Joseph Wang

Technical Portfolio

Selected data science and machine learning projects demonstrating end-to-end execution from problem definition to production deployment.

Interactive Demonstrations

Live demos and interactive showcases of my work:

WeChat Mini Program

React Native & WeChat Framework integration demo.

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WeChat Official Account

React Native & WeChat Framework integration demo.

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A/B Testing Dashboard

Interactive A/B testing analysis and visualization tool built with modern web technologies.

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E-commerce Store

Personal e-commerce platform with analytics integration and modern UI/UX.

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Data Visualization

Interactive dashboards using Tableau, Excel, and Looker for data exploration and reporting.

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AI-Powered Products

Products built with Lovable, Cursor, and AI agents demonstrating modern development workflows.

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ML / Data Analytics Projects

Yelp Data Analysis

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Tech Stack: Python, Pandas, NLP, TextBlob, NLTK, Folium, Seaborn

End-to-end NLP pipeline using TextBlob and NLTK. Performed EDA on 1M+ reviews.

Cash Flow Forecasting

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Tech Stack: Python, LSTM, Prophet, ARIMA, Time Series Analysis

LSTM & ARIMA Time-series forecasting. Reduced execution time by 4 min/epoch.

Cookie Cats A/B Test Analysis

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Tech Stack: Python, Pandas, Scipy, Statsmodels, Bootstrap, Logistic Regression

Advanced A/B test analysis with heterogeneous treatment effects, bootstrap confidence intervals, and policy simulation.

A/B Testing & Product Optimization

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Tech Stack: Python, Logistic Regression, Statistical Testing

Designed and executed A/B tests with logistic regression models. Achieved 12 basis point increase in product usage rate.

News Recommendation System

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Tech Stack: Python, LightGBM, DIN, Collaborative Filtering, Deep Learning

Personalized recommendation system using LightGBM, DIN, and collaborative filtering. Achieved 20% CTR increase.

E-commerce Pricing Optimization

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Tech Stack: Python, XGBoost, Machine Learning

Dynamic ML pricing engine using XGBoost to optimize product pricing based on demand, competition, and market conditions.

Customer Segmentation (RFM)

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Tech Stack: Python, K-Means Clustering, Customer Analytics

Full customer lifecycle analysis using Recency, Frequency, and Monetary value segmentation with K-Means clustering.

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