Yupeng contributed a few core features to Pinot, such as upsert and geospatial support. He also spoke at a number of meetups and conferences like Kafka Summit on those features. 

Yupeng leads the real-time data infrastructure at Uber, and published a blog on the operational learnings at https://eng.uber.com/operating-apache-pinot/. He is also the co-author of Uber’s research paper “Real Time Data Infrastructure at Uber”, which highlights Pinot as the real-time OLAP engine solution for Uber.