Spearheaded the development and launch of Roblox's first user recommendation system ("People You May Know") on the homepage. Designed and wrote the data pipelines in Spark (py + scala) & Airflow. Worked with modelers to train and serve ML models. Designed and implemented the end to end serving stacks.

Homepage friends ranking by machine learning model.

Tech lead responsible for the Speech recognition quality of major Google Assistant features.

Tech lead in Google Assistant Media team, responsible to improve the media quality. Projects includes:

* Replace the heuristic scattered ranking logics with a rank-late-and-centralized machine learning model.

* Collect Assistant user's satisfaction score to improve candidate retrieval and ranking.

* Improve audio / video classification on the query intent.

* Improve Speech recognition precision with top entities.

* Overall headroom analysis and projects planning.

Tech lead in Assistant Media team, responsible for quality improvements and the launch of new media features in the screenful Google Assistant (e.g. Nest Hub, Android TV).

Improve the books metadata quality on books.google.com.