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Open nowPosted 382 days ago

Thermohydraulic Test Engineer

mersenne-labs4 open roles

Pay
$125,000 – $175,000 a yearly
Where
Washington, DC
Work mode
On site
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Your applicationOpen nowThermohydraulic Test Engineermersenne-labs · Washington, DC

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The clock on this job

Early applications get read.

12.1% of postings close within 7 days. Measured by our own scanner across the market.

Share of postings closed within
  1. 2.1%1 day
  2. 4.5%3 days
  3. 12.1%7 days
  4. 19.1%14 days
  5. 35.6%30 days
  6. 52.7%60 days
This job: posted 382 days ago

The posting

Prototype and Test Engineer

Location: Northern Virginia

Overview

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.

What you Bring

  • 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

Prototype Design and Integration

  • 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

Test Planning and Execution

  • 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

Why This Role:

  • Work directly with team building breakthrough hardware at well-funded, seed-stage hardware startup
  • Own critical contributions from day one
  • Join a team that moves fast, thinks big, and builds real things

Competitive salary, benefits, and revenue share when a product realized from your idea gets commercialized. Let us know if you’d like a longer version with compensation, benefits, or more about the company.

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