Cindy Zhang

About Cindy Zhang

Computer Science junior student at Columbia University. Actively seeking career…

Experience

1. Data Analyst

   Microsoft

   Jul 2025 — Present · Shanghai, CN

   Led a data-driven project to forecast product revenue growth using seasonal time series and machine learning models. Key contributions included: • Extracted and preprocessed product-level revenue data from structured datasets. • Visualized time series data to identify trends and seasonality patterns. • Built and validated AR, ARMA, ARIMA, and SARIMA models to forecast quarterly revenue growth. • Split data into training and test sets; evaluated model performance using appropriate error metrics. • Transitioned from univariate to multivariate regression models, integrating external tabular data with feature engineering. • Handled missing values and assessed feature impact on predictive performance. • Applied advanced machine learning models (Lasso, KNN, Random Forest, GBDT, LSTM) with hyperparameter tuning to improve accuracy. • Compared traditional statistical models with modern ML approaches to determine optimal forecasting strategies under complex data scenarios.