Two-level transaction categorisation pipeline for a Spanish fintech aggregator. LightGBM L1 (91.2% accuracy, 16.8ms) escalates to Azure OpenAI L2 only when confidence drops. GDPR-safe via Presidio + regex anonymisation. FastAPI + Streamlit.
python fintech lightgbm gdpr anomaly-detection pfm fastapi presidio pii-detection streamlit sentence-transformers azure-openai llm gpt-4o-mini transaction-classification
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Updated
Jun 1, 2026 - Python