Mechanical Engineer at Mithril Technologies in Somerville, MA

What You’ll Do

• Develop Mechanical Designs: Create and refine mechanical components, assemblies, enclosures, mounting structures and hardware packaging for radar systems and supporting equipment.

• Perform Thermal Analysis: Evaluate heat generation, temperature distributions, thermal paths and component operating limits to inform design decisions and ensure reliable operation.

• Develop CAD Models: Generate detailed 3D models, assemblies and engineering drawings using CAD tools such as SolidWorks, Creo or equivalent.

• Evaluate Design Tradeoffs: Assess mechanical configurations for thermal performance, structural integrity, manufacturability, weight, packaging and ease of integration.

• Design Thermal Management Solutions: Evaluate and implement heat sinks, conductive interfaces, thermal straps, radiative surfaces and other heat transfer approaches as appropriate.

• Analyze Heat Transfer: Apply conduction, convection and radiation principles to understand thermal behavior under relevant operating and environmental conditions.

• Design for Space Environments: Consider thermal management requirements across ground testing, launch and eventual space operation, including the effects of vacuum and changing thermal boundary conditions.

• Support Fabrication and Assembly: Work with manufacturing partners andsuppliers to translate designs into physical hardware, resolve fabrication challenges and refine designs for manufacturability.

• Integrate Mechanical and Electrical Systems: Collaborate with RF, electrical, and systems engineers to accommodate component placement, mounting interfaces, cable routing, access and system-level constraints.

• Validate Designs: Support prototype assembly, thermal testing, mechanical verification and troubleshooting. Compare test results with analytical predictions and refine designs as needed.

• Maintain Engineering Documentation: Produce drawings, bills of materials, design documentation and analysis reports to support development and integration.

• Iterate Rapidly: Incorporate analysis results and test feedback into improved designs as the system evolves.

What We’re Looking For

• Bachelor's or master's degree in Mechanical Engineering or a related engineering discipline.

• 2–4 years of relevant experience in mechanical design, thermal analysis, product development or hardware engineering.

• Proficiency with 3D CAD software, including the ability to develop detailed part models, assemblies and engineering drawings.

• Strong understanding of heat transfer fundamentals, including conduction, convection, radiation and thermal resistance.

• Ability to evaluate engineering designs using analytical calculations, simulations and sound engineering judgment.

• Understanding of mechanical design principles, material selection, tolerances and design for manufacturability.

• Experience translating engineering requirements into practical mechanical designs. • Strong problem-solving skills, attention to detail and the ability to communicate technical findings clearly.

• A hands-on approach to engineering, with an interest in taking designs from CAD and analysis through fabrication, assembly and testing.

• Ability to collaborate effectively across multiple engineering disciplines in a fast paced development environment.

• U.S. person: U.S. citizen or green card holder. Required for all candidates (ITAR).

• Clearable: Able to obtain a U.S. security clearance.

Bonus Points

• Experience with finite element analysis (FEA), computational fluid dynamics (CFD), or other engineering simulation methods.

• Familiarity with thermal analysis tools such as ANSYS Mechanical, ANSYS Fluent, SINDA/FLUINT, SolidWorks Simulation or equivalent.

• Experience designing thermal management solutions for electronics, RF hardware or high-power systems.

• Familiarity with thermal analysis in vacuum environments, including the transition from convection driven ground environments to conduction and radiation driven heat transfer in space.

• Understanding of radiative heat transfer, surface emissivity and absorptivity, and radiative coupling between surfaces.

• Exposure to spacecraft thermal design, thermal balance analysis, thermal cycling or thermal-vacuum testing.

• Familiarity with spacecraft environmental constraints, including launch loads, vibration and temperature extremes.

• Experience designing lightweight, compact or thermally constrained assemblies.

• Exposure to aerospace, space systems, defense electronics or other demanding hardware applications.

• Experience with machined components, sheet metal, additive manufacturing or other rapid prototyping methods.

Why Join Mithril?

• Make a Direct Impact: Your engineering decisions will influence the design and performance of the overall system.

• Own Meaningful Technical Challenges: Work across circuit design, RF systems analysis, and hardware integration rather than being confined to a single narrow function.

• Build What You Design: Take ideas from simulation and analysis into physical hardware and system demonstrations.

• Work Closely with Technical Leadership: Collaborate directly with the people shaping the company's technology and engineering roadmap.

• Grow With the Company: Help build a new engineering organization and expand your technical responsibilities as the team grows.