Notes from production: distributed systems, banking platforms, and the staff-engineer path.https://indreshgahoi.com/https://indreshgahoi.com/blog/exactly-once-effects-on-an-at-least-once-queue/https://indreshgahoi.com/blog/exactly-once-effects-on-an-at-least-once-queue/A reference implementation in Java 21 / Spring Boot of the SQS + DynamoDB conditional-write pattern I use in production banking systems to stop duplicate deliveries from becoming duplicate debits.Sun, 16 Aug 2026 00:00:00 GMTdistributed-systemsawsbankingidempotency