SPDT Engineer Ultra-Precision Optics Manufacturing | DELFT

At TNO’s Optics Manufacturing group, we create ultra-high-end, one-off optical components for space, semiconductor and scientific use, often pushing the boundaries of what is possible. Our process blends optical design, ultra-precision machining and high-accuracy metrology in iterative, project-specific workflows. As an SPDT Engineer, you will work at the crossroads of machining, measurement and engineering judgement, actively shaping processes and collaborating closely with specialists. The role demands independent thinking, openness to challenge and a readiness to adapt solutions based on data and multidisciplinary teamwork.

As a SPDT engineer you:

• Perform Single Point Diamond Turning (SPDT) to manufacture spherical, aspherical and freeform optical surfaces.
• Program, set up and operate ultra-precision SPDT machines for one-off and prototype components.
• Assess manufacturability in early project stages, including tolerances, deformation risks, fixturing concepts and process feasibility.
• Develop machining strategies and tooling concepts tailored to specific optical and metrological requirements.
• Perform in-process and post-process measurements using high-accuracy metrology (e.g. profilometry, interferometry, CMM-based methods).
• Translate metrology results into corrective actions in machining and process planning.
• Contribute to the design of interfaces, fixtures and mirror blanks, taking manufacturing constraints explicitly into account.
• Document process iterations, decisions and results to support learning and reproducibility.
• Collaborate intensively with optical and mechanical engineers to resolve complex, non-standard challenges.
• Maintain machines and tooling, and perform root-cause analysis when performance deviates.

You will work on unique optical components for leading organisations such as ESA, NASA, Airbus, ESO and high-tech industry partners. This role offers a rare opportunity to operate at the frontier of ultra-precision manufacturing, where learning happens primarily through practice, experimentation and close collaboration.

We offer a technically demanding environment with a high degree of autonomy, where expertise is built over time and intellectual curiosity is essential.

See more of the TNO Unit High Tech Industry and the Space Systems Engineering and Centre for Optics Manafacturing groups.

To be succesful in this role you bring:

• A background in precision engineering, instrument manufacturing, fine-mechanical technology, applied physics or similar (MBO+/HBO, depending on experience).
• At least 3 years of professional experience with ultra-precision machining or advanced CNC processes; SPDT experience is a strong asset.
• Strong ability to read, interpret and create technical drawings.
• Experience with CAD software; CAM experience is a plus.
• Comfortable working with expensive, high-value components and equipment.
• Analytical mindset with an understanding of material behaviour, surface generation and error sources.
• Able to work carefully, methodically and quality-driven, without losing sight of the broader engineering context.
• Communicates clearly within multidisciplinary teams and is willing to question assumptions — including their own.
• Proficient in English; Dutch is a plus.

Preferred (Not Mandatory):

• Experience with advanced optical metrology (interferometry, profilometry, wavefront analysis).
• Experience with corrective finishing techniques such as MRF.
• Experience combining measurement data directly with process or toolpath optimisation.

Challenging and varied work with a real impact. And plenty of opportunities as, at TNO, you are in charge of shaping your career. We offer a gross monthly salary between € 3200,00 and € 5000,00 (based on your knowledge and experience), 8% holiday pay, a 13th month bonus of 8.33% and a flex budget (5.58% + € 180). In addition, you will be given every opportunity to develop yourself.

Perhaps you would like to grow your career in the direction of commerce or consultancy? Or would you like to become a project manager? Immerse yourself in sustainable innovations? Or carve out a career as a technical expert?

TNO offers optional employee benefits, enabling you to tailor your benefits package to match your personal situation. You may also expect:

• An extremely professional, innovative working environment where colleagues are leading experts in their field.
• The opportunity to attend courses, workshops and conferences, and to receive training and coaching based on your needs.
• 34 days annual leave on a full-time basis.
• An employer that values and encourages diverse talent, with initiatives like the Female Leadership Program, our Rainbow Community and round tables on inclusion topics.
• We offer a comprehensive and flexible mobility plan that also includes full compensation for public transportation for commuting and business travel.
• Great social events with your team and other TNO colleagues. That’s how you will get to know a lot of people really quickly.
• Flexible working hours, the possibility to work parttime (32 of 36 hours) and the possibility of working from home.
• Extensive relocation package for international candidates.
• A good pension scheme.

Read more about tailoring your benefits package.

At TNO, we innovate for a healthier, safer and more sustainable life. And for a strong economy. Since 1932, we have been making knowledge and technology available for the common good. We find each other in wonder and ingenuity. We are driven to push boundaries. There is all the space and support for your talent and ambition. You work with people who will challenge you: who inspire you and want to learn from you. Our state-of-the-art facilities are there to realize your vision. What you do at TNO matters: impact makes the difference. Because with every innovation you contribute to tomorrow’s world. Read more about TNO as an employer.

At TNO we encourage an inclusive work environment, where you can be yourself. Whatever your story and whatever unique qualities you bring to the table. It is by combining our unique strengths and perspectives that we are able to develop innovations that make a real difference in society. Want to know more? Read what steps we are taking in the area of diversity, equity and inclusion.

Please apply before the 12th of April, 2026. The selection process comprises two interview rounds. The preliminary interview takes place in week 17 and 18, 2026. The second interview round has been scheduled for week 19, 2026. In a final meeting we will discuss the terms of employment and your tailored benefits package. We aim to finalize the entire process within four weeks.

The selection process may include an online assessment and a reference check.

A certificate of Conduct (VOG) is required before starting a new job at TNO.