadership and troubleshoot battery system prototypes to production.
• Facilitate smooth transition of new battery products from prototype to production.
• Engineer fixtures and aids for battery production to optimize processes and quality.
• Identify and resolve technical issues across the supply chain.
• Contribute to project proposals, ensuring technical accuracy and client alignment.
• Mentor junior engineers and support team development.

Skills

SolidWorks

Injection molding (metal & plastic)

Battery packaging experience

Mentoring engineers

Communication skills

Thermal/structural analysis

Education

Bachelor’s degree in Mechanical Engineering

Master’s degree preferred

Tools

SolidWorks

Job description

EnerSys Advanced Systems (EAS) is a specialized division of EnerSys—a global leader in stored energy solutions for industrial applications. EAS focuses on cutting‑edge energy solutions for the aerospace, defense, and medical industries. As we continue to grow, we’re looking for individuals who share a passion for these industries and want to be part of an innovative, dynamic team.

Certain positions at EnerSys Advanced Systems require access to information or technology that is subject to the International Traffic in Arms Regulations (ITAR) and other U.S. government security regulations. Candidates for these positions should be a “U.S. Person” under ITAR (U.S. citizen, lawful permanent resident, or a refugee/asylee) and/or otherwise comply with ITAR requirements for access rights to be considered for a position.

What We Offer:

• Generous Time Off – 3+ weeks of paid time off, including PTO and paid sick leave, plus 11 paid holidays
• Comprehensive Benefits – Medical, dental, and vision coverage for employees and dependents at a discounted rate
• Financial & Career Growth – Life insurance, short-term disability, educational reimbursement, flexible spending accounts, and an employee stock purchase plan
• 401(k) Matching – 100% match at a 6% contribution level
• Innovative Culture – We value excellence, teamwork, and long‑term relationships with stakeholders, colleagues, and customers. Through innovative technology and ongoing training, we invest in our employees’ skills and career development.

At EAS, we don’t just build batteries – we power systems and devices that protect not only individual citizens but communities across the world.

If you’re excited about working in an innovative, fast‑paced, high‑tech environment, where your contributions make a real impact, we’d love to hear from you!

As a Senior Mechanical Engineer at Bren-Tronics, part of EnerSys and a manufacturer of advanced portable power solutions, you will provide technical leadership while leading, organizing, and contributing to the design and development of batteries, chargers, and other complex energy storage systems. This role requires strong expertise in the design of injection‑molded and sheet‑metal components to support reliable, manufacturable solutions for demanding applications.

Essential Duties and Responsibilities

• Work closely with management, electrical engineers, drafters, technicians, and manufacturing personnel to design, and develop new products.
• Utilize SolidWorks to generate designs of systems, assemblies, and components.
• Generate comprehensive technical drawings and schematics for mechanical systems and components while working within the configuration control systems ensuring accuracy, consistency.
• Develop sources for mechanical system components.
• Perform structural and thermal analyses on designs.
• Provide expert leadership and troubleshooting for the construction and refinement of battery system prototypes to production.
• Facilitate the seamless transition of new battery products from the prototype stage to full‑scale production.
• Engineer specialized fixtures and assembly aids tailored for battery production, optimizing manufacturing processes and ensuring product quality.
• Identify and resolve technical issues within the supply chain.
• Engage in the creation and refinement of project proposals, ensuring technical accuracy, compliance with client requirements, and alignment with organizational goals.
• Mentor junior engineers and support team development.

Qualifications

• Bachelor’s degree in Mechanical Engineering, A Master’s degree is preferred.
• Minimum of 10 + years hands on experience developing products and working in engineering production department.
• Experience and high proficiency with SolidWorks.
• Must possess experience in metal and plastic injection molding.
• Battery packaging experience a plus.
• Strong knowledge of mechanical engineering principles, materials, and processes.
• Experience mentoring and developing engineering team.
• Excellent communication, problem-solving, and decision‑making skills.
• Strong Customer/Client focus, technical capacity and discretion.

EnerSys provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.

We use artificial intelligence to screen, assess and select applicants for open positions, including for the purposes of reviewing and ranking application materials and scoring answers to application questions. Accordingly, decisions about your application and eligibility for employment with EnerSys may be made based exclusively on the automated processing of the personal information that you submit in your application materials.