Fauna's Distributed Transaction Engine (DTE) is a flexible, layered system that enables the database to achieve low latency, high availability, and strong consistency across geographically distributed regions. The DTE is inspired by the Calvin transaction protocol, which uses deterministic ordering to reduce contention and ensure strict serializability. Fauna's routing layer directs requests to the nearest region or region group, while the query coordination layer performs pre-computation of transaction inputs and effects before execution. The transaction logging layer ensures each transaction is consistently replicated across multiple replicas using an optimized version of the Raft consensus algorithm. The data storage layer consists of nodes assigned specific key ranges, ensuring the complete keyspace is represented and redundantly stored across multiple nodes in each region. Fauna's DTE offers several advantages over traditional single-node and newer distributed databases, including high performance, strong consistency, low latency, and robust fault tolerance.