Principal Thermal Mechanical Engineer

About the role

To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add a Principal Thermal Mechanical Engineer located in Littleton, MA.

Responsibilities

• Lead the architecture, design, analysis, and optimization of complex fluid and thermal systems—including pumps, fluids, tubing, heat exchangers, and associated components—for advanced computing and processing platforms.
• Own mechanical and fluid system deliverables from concept through production, ensuring designs meet performance, reliability, manufacturability, and compliance requirements.
• Serve as a technical partner to customers and external collaborators, supporting system-level integration of fluid solutions into broader product architectures.
• Drive simulation, analysis, and test efforts to validate fluid flow, pressure drop, thermal performance, and material compatibility across operating conditions.
• Develop, review, and approve engineering requirements, specifications, and technical documentation in accordance with applicable industry standards and regulatory expectations.
• Lead and influence design reviews, presenting technical tradeoffs, risks, and recommendations to cross-functional teams, customers, and senior stakeholders.
• Identify technical gaps and emerging challenges, advocate for targeted research and development, and lead exploratory efforts that build foundational knowledge and intellectual property.
• Establish and promote best practices in fluid system design, analysis, and documentation, contributing to a strong engineering culture and continuous improvement.
• Provide technical leadership, mentorship, and guidance to engineers across experience levels, supporting professional development and raising overall team capability.
• Contribute to new product innovation by evaluating emerging technologies, industry trends, and alternative architectures to drive differentiated fluid system solutions.
• Support the resolution of complex technical issues throughout the product lifecycle, including development, qualification, production, and field support as needed.

Requirements

• Minimum of 7+ years of experience designing and engineering fluid systems in data center thermal management and cooling, automotive, medical, or nuclear industries, including at least 3+ years of direct experience with Coolant Distribution Units (CDUs).
• Deep expertise in fluid dynamics, thermodynamics, and heat transfer, with strong application of first principles engineering.
• Proven track record of new product development in thermal or fluid systems, including concept development, performance analysis, validation testing, and experimental design.
• Strong analytical and problem-solving capabilities, with demonstrated ability to troubleshoot and optimize complex fluid systems across development and production phases.
• Demonstrated technical leadership within a structured product development environment, with clear ownership of mechanical design deliverables from concept through release.
• Experience leading and mentoring development teams, driving technical direction, coordinating cross-functional efforts, and ensuring alignment to product requirements and schedules.
• Accountability for product-level mechanical execution, including leading design reviews, resolving technical risks, and ensuring designs meet performance, reliability, manufacturability, and compliance requirements.
• Strong communication and technical documentation skills, with the ability to clearly communicate complex concepts to technical teams and senior stakeholders.

Qualifications

• Master's degree in Mechanical Engineering or related field.
• Professional Engineer (PE) license preferred.

Skills

• Fluid Dynamics
• THERMODYNAMICS
• Heat Transfer
• Design and Analysis
• Technical Leadership
• Mentorship
• Communication
• Technical Documentation

Benefits

• 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

Pay Range (Applicable to Massachusetts): $153,500.00 USD - $211,000.00 USD Annual

Schedule

N/A