Among others, the projects he's worked on include:
Spanner - a scalable, multi-version, globally distributed, and synchronously replicated database
Some of the production system design and statistical machine translation system for Google Translate.
BigTable, a large-scale semi-structured storage system.
MapReduce a system for large-scale data processing applications.
Google Brain a system for large-scale artificial neural networks
LevelDB an open source on-disk key-value store.
TensorFlow an open source machine learning software library.