Senior/Lead Data Scientist -Credit

ph3What You Will Do /h3 pYou will work on some of the most technically interesting modelling problems in fintech, training large transformer-based models on long sequences of real-world transactional events. You will design tokenisation schemes for numerical, categorical, and temporal features, making deliberate decisions about vocabulary size, sequence length, and information compounding. Your work spans the full model lifecycle from data preparation through to production and you will translate research decisions into systems that set the direction for how machine learning operates across Klarna. You will be part of a small, high-ownership team where what you build has genuine impact on the products Klarna ships. /p h3Who You Are /h3 ul liDeep understanding of transformer architectures and sequence modelling, with the ability to reason through architectural tradeoffs /li liHands‑on experience designing tokenisation schemes for heterogeneous feature types such as numerical, categorical, and temporal /li liProficiency in Python, PyTorch, SageMaker, and Airflow /li liExperience owning the full model lifecycle, from training through to serving in production /li liComfortable working in a small, high-ownership team on open-ended technical problems /li /ul h3Nice to Have /h3 ul liExperience with Triton kernels or GPU-level optimisation /li liBroader ML background spanning areas beyond deep learning /li liExperience with large-scale transactional or financial data /li liBackground in ML infrastructure or MLOps /li /ul /p #J-18808-Ljbffr