We are looking for a creative, solution-oriented and result driven Mechanical Engineer to join our Mechanical Engineering team at cosine in Sassenheim, The Netherlands. cosine is known for over 25 years for its innovative solutions in measuring systems for space and planetary research. Being part of an R&D organisation means that you will be working on several R&D projects at one time, interface with our customers and come up with innovative solutions and engineering designs.
As Mechanical (Design & Verification) Engineer, you will engage in design and analysis processes, using the state of the art technologies and software. The ideal candidate will have experience with product design, ushering mechanical solutions from research and design for assembly, testing and implementation. Since most of our projects are space oriented, you produce concepts to the highest quality standards on time and in budget with safety as leading principle.
cosine designs and builds optical, electronic, mechanical, and software-driven systems that deliver precision, reliability, and long-term value. From satellites that monitor climate change to tools that explore other planets, our work powers missions that expand scientific discovery and strengthen infrastructure resilience.
We also believe in long-term responsibility. Our systems are built with longevity and adaptability. Knowledge is shared purposefully. Partnerships are built on trust. Whether we’re scaling a prototype to full production or reapplying solutions across markets, cosine works with intent and with vision.
You will collaborate with best-in-class scientists, engineers, and problem-solvers across disciplines, building instruments that help explore space, understand Earth, and unlock new knowledge. We don’t just offer jobs; we cultivate careers where specialists evolve into explorers. Every system you touch contributes to missions that expand human understanding, and every project develops capabilities you’ll carry throughout your career.

Responsibilities and tasks

• Design of mechanical components and modeling of assemblies;– Application of multiple materials, for example: plastics, silicon, and metals;– Ensure Design for Assembly;– Ensure quality, cost-effectiveness, procurement and timely delivery;– Collaborate to fully assembled, functional products.
• Assembly and testing of Silicon Pore Optics, which involves:– Detailed inspection with CMM (Coordinate Measurement Machine);– Laser Micro-jet machine operation;– Shock and vibration testing;– Development of assembly and testing methods;– Strong emphasis on hands-on problem solving and implementation.
• Development & optimization of assembly and inspection processes;
• Occasionally support assembly of Mirror Modules abroad (in Berlin or Barcelona).

Qualifications and experience

• Bachelor degree in Mechanical Engineering or a related field;
• 0-2 years working experience in a high tech environment;
• Theoretical knowledge and experience in mechanical design and modeling, including experience with CAD software (preferably SolidWorks);
• General knowledge of materials, manufacturing processes and design tolerances;
• Specific knowledge on structural dynamics and mechanical stress analysis;
• Knowledge in data processing using programming languages (preferably Python);
• Ability to analyze test data (knowledge of Python desirable);
• Excellent problem-solving and analytical skills;
• Knowledge of relevant industry standards and regulations;
• Ability to write clear and comprehensive technical documentation;
• Ability to speak and write English fluently in a professional working environment, other European languages are a bonus.

We offer
A part-time or full-time onsite position in a dynamic and international setting, where you can combine your knowledge with highly innovative technology and applications with good and flexible working conditions.
Interested in this position?
Please submit your CV and a short motivation letter . We accept most file formats, but we prefer PDF.
If you have questions about working at cosine or available positions please contact Sandra Haarman, our HR Manager, at recruitment@cosine.nl or call us

• Design of mechanical components and modeling of assemblies;– Application of multiple materials, for example: plastics, silicon, and metals;– Ensure Design for Assembly;– Ensure quality, cost-effectiveness, procurement and timely delivery;– Collaborate to fully assembled, functional products.
• Assembly and testing of Silicon Pore Optics, which involves:– Detailed inspection with CMM (Coordinate Measurement Machine);– Laser Micro-jet machine operation;– Shock and vibration testing;– Development of assembly and testing methods;– Strong emphasis on hands-on problem solving and implementation.
• Development & optimization of assembly and inspection processes;
• Occasionally support assembly of Mirror Modules abroad (in Berlin or Barcelona)