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Outbox Pattern Module
A tested starting point for outbox pattern module reduced repeated setup work.
We built a practical FinTech solution combining atomic outbox persistence, change data capture (cdc) system, and idempotent consumer logic. The project delivered 100% Data Consistency and 0ms State Mismatch.
Trusted by teams building ambitious products
Ready to grow core banking systems managing multi-currency ledgers across distributed smaller independent services.
Principal Backend Architect + Distributed Systems Engineer + SRE Lead embedded within the Core Banking unit.
Eliminating race conditions and partial failures that caused discrepancies between internal databases and downstream event streams.
A practical solution designed around the client’s existing tools, teams, and day-to-day workflow.
The client’s modular cloud system design suffered from the Dual Write problem: services attempted to update a database and publish a Live data service event simultaneously. When the message broker fluctuated, the database remained updated but downstream systems (Fraud, Analytics, Notifications) never received the event.
The biggest issues were financial drift, day-to-day cost, and audit failure. The team needed a faster, clearer way to manage the work while keeping the right checks in place.
Database updates succeeded while Live data service writes failed, causing silent Inconsistent Data.
State and event are coupled in a single transaction. both succeed or both roll back.
Discrepancies required manual intervention to re-sync distributed smaller independent services.
Every state change triggers exactly one event, ensuring downstream systems are mirrors of truth.
Application code was responsible for complex retry logic and failure handling.
CDC processes events via database logs, freeing the application from messaging concerns.
By tapping into the Write-Ahead Log (WAL), we ensured that every single ledger transaction was captured without modifying application logic.
The Outbox table serves as a permanent, secure and traceable record of every event generated, enabling perfect state reconstruction during audits.
If the message broker goes down, the Outbox relay simply pauses and resumes from the last known log offset, losing zero data.
Tested foundations helped the team spend less time on setup and more time on the parts that made this product useful.
A tested starting point for outbox pattern module reduced repeated setup work.
Reusable work for idempotency platform module let the team focus more time on the client’s specific needs.
This made it easier to add consistency monitoring platform without rebuilding common foundations.
A tested starting point for distributed state safety controls reduced repeated setup work.
A straightforward before-and-after view of what changed for the team and their customers.
Atomic writes eliminated the gap between database state and downstream event availability.
Guaranteed event delivery removed the need for daily data-fix engineering tasks.
CDC-based streaming ensures zero message loss even during broker failures or network partitions.
Coretus didnt just fix a bug, they redesigned our core transactional integrity. The Outbox' implementation eliminated ledger drift entirely, giving our auditors a 100% consistent view of every financial event.