Uber’s payment system, handling trillions of dollars in transactions, faced challenges with scattered financial data. To address this, they implemented a job order system, ensuring a balanced ledger with entries for every financial movement. This system, built on an immutable ledger store with periodic sealing and cryptographic verification, provides data integrity and security.

Uber built a custom financial platform using an immutable ledger to handle 250 billion records and 300 terabytes of data. They phased the data migration, using checkpoints and a shadow writer system for data integrity. The platform utilizes trillions of indexes, including strongly consistent indexes for critical transactions and eventually consistent indexes for less time-sensitive data, to efficiently manage and query the data.

The conversation highlights the engineering behind digital transactions, using Uber as an example.