Tech lead in Content Ranking team. Founding member of Snapchat short-form video recommendation product (a.k.a Spotlight). Working on large-scale ML ranking systems and algorithm optimizations, including multi-stage ranking, retrieval, feature engineering, training data pipelines, model training and inference.

Instagram Ads Delivery and Ranking team. Worked on multi-stage Ads delivery and ranking, feed / story ads insertion and ad load control to achieve revenue goal.

Enable F1 SQL query and data export on Google Spreadsheet.

Integrate gRPC with etcd and zookeeper for service discovery.

Build a distributed content based pub / sub system.