PhD Student (m/w/d) (Ingenieur/in - Bau)

The Institute for Materials Data Science and Informatics (IAS-9) develops advanced Machine Learning & Artificial Intelligence methods tailored to challenges in the physical sciences and engineering, bridging data-driven approaches with domain knowledge to push the boundaries of scientific discovery. Our group brings together ML engineers, AI researchers, data scientists, research software engineers, and domain scientists with a shared focus on scientific machine learning. Together, we develop and apply ML methods to tackle key challenges in the physical sciences and engineering: from accelerating simulations with surrogate models to extracting insights from complex imaging data, and building approaches that transfer across domains.In addition, we benefit from a strong connection to the Ernst-Ruska-Centre for Electron Microscopy and to the Jülich Supercomputing Center. We are particularly interested in advancing foundational machine learning methods for scientific imaging, with a focus on representation learning and data-efficient decision-making across heterogeneous data sources.PhD Position - Representation and Active Learning for Multi-Scale Scientific Imaging The PhD project is methodologically independent and embedded in a multidisciplinary research environment at the interface of artificial intelligence, scientific imaging, and materials research. You will strengthen the data science and machine learning activities of IAS-9 by developing core AI methods with applications to electron microscopy and materials discovery. You will work in a team of data scientists, software engineers, and experimental researchers on topics including:

• Developing multi-scale and multi-modal representation learning methods for scientific imaging data (e. g., SEM, TEM, EBSD).
• Learning representations that are robust to scale changes, modality shifts, and domain differences across instruments and laboratories.
• Designing active learning and experimental design strategies that use learned representations to guide data acquisition under cost and uncertainty constraints.
• Building surrogate models that connect imaging-derived representations with downstream physical or functional properties.
• Collaborating closely with experimental partners to integrate decision-making algorithms into real scientific workflows.
• Publishing results in high-impact machine learning and interdisciplinary journals and conferences, and contributing to open-source research software.The developed methods will be validated using large-scale electron microscopy data from collaborative research projects, including an EU-funded project on sustainable steel development, while maintaining a clear focus on fundamental AI research questions.

We are looking for a highly motivated candidate with a strong interest in foundational machine learning research and its application to real-world scientific problems. You should bring:

• A completed university degree (Master or equivalent) in computer science, data science, applied mathematics, physics, materials science, or a related field.
• Solid background in machine learning and/or computer vision.
• Interest in representation learning, active learning, uncertainty modeling, or decision-making under constraints.
• Experience with Python and modern ML frameworks such as PyTorch or TensorFlow.
• Curiosity for interdisciplinary research; prior experience with scientific or microscopy data is welcome but not required.
• Strong analytical skills, scientific creativity, and the ability to work independently w...