Payment correctness
Preventing duplicate transaction settlement
Strictly
Reduced the risk of concurrent settlement work processing the same transaction more than once.
Challenge
Settlement correctness is a financial-risk boundary. Retried or concurrent work needed a shared coordination mechanism rather than relying on process-local state.
Constraints
- Preserve the existing settlement workflow and its production behavior.
- Coordinate across service instances rather than within one process.
- Make failures visible enough for production operators to investigate.
Approach
- Introduced distributed locking around the settlement-critical section.
- Added automated monitoring for duplicate-settlement risk signals.
- Kept the change focused on correctness rather than broad workflow redesign.
Outcome
The settlement path gained cross-instance coordination and automated monitoring designed to prevent duplicate processing.
My role
Engineering leadership, architecture, delivery oversight, and production-risk ownership.