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Backend & SystemsTechnical Case Breakdown
Real-Time Transaction Reconciliation Engine
GoPostgreSQLRedisDockerAWSPrometheus
The Situation & Friction
The Problem
A high-volume transactional platform was experiencing payment discrepancies across multiple gateways. Midnight batch audits were failing due to database lock contention, forcing the team to spend hours on manual spreadsheet checks.
Core Objective
What Needed Solving
Eliminating payment mismatches, preventing database contention during traffic spikes, and automating reconciliation as transactions happen in real-time.
The Solution
What We Built
An asynchronous financial ledger and reconciliation service in Go and PostgreSQL that verifies settlements continuously and triggers instant alerts if an unmapped transaction occurs.
Our Engineering Approach
We mapped all incoming webhook events and identified deduplication flaws.
We designed an event-driven queue that ingests webhooks in under 15ms without locking the primary database.
We implemented a double-entry ledger schema to mathematically guarantee balanced debits and credits.
We built self-healing worker jobs that automatically match external gateway settlement reports against internal records.
Concrete Outcomes
Manual spreadsheet audits eliminated completely
Continuous real-time settlement verification within 2.5 seconds
Zero transaction loss during 5,000+ operations/sec traffic bursts
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