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06 / Confidential system

Real-Time Cash Management System

A real-time cash-management system connecting POS terminals, cash deposit machines, edge gateways, AWS services, and management dashboards.

Confidential
Figure 01 — Representative project artifactNot a production screenshot
Representative blueprint-style visual for the Real-Time Cash Management System

Representative visual artifact. No client-sensitive screens or proprietary data.

Status
Confidential
Domain
Fintech · Edge Computing · Real-Time Systems
Project focus
Offline-first cash operations platform for supermarket payment infrastructure

01 / Brief

Problem and responsibility

The challenge

Supermarkets lose time and money through manual cash handling, reconciliation delays, staff exposure to cash, machine status blind spots, and late operational reporting.

My role

Software engineer contributing to backend and frontend modules for real-time transaction visibility, management workflows, device status, and offline-first cash operations.

02 / Contribution

What I worked on

The main areas I contributed to across the product and its supporting systems.

  1. 01

    Contributed to dashboard workflows for live cash visibility, branch monitoring, alerts, and reporting.

  2. 02

    Worked on backend and API-connected modules supporting transactions, device state, and operational data.

  3. 03

    Supported real-time system behavior around WebSocket-driven updates and event-based workflows.

  4. 04

    Worked within an edge-to-cloud architecture involving local persistence, cloud sync, and management interfaces.

03 / System Context

How the work fits together

Representative system flowDirection of operation
  1. 01POS / CDM
  2. 02Edge gateway
  3. 03Local buffer
  4. 04Cloud events
  5. 05Live dashboard

Generalized to communicate system context without exposing client-sensitive implementation details.

  • A1Edge layer: POS terminals, industrial gateway, cash recycler/CDM, Node.js, SQLite, 4G failover.
  • A2Cloud layer: AWS API Gateway, Lambda, EventBridge, Aurora PostgreSQL, Redis, S3, CloudWatch.
  • A3Realtime layer: WebSocket channels, Redis connection registry, and live dashboard updates.
  • A4Application layer: React dashboard and React Native management interfaces.

04 / Evidence

Outcome and engineering evidence

  • 01Designed around reducing daily reconciliation from more than two hours to under five minutes.
  • 02Offline-first design target supports local buffering of 10,000+ transactions.
  • 03Demonstrates work in a fintech-adjacent system with hardware, cloud, real-time data, and compliance concerns.

Technical environment

Tools used across the project.

Node.jsAWS LambdaAPI GatewayAurora PostgreSQLRedisEventBridgeReactReact NativeSQLite