Tomislav S.

Results-driven Data Scientist with 7+ years delivering production ML solutions for Fortune 500 companies and startups. I specialize in Media Mix Modeling (MMM), IoT predictive analytics, and agentic applications, with proven ROI in the millions. CORE EXPERTISE Machine Learning & AI: Python, PyTorch, Scikit-learn, XGBoost, Time Series Forecasting (Prophet, DARTS, Nixtla stack), Causal Inference, A/B Testing, Bayesian Modeling (PyMC) LLM & RAG: OpenAI, HuggingFace, LangChain, LangGraph, ChromaDB, FAISS MLOps & Cloud: Docker, Kubernetes, MLFlow, GitHub Actions, Databricks, AWS (S3, SageMaker, Redshift), Azure (ML, Synapse, ADF), databricks, model monitoring, drift detection Data Engineering: PySpark, Pandas, Polars, ETL pipelines, data quality frameworks (Great Expectations) SPECIALIZED SOLUTIONS ✓ Media Mix Modeling (MMM): Led Heineken's most successful analytics project—captured tens of millions in value first year. Bayesian attribution modeling, channel optimization, ROI measurement, budget allocation. ✓ IoT ML Solutions: Equipment monitoring, predictive maintenance, sensor data analytics, anomaly detection at scale—deployed solutions still running 3+ years later. ✓ RAG & LLM Applications: Production knowledge retrieval systems for financial services. Semantic search, document analysis, evaluation frameworks, prompt optimization. ✓ Entity Deduplication & Record Linkage: Fuzzy matching, probabilistic record matching at scale (millions of records), customer/product master data. ✓ Supply Chain & Logistics: Demand forecasting, inventory optimization, route planning, cost-benefit simulation. WHY WORK WITH ME? → End-to-End Delivery: From data architecture to production deployment - I handle the full ML lifecycle so you don't need multiple specialists. → Business Impact: My solutions deliver measurable ROI and remain operational years after launch. One client brought me back to improve my original work - the ultimate validation. → Startup-Ready: Modern tech stack (FastAPI, Streamlit, containerized deployments), rapid prototyping, pragmatic solutions over academic theory. → Scientific Rigor: PhD in Physical Chemistry from University of Amsterdam - I bring systematic methodology to ambiguous business problems. Looking for ML/AI expertise that delivers real business value? Let's discuss how my specialized skills can accelerate your data science initiatives.