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Milan, Lombardy, Italy · Hybrid
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Skills: Inbound Sales, B2B Telemarketing, CRM Management, Lead Qualification, HubSpot
Klarna
Milan, Lombardy, Italy • On-site
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Develop and train large transformer-based models on transactional event sequences to solve complex fintech modelling problems. Manage the full model lifecycle from data preparation and tokenisation design to production deployment.
Requires deep expertise in transformer architectures, sequence modelling, and proficiency in Python, PyTorch, and MLOps tools. Candidates should have experience handling heterogeneous feature types and owning models in a production environment.
What you will do
You 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.
Who you are
Deep understanding of transformer architectures and sequence modelling, with the ability to reason through architectural tradeoffs
Hands-on experience designing tokenisation schemes for heterogeneous feature types such as numerical, categorical, and temporal
Proficiency in Python, PyTorch, SageMaker, and Airflow
Experience owning the full model lifecycle, from training through to serving in production
Comfortable working in a small, high-ownership team on open-ended technical problems
Experience with Triton kernels or GPU-level optimisation
Broader ML background spanning areas beyond deep learning
Experience with large-scale transactional or financial data
Background in ML infrastructure or MLOps
Please include a CV in English
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