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# Design engineers

- **Company:** Antares, LLC
- **Location:** Torrance, CA, United States
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Computer-Aided Design, Computational Fluid Dynamics, Computer Networks, Python (Programming Language), MATLAB, Test Data, Siemens NX, Scripting, Safety Critical Systems, Model Validation, Vba Programming Language, Star CCM+
- **Published:** October 27, 2026
- **Apply:** https://startup.jobs/senior-thermal-fluids-analyst-antares-10566596

## About the Role

* Bachelor's in Mechanical or Aerospace Engineering or similar technical discipline
 * 5+ years' experience performing thermal-fluid analysis
 * Experience building and running CFD models using commercial codes such as Fluent, CFX, and Star-CCM+, including conjugate heat transfer models and compressible equations of state
 * Experience using Computer Aided Design (CAD) software for design modification and model defeaturing (Siemens NX or similar)
 * Experience in Python, MatLab, VBA, or other scripting language to build and maintain tools and calculators

Preferred Skills & Experience:

 * Master's in Mechanical or Aerospace Engineering or similar technical discipline
 * Familiarity with 1-D fluid network tools such as Flownex, Sinda-Fluint, or RELAP5
 * Participation in regulatory qualification or certification programs for safety-critical systems in the aerospace or nuclear industry
 * Understanding and experience of implementing numerical methods to solve fluid-dynamic and thermodynamic systems
 * Experience working with multiphase fluid & heat transport systems (Heat Pipes, Rankine Cycle Engines, Saturated Cryogenic Storage)
 * Familiar with ASME BPVC Section III Div 5
 * Experience building and running Finite Element Analysis (FEA) models
 * Comfortable in a fast-paced environment with rapid design iteration loops

Additional Requirements:

 * Ability to work long hours and weekends as necessary to support critical milestones

## Description

As an Analyst at Antares, your primary responsibility will be to build and run thermal-fluid models of components and subsystems throughout the reactor core and power conversion system to ensure our designs meet thermal, mechanical, operational, and performance requirements in the extreme environments of our R1 micro-reactor. Design engineers will rely on your modeling and technical expertise for iterative design feedback and optimization, while adhering to DFM (design for manufacturing) best practices and maintaining a rapid pace of development. Antares aims to maintain close collaboration between testing and analysis teams; to this end, you may often be asked to provide technical support before, during, and after test campaigns. This may include cooperative planning of testing goals, instrumentation requests, root cause analysis after failures, post-test data review, and model validation/anchoring.

Roles and Responsibilities:

 * Assess subcomponent designs for pressure drop, heat transfer capabilities, and other performance characteristics using a combination of hand-calcs, in-house tools, and CFD
 * Collaborate with designers and responsible engineers to provide guidance on initial sizing, material selection, and design feedback based on analytical results
 * Compile detailed documentation of analytical results and communicate key results, assumptions, and limitations to stakeholders throughout the company and external customers
 * Provide support to test engineers in the form of collaborative test design, instrumentation selection, and data review to ensure test campaigns provide the necessary data to validate our models
 * Develop internal tools and calculators to enable other engineers to quickly and independently perform analytical assessments of their designs without the need for detailed finite element models
 * Provide technical mentorship and guidance to other engineers and across teams