Elena Petrova
Data Scientist
Summary
Senior Data Scientist with 6+ years of experience developing machine learning models and predictive analytics systems in Python, SQL, and AWS. Proven track record of translating complex business problems into high-impact statistical solutions, boosting customer retention by 19% and driving over $2.4M in incremental revenue through algorithmic personalization.
Experience
- Built an XGBoost churn-prediction model on 2m user records, identifying at-risk accounts with 84% precision and lifting retention by 19%.
- Engineered a real-time recommendation engine in Python and Redis, lifting average order value by 14% across 450k active shoppers.
- Designed statistical A/B testing frameworks across 20 product experiments, reducing required sample duration from 4 weeks to 9 days.
- Automated ETL pipelines in PySpark and Snowflake, cutting daily feature generation runtime from 5 hours to 35 minutes.
- Delivered executive churn dashboards in Tableau and Streamlit, enabling weekly retention interventions for 50 account executives over 12 months.
- Mentored 4 junior analysts on statistical modeling and SQL optimization, improving team query performance by 40% over 12 months.
