Thermohydraulic Test Engineer

Mersenne Labs•Washington, DC

33d•Onsite

About The Position

The Prototype and Test Engineer is a high-responsibility, hands-on engineering role focused on the design, assembly, and testing of prototype hardware and systems. This position is critical to advancing reactor subsystem validation by converting design concepts into physical test configurations and executing structured test programs. The engineer will support cross-functional teams by ensuring mechanical integrity, test readiness, and traceability of results to design requirements. This role requires a strong understanding of design-for-testability, mechanical integration, and experimental methods in high-consequence environments.

Requirements

5 - 8 years of relevant experience in mechanical system prototyping, hardware development, and/or system-level testing
Proficiency in 3D CAD tools and technical drawing creation
Hands-on experience with instrumentation and data acquisition tools
Knowledge of thermal-fluid systems, mechanical assembly practices, and basic structural analysis
Demonstrated ability to work in a multidisciplinary, fast-paced development environment
B.S. degree in STEM field

Responsibilities

Support the design and integration of mechanical and instrumentation components for prototype systems, including thermal loops, test vessels, support structure, etc.
Develop 3D models, fabrication drawings, and bills of material to realize test hardware
Drive design-for-manufacturing and design-for-test outcomes
Interface with vendors and fabricators to support procurement and build activities
Assist in developing test plans and procedure to validate component and system-level performance
Select and integrate instrumentation, data acquisition systems, and control hardware
Participate in test setup, commissioning, and safe execution of thermal, pressure, or functional tests
Record, analyze, and interpret test data and contribute to technical reports and design updates
Ensure test configuration align with verification objectives and regulatory or safety requirements