Architecting a Zero-Trust Double-Entry Ledger Processing Over 100,000 Transactions Daily.
Engineered an immutable, event-driven ledger system in Next.js and PostgreSQL with Zero-Trust Row Level Security, eliminating reconciliation discrepancies and achieving sub-50ms audit compliance.
Handled sustained peak bursts with zero database locking or transaction deadlocks.
Reduced from over 1,400ms on the previous monolithic legacy infrastructure.
Immutable audit trail verified 100% accurate across two consecutive banking audits.
The Context & Initial Architecture
A fast-growing multi-currency payments gateway was experiencing database lock contention and reconciliation discrepancies during peak remittance windows. Their legacy Node.js monolith couldn't scale without significant latency spikes.
The Technical Bottleneck & Constraints
The system required strict ACID double-entry accounting guarantees, zero transaction loss under network partition, strict regulatory isolation between enterprise tenants, and audit reporting ready for banking partner inspections.
System Design & Implementation Flow
We designed an event-sourced distributed ledger using PostgreSQL row-level locks, partitioned tables, and asynchronous settlement workers orchestrated via Docker and Redis queues.
1. Edge Ingestion & Idempotency Check
API requests validated at the edge with cryptographic HMAC signatures and Redis-backed idempotency keys to prevent duplicate transaction execution.
2. Zero-Trust Database Transaction
PostgreSQL advisory locks execute balanced debit/credit ledger mutations in a single atomic database function guarded by Row Level Security.
3. Asynchronous Webhook & Event Dispatch
Transactional outbox pattern dispatches Realtime WebSocket updates to the client console and queues signed HTTP webhooks to merchant endpoints.
“Onesign Concept transformed our payments infrastructure from a fragile liability into our biggest competitive advantage. Their zero-trust architecture is flawless.”
Marcus V.
VP of Engineering, PayFlow Global
Technologies Utilized
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