Jonathan Kozaczuk

Senior Applied Scientist (AI/ML) @ Amazon

San Diego, California, United States

About

I'm a PhD scientist working on various aspects of machine learning, from fundamental research to deploying models that serve millions of customers. Prior to this role, I worked as a theoretical physicist studying new particles and forces beyond the Standard Model. I thrive on pioneering new solutions to challenging technical problems.

Experience

  • Amazon (San Diego, California, United States)
    • Senior Applied Scientist
      Oct 2024 - Present · 1 yr 9 mos

      Currently working on building proprietary genAI foundation models for understanding customer behavior across Amazon. My role focuses both on fundamental research and developing models for production.

    • Applied Scientist
      Jul 2022 - Oct 2024 · 2 yrs 4 mos

      Pioneered global modeling techniques for Amazon’s Buyer Risk Prevention team. Trained and deployed models at scale for both retail and Amazon Pay applications. Also worked on fundamental AI research, publishing a first-author paper in NeurIPS 2023 on deep learning methods tailored to tabular data.

  • Data Scientist at Broadcom Inc.
    Feb 2021 - Jul 2022 · 1 yr 6 mos

    Leveraged state-of-the-art data analytics and machine learning techniques to detect and prevent fraudulent e-commerce transactions in the 3D-Secure space as part of Arcot (Broadcom’s Payment Security division). Worked on all aspects of model development, from data preprocessing, to training and evaluation.

  • Assistant Project Scientist at UC San Diego
    Aug 2019 - Feb 2021 · 1 yr 7 mos

    Performed independent research on theoretical particle physics and cosmology.

  • Postdoctoral Research Associate at University of Illinois at Urbana-Champaign
    Sep 2018 - Aug 2019 · 1 yr

    Performed independent research on theoretical particle physics and cosmology.

  • Postdoctoral Research Associate at University of Massachusetts Amherst
    Sep 2016 - Aug 2019 · 3 yrs

    Performed independent research on theoretical particle physics and cosmology.