ba Bis building core financial infrastructure for observing, reconciling, and controlling money movement across banks, payment rails, and internal ledgers.

In practice, the same transaction fragments across systems with different IDs, partial fields, and contradictory timestamps; events arrive late or out of order; retries create duplicates; reversals and chargebacks break naive state machines; settlement lags blur what “complete” even means. What emerges is a patchwork of dashboards, ad-hoc scripts, manual queues, and spreadsheet-led truth — until volume, audits, or an incident expose the gaps. Addressing this requires deterministic state, explicit handling of failure, audit-ready evidence, and workflows designed for regulators and human operators, not just engineers.