Yi Cai Email & Phone Number

San Francisco, California, Us

Manage consumer abuse team, including payment abuse, promotion abuse, and credit/refund abuse team

San Francisco, California, Us

Working in Fraud team of DoorDash. Currently leading Consumer Identity and Promotion Abuse Prevention function. Led Dasher Identity and Account Security function prior to the current position.

Worldwide, Oo

Led engagement teams with various background, including data science, data analytics and technology background, to provide advisory services and deliver data-driven solutions Performed data mining and analysis on large transactional data to identify unusual behavior patterns and suspicious customers/transactions (e.g., money laundering activities) using various tools (e.g., SQL, R)Developed, validated, and implemented machine learning models (e.g., clustering model, gradient boosting model) to identify money-laundering and sanctions violation activities Designed performance monitoring methodologies for models and system operation, including identifying metrics/KPIs, risk tolerances/thresholds, and relevant procedures (e.g., issue management procedure)Developed and implemented various statistical sampling methodologies (e.g., stratified sampling, multi-stage sampling) and perform statistical inference (e.g., estimating confidence interval)Led an innovation team to develop robotic process automation (RPA) tools (e.g., data quality assessment tool, sanctions screening effectiveness testing tool) to improve the efficiency of testing process and manage relevant data processes and databaseDesigned and managed internal SQL databases to archive US sanctions lists using R and SQL, and develop a front-end tool for non-technical users to extract the data Developed and enhanced model and data policies and procedures, such as model governance framework and procedures, model performance monitoring procedure, and data governance procedure

London, Gb

Provided quantitative advisory service and work directly with clients in financial industry, covering major credit card companies, top consumer banks and investment banks. Participated in multiple engagements, including both model development and model validation, across different areas, e.g., CCAR models, pricing models, and anti-money laundering (AML) models. Led engagement team including assigning team priority, providing guidance, driving client meeting and reviewing deliverable during engagement.

Chicago, Il, Us

Chicago, Il, Us

Managed the operational risk (e.g., default rate, customer acquisition cost, loan issue rate) of the loan products in US and UKPerformed A/B testing for model changes and implementation and provided suggestions to business owners based on the data analysisBuilt logistic regression and random forest models for loan underwriting, including credit risk (default rate) model and profitability rate score modelDeveloped models (e.g., gradient boosting model, random forest model) to optimize the post-default processes, including debt collection and sale processBuilt internal reporting system using R-shiny to track portfolio metrics and model performance

Built more than 20 functions and predicting models, including periodical detecting, multiple variable time series modelsDesigned SQL functions in R so that the model could work with the database smoothly

Armonk, New York, Ny, Us

Worked as consultant in IBM Global Business Service Department.Aided the department of ERP consulting for human resource of client, Huneng GroupCommunicated with more than 20 subsidiary corporations and assisted with SAP system development and operation to improve workflow efficiency

Assisted the industry analysis of groupon industry in ChinaCollected and analyzed data from clients and reported to the investment manager in the program of Tongjitang Medicine Co., Ltd

Cn

Contributed to the investment projects of the subway corporation of Nanjing Province and Hefei Province, including evaluating the risk and take on-the-spot investigation with clientsAttended the initial evaluating for the traveling development project in Hebei Province with on-the-spot investigation with clients

Participated in the annual audit of China Arts & Entertainment Group and its subsidiariesAttended the annual audit of the Theatre of Guangzhou, in Guangdong Province

Master Of Science (M.S.), Statistics

Bachelor'S Degree, Statistics