Joyce Zhang

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
See more

Language

English
Fluent

Work Experience

Senior Machine Learning Engineer at Uber
February 1, 2023 - Present
Led Uber's Generative AI integrations platform, enabling secure, scalable generative AI across 30+ teams. Built integrations using Go, OpenAI APIs, Google Vertex AI, and custom private prediction to support 16M+ monthly queries at peak 25 QPS.
Machine Learning Engineer at Uber
July 1, 2021 - March 31, 2023
Redesigned driver earnings heatmap using Gaussian mixture deep models (PyTorch), improving earnings prediction accuracy and driver engagement by 18%. Optimized global incentive allocation with Ray + Spark hybrid pipelines, enabling 40× faster optimization and city-level scenario planning. Enhanced Upfront Fares & Trip Radius via distributed microservices; built a distributed simulation framework with Spark and agent-based modeling to accelerate policy validation. Implemented real-time surge pricing adjustments across 100+ metro areas. Embraced continuous feedback, transparency, and robust engineering practices.
Machine Learning Intern at Uber
June 1, 2018 - August 31, 2018
Researched model drift and data drift signals in historical payment logs; built visualization dashboards in Python to analyze customer behavior and risk indicators; supported product managers with data-driven insights.
Research Assistant at University of Michigan
November 1, 2016 - April 1, 2017
Collaborated with approximately 70 Michigan hospitals to review appendectomy datasets and improve surgical quality measures. Developed an index enabling meaningful cross-site comparisons; applied Spearman correlation, logistic regression, and ordinal logistic regression to assess surgical quality.
Research Assistant at Harvard University
October 1, 2017 - December 1, 2017
Combined a depression-related dataset for the US and China (2000–2012) using SQL; analyzed ~30 million cases via dataset imputation and regression; explored covariate correlations with linear, logistic, and ordinal logistic regression. Predicted depression distribution for 2013 using methods including LDA and hierarchical clustering; reduced RMSE with random forest.

Education

Master of Science in Data Science at Harvard University
January 1, 2017 - January 1, 2018
Bachelor's Degree in Mathematics and Statistics at University of Michigan
January 1, 2014 - January 1, 2017

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Media & Entertainment, Transportation & Logistics