Job Description

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01st October, 2026 n

Our client is a growing engineering and technology company developing advanced systems for challenging and high-performance environments.
n Their multidisciplinary team brings together engineers, designers, and technical specialists to develop cutting-edge products from concept through to testing and deployment.
n They operate in a fast-paced environment where engineers have the opportunity to take ownership, work across disciplines, and contribute directly to the development of new technology.
n You'll have the opportunity to work on challenging engineering projects, develop your technical skills, and see your work progress from analysis and design through to testing and real-world application.
n Working closely with engineers across mechanical, electrical, systems, manufacturing, and test functions, you will contribute throughout the product development lifecycle — from early design and analysis through to testing and validation.
n Key Responsibilities:

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- Develop, run, and maintain thermal models for systems, subsystems, and components.
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- Perform thermal analysis across a range of operating and environmental conditions.
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- Define thermal cases and assumptions that support engineering and design decisions.
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- Support the design and sizing of active and passive thermal control solutions.
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- Perform first-principles calculations, hand calculations, and first-order analysis to validate results.
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- Conduct thermal trade studies considering performance, mass, power, cost, manufacturability, and operational requirements.
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- Support thermal testing and validation activities and correlate analysis with test results.
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- Prepare technical reports, analysis documentation, design notes, and review materials.
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- Work closely with multidisciplinary engineering teams to resolve thermal issues and support system-level decisions.
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- Develop and improve thermal analysis tools, models, databases, and post-processing workflows.
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- Contribute to continuous improvement of engineering methods, processes, and tools.
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About You:n
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- A hands-on and practical engineering mindset.
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- Strong analytical and problem-solving skills.
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- An ability to turn analysis and simulation results into practical engineering solutions.
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- A collaborative approach and confidence working across multiple engineering disciplines.
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- The ability to work independently, take ownership, and make decisions in a fast-moving environment.
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- A willingness to learn and work across areas outside your immediate technical discipline.
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Proven Experience: nn
- Bachelor's degree or higher in Mechanical, Aerospace, Space Systems, or a related engineering discipline.
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- 2+ years of experience in thermal analysis and/or thermal design.
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- Hands-on experience developing and running thermal models using an industry-standard tool such as Thermal Desktop, Systema/Thermica, ESATAN-TMS, NX Space Systems Thermal, or equivalent.
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- Understanding of thermal analysis principles and the environmental factors that influence thermal performance.
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- Ability to perform first-principles calculations and independently validate model results.
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- Understanding of passive and active thermal control methods, including selection, sizing, and integration considerations.
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- Strong systems-thinking and multidisciplinary engineering skills.
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Desirable Experience:n
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- Familiarity with relevant engineering standards such as ECSS, NASA, or MIL-STD.
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- Experience with thermal testing and test correlation.
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- Experience translating operating modes, mission profiles, or system requirements into thermal analysis inputs.
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- Experience with materials, coatings, radiation, contamination, outgassing, or other environmental considerations.
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- Experience with fluids and/or propulsion systems.
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- Experience using Python for analysis, data processing, automation, or reporting.
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- Understanding of systems engineering, requirements management, verification, and validation.
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- Experience working in a start-up, New-Space, or fast-paced product development environment.
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You must have working rights in Australia to be eligible for this position.n
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nIf you think this opportunity is right for you, please click apply or contact Cali for a confidential discussion at or email at n
nYou can find out more about Codematix by visiting n

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📌 Spacecraft Thermal Engineer (Sydney)
🏢 Codematix
📍 Sydney