Thermo-Mechanical Engineer

About the role

As the Thermo-Mechanical Engineer at cosine you help shape the next generation of space-borne optical instruments that push the boundaries of Earth observation and planetary science. Working from our Italian team, you contribute to missions that will fly on satellites and asteroid explorers, where performance, precision, and reliability are critical for success in orbit. You join a small, international, high-level team with a start-up mindset, where engineering decisions directly influence hardware that will operate in the most demanding environment imaginable: space. From early design choices to final qualification testing, your work ensures that our instruments survive launch and perform flawlessly in orbit, enabling new scientific discoveries and commercial applications in the rapidly evolving New Space sector. In this role you will: Lead and contribute to the thermo-mechanical design of high-precision optical instruments for space applications Perform thermal and structural analyses to ensure performance under launch and orbital conditions Support the full development cycle from concept design through to assembly, integration, and qualification testing Collaborate closely with optical, mechanical, and system engineers in an international multidisciplinary team Contribute to solving complex engineering challenges in a fast-paced, project-driven environment We are looking for candidates with the following qualifications: A Master's degree in Mechanical Engineering, Aerospace Engineering, or a related field Experience in thermo-mechanical design and analysis, ideally within space, aerospace, or high-tech precision engineering Strong understanding of thermal and structural behavior of complex systems under extreme conditions Hands-on mindset with experience in hardware development, integration, and testing Ability to work effectively in small, international teams with a proactive and collaborative attitude Strong communication skills in English, both written and spoken At cosine, we highly value our employees, and we will support your professional and personal development. We also provide our employees with: A unique, international working environment at the intersection of physics and engineering The opportunity to deliver end-to-end solutions in autonomous project teams, in close collaboration with customers A competitive salary with an annual bonus based on individual and company performance 20 days of annual leave (based on full-time employment) 13 th month salary payment Hybrid working options, including the possibility to work partially from home A personal development budget cosine transforms high-stakes measurement challenges into scalable, real-world solutions. Founded in 1998 and headquartered in Sassenheim, the Netherlands, cosine is a world-leading developer of space instrumentation and measurement systems. Our expertise spans Silicon Pore Optics - including optics developed for ESA's NewAthena X-ray observatory - as well as hyperspectral remote sensing solutions for Earth Observation and planetary science. With over 25 years of experience and facilities across the Netherlands, Germany, and Italy, cosine brings deep scientific and engineering expertise to some of the most demanding missions in the space sector. What makes cosine a unique place to work is that your work goes end-to-end: from concept and design to building, testing, and delivering hardware that actually flies in space. You work in small, highly skilled teams where you have real ownership and impact, alongside experts in optics, physics, nanofabrication, and systems engineering.

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