Kilian Merkelbach

Artificial Intelligence and Machine Learning

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Hi, I’m Kilian, an Applied Researcher at eBay with a PhD in AI. My journey in AI began over a decade ago during my Bachelor’s at RWTH Aachen, one of Europe’s leading tech schools. During my Master’s, I explored the world of computer vision and built a generic object tracker for autonomous driving. For my PhD, I pivoted to time series analysis in an effort to make sense of complex, temporal data (see my publications).

At eBay, I’m part of the search team, working on making the platform’s understanding of natural language even better and bringing real value to our customers. My toolbox is filled with languages and frameworks like Python, TensorFlow, and PyTorch, and I’m always looking for new ways to solve old problems. If you’re curious about AI or have a problem you think AI might be able to solve, I’d love to chat. Reach out anytime!

latest posts

selected publications

  1. AI-safe Autocompletion with RAG and Relevance Curation
    Kilian Merkelbach, Ksenia Riabinova , and Arnab Dutta
    In Proceedings of the 33rd ACM International Conference on Information and Knowledge Management , 2024
  2. A Chain-of-Thought Approach to Semantic Query Categorization in e-Commerce Taxonomies
    Jetlir Duraj , Ishita Khan , Kilian Merkelbach, and 1 more author
    arXiv preprint arXiv:2601.00510, 2026
  3. Semantic Filter Recommendation for eCommerce Search
    Kilian Merkelbach, and Antonino Freno
    In Proceedings of the 34th ACM International Conference on Information and Knowledge Management , 2025