Secure Fintech Payment Platform with Real-Time Analytics

The Challenge

The client's legacy payment infrastructure was fragmented across three vendors, causing settlement delays of up to 3 days, high transaction failure rates, and zero real-time visibility into cash flow.

• Transaction failure rate exceeding 8% on peak load days
• 3-day settlement delays blocking working capital
• No unified dashboard — finance teams used 4 separate tools
• PCI-DSS compliance gaps flagged in recent audit
• Manual reconciliation consuming 40+ hours per week

Our Strategic Approach

We began with a 2-week discovery sprint mapping every payment touchpoint, failure mode, and compliance requirement. Our architecture decision: a microservices-based payment gateway with an event-driven ledger, enabling real-time reconciliation without locking any existing banking integrations.

The Solution We Delivered

A unified payment platform built on Node.js microservices with a React dashboard, PostgreSQL ledger, and Redis-powered fraud scoring engine. The platform connects to existing banking partners via standardised APIs while exposing a clean merchant-facing SDK.

• Real-time transaction monitoring dashboard with drill-down analytics
• Automated multi-currency reconciliation engine
• ML-based fraud scoring with sub-100ms decision latency
• PCI-DSS Level 1 compliant data vault
• Webhook event system for instant settlement notifications
• Role-based access for finance, ops, and compliance teams

Technologies Used

• Node.js — Microservices API layer and payment orchestration
• React — Merchant dashboard and internal ops console
• PostgreSQL — Immutable transaction ledger with audit trail
• Redis — Real-time fraud scoring cache and rate limiting
• AWS — ECS container orchestration, RDS, and CloudHSM for key management
• Stripe Connect — Underlying payment rails and card processing

Development Process

1. Discovery & Compliance Audit — Mapped existing payment flows, identified PCI-DSS gaps, and defined the unified data model
2. Core Ledger Architecture — Built the immutable PostgreSQL event ledger with idempotency keys for safe retries
3. Gateway Microservices — Developed payment initiation, settlement, and refund services with circuit breakers
4. Fraud Engine Integration — Integrated ML fraud scoring pipeline with real-time Redis cache
5. Dashboard & Reporting — Built the React merchant dashboard with live WebSocket feeds and CSV export
6. Compliance & Pen Testing — Conducted full PCI-DSS audit and third-party penetration testing before go-live

Results & Impact

The platform went live in 11 weeks and immediately reduced transaction failure rates, automated reconciliation, and gave the finance team a single source of truth.

• Transaction failure rate dropped from 8.2% to 0.4%
• Settlement time reduced from 3 days to 4 hours
• 40+ hours/week of manual reconciliation eliminated
• PCI-DSS Level 1 compliance achieved pre-launch

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