Cristian Julian M.

Data analyst and data scientist with 5+ years of experience turning data into business decisions. I've worked with companies like Rappi, IBM and Teleperformance, and I'm currently completing a Master of Data Science and Innovation at UTS Sydney, where I build machine learning models on real business problems. Data analytics: • SQL and data modelling (Snowflake, PostgreSQL, dbt) • Dashboards and reports in Power BI and Amazon QuickSight • Automated reporting and ETL pipelines • A/B testing, customer segmentation and KPI tracking Data science and machine learning: • Predictive models in Python (scikit-learn): classification, regression, clustering and anomaly detection • Customer churn prediction, credit/loan risk and healthcare outcome models • Feature engineering, EDA and model evaluation explained for non-technical stakeholders • Big data processing with Databricks and Spark (90M+ row datasets) • Interactive data apps with Streamlit and Plotly, including sentiment analysis (NLP) • GenAI projects with LangChain and RAG Recent results: • Automated a reporting pipeline at IBM, cutting manual work from 20 to 2.5 hours per week • Led A/B tests at Rappi that increased service fee revenue by 5% • Improved a client categorization model used to guide commercial investment I focus on the business question first, then pick the right tool, and explain results in plain language. Fluent in English and Spanish. Send me your data problem and I'll tell you how I'd approach it.