Materials & Process Engineer

Materials & Process Engineer - Optical Casting AddOptics
Rotterdam, Netherlands
Posted on Aug 27, 2026 Own the Process. Master the Material. Make It Production-Ready.
Location : Rotterdam, NL Commitment : Full time Experience : 5+ years
You know that getting a casting process right is equal parts science, instinct, and stubbornness.
At AddOptics, we manufacture precision ophthalmic lenses for customers across eyewear, consumer electronics, and critical technologies. As we scale and expand our material capabilities, we need someone who can take new casting materials and turn them into a stable, repeatable, production-ready process.
This is a hands-on role with full domain ownership. You'll be the expert. You'll define how we work with materials, and you'll see your processes become the standard. What You'll Be Working On -
Implementing new ophthalmic casting materials (PU systems, monomer formulations, silicone tooling) into production - taking them from initial evaluation to stable, SOP-ready process -
Solving the hard casting challenges: eliminating bubbles, controlling shrinkage, removing residual stress, and achieving consistent optical quality and ISO prescription accuracy -
Developing and optimising curing cycles that are predictable, repeatable, and scalable -
Working directly with material and machinery suppliers - troubleshooting together, pushing for solutions, and knowing when to try a different approach entirely -
Evaluating new or alternative materials for ophthalmic lens applications - assessing feasibility, optical performance, and manufacturing compatibility -
Writing clear, practical SOPs that allow the production team to execute consistently without you in the room -
Building the knowledge base and process framework for materials engineering at AddOptics from the ground up What We're Looking For -
5+ years of hands-on process or materials engineering experience in optics, ophthalmic manufacturing, or p...