Mechanical Engineer Space Instrumentation

Location: Sassenheim

As the Mechanical Engineer at cosine you design and realise precision mechanical assemblies that enable cutting‑edge space instrumentation. You translate concepts into robust 3D models and manufacturable designs, ensuring flawless assembly in cleanroom environments. Your work directly contributes to systems that operate in extreme conditions and deliver trusted data for space exploration.
Responsibilities   Create detailed 3D CAD models and assemblies optimised for manufacturing and assembly
Develop mechanical designs for cleanroom environments, ensuring precision, repeatability, and contamination control
Optimize designs for performance, manufacturability, and cost efficiency
Collaborate with multidisciplinary teams to move from concept to validated hardware
Support assembly and integration of high-precision components and systems
Contribute to Silicon Pore Optics assembly process development
Perform and support vibration and shock testing
Work with coordinate measurement machines for inspection and validation
Improve assembly processes and tooling to increase quality and efficiency
Qualifications   Bachelor's or Master's degree in Mechanical Engineering or a related field
5 to 10 years of relevant experience in a high-tech or precision engineering environment
Hands‑on experience with 3D CAD tools, preferably Solid Works or similar
Knowledge of GD&T principles and tolerancing best practices
Experience applying design for manufacturing and assembly principles
Experience in opto‑mechanical system design
Affinity with cleanroom environments and precision assembly workflows
Knowledge of materials, manufacturing techniques, and high‑precision tolerances

Experience with finite element analysis, preferably Abaqus, is a plus

Experience with Python or similar scripting tools is a plus
Proactive, detail‑oriented mindset with a strong drive to solve practical engineering challenges
Strong command of the English language, both written and spoken
Benefits   27 days of annual leave (based on full‑time employment)
Annual bonus based on personal and company performance
Hybrid working options, including the possibility to work partially from home
Company bicycle‑and fitness plan
A personal development budget
Initial one‑year contract, with the aim of long‑term collaboration
At cosine, we highly value our employees, and we will support your professional and personal development.
Founded in 1998, cosine is a world‑leading developer of space instrumentation and measurement systems, making the invisible measurable and the complex actionable. Its expertise spans High‑Energy Optics, including optics developed for ESA's future New Athena X‑ray observatory, as well as remote sensing solutions for Earth Observation and planetary science. With over 25 years of experience and advanced cleanroom and assembly facilities across the Netherlands, Germany, and Italy, cosine brings deep scientific and engineering expertise to some of the most demanding missions in space and on Earth.

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.
cosine is committed to providing an inclusive and equal opportunities work environment where everyone can thrive. As a proud member of the Women in Aerospace community, we recognise the importance of diversity, inclusion, and equal opportunity in the workplace.

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