Senior Mechanical Design Engineer

Simplexity Product Development • North Reading, MA

2d • Onsite

About The Position

The Senior Mechanical Design Engineer works with teams to design subsystems for products, tools, and equipment, including robotics, mechanisms, and biotech instrumentation. The role requires strong command of mechanical engineering fundamentals and their application to simple, reliable designs, along with technical leadership experience and a background in product development consulting. The work is varied and project-specific, in a fast-paced environment described as casual and flexible.

Responsibilities include architecting, designing, and integrating complex mechanical systems; communicating concepts through block diagrams, rough CAD, schematics, and sketches; designing with custom, semi-custom, and off-the-shelf parts; and performing engineering analyses. The engineer manages 3D CAD assemblies and bills of materials, creates drawings to ASME Y14.5 GD&T standards, prototypes and tests designs, and iterates against specifications. The role also involves collaboration across disciplines, selection of manufacturing methods, prioritization and resolution of technical issues, and regular communication with clients and project management. The engineer coordinates with external partners and conducts or informs simulations as needed.

The job is based in the Boston area and initially requires onsite work at a Simplexity client facility in North Reading, Massachusetts. The company describes its work as product development engineering for technology companies, focused on simplifying design and production, reducing product cost, and improving reliability. It emphasizes collaborative teams, meaningful engineering work, technical growth, and a typical 40–45-hour work week with employee ownership of work-life balance.

Requirements

• Bachelor’s or master’s degree in Mechanical Engineering from an accredited four-year university.
• At least 10 years of relevant professional engineering experience.
• Proficiency in SolidWorks, highly preferred, or an equivalent CAD package.
• Thorough understanding of 2D drawings, preferably with strong ASME Y14.5 GD&T skills, and how drawings apply to design and manufacturing.
• Knowledge of manufacturing processes and design considerations, including injection molding, sheet metal, machining, and rapid prototyping.
• Knowledge of assembly and alignment methods, including screw joints, snap fits, dowel pins, and heat-staking.
• Ability to root-cause system-level defects.
• Experience designing and integrating complex systems with cross-functional teams, including electrical, firmware, software, and systems engineers.
• Strong organizational and analytical skills, attention to detail, and ability to plan and prioritize effectively.
• Ability to work independently with minimal supervision.
• Clear communication and detailed report-writing skills.
• Positive attitude and focus on client success.
• Ethical and honest conduct.

Nice To Haves

• Experience with mechatronics and electro-mechanical systems, including stepper and DC motors, solenoids, gear and belt drives, linear actuators, bearings, sensors, and electronics.
• Product development consulting experience with clients.
• Experience using a CAD PDM system to manage CAD files.
• Robotics, instrumentation, and test equipment design experience.
• Pneumatic and/or hydraulic system design experience.
• Medical device experience, including work within a medical quality system.
• Experience with Finite Element Analysis, Computational Fluid Dynamics, or another simulation package.

Responsibilities

• Architect, design, and integrate complex mechanical systems.
• Communicate design concepts using block diagrams, rough CAD, schematics, and sketches.
• Design solutions using custom, semi-custom, and off-the-shelf parts.
• Perform analytical studies applying engineering principles, including force and energy balances, structural calculations, mechanical vibration, tolerance analysis, and power transmission.
• Manage large 3D CAD assemblies.
• Generate and maintain an organized bill of materials.
• Create 2D drawings to ASME Y14.5 GD&T standards.
• Quickly prototype design concepts, test them against specifications, and iterate.
• Collaborate with engineers across disciplines.
• Select manufacturing methods for prototyping and production, and design components accordingly.
• Prioritize technical issues on designs and drive them to resolution.
• Communicate regularly with clients and project management about project status, issues, design decisions, and risks.
• Coordinate with external partners, such as industrial design and contract manufacturing firms.
• Work onsite at client facilities in the local area, initially at a client site in North Reading, Massachusetts.
• Conduct or inform simulations, such as structural FEA, thermal FEA, and CFD, as needed.

Benefits

• Medical, dental, and vision healthcare plan fully paid for employees and partially paid for dependents.
• 401(k) plan with company match.
• Short- and long-term disability insurance, AD&D, and life insurance.
• Paid maternity/new parent leave.
• 11 paid holidays.
• Three weeks of paid time off per year, increasing after 2, 5, and 9 years of service.

What This Job Offers

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