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Case Study 04 Logistics & Real-Time Geospatial Shipped to Production

Real-Time On-Demand Fleet & Logistics Platform

Engineered a high-concurrency dispatch and live tracking ecosystem connecting customer demand with mobile drivers in real-time—featuring PostGIS radius indexing, WebSocket telemetry, and automated route pricing.

NestJS TypeScript Microservices PostgreSQL / PostGIS Spatial Socket.io / Redis Pub/Sub Turborepo Monorepo (Expo React Native) Dynamic Routing & Geofencing
THE BOTTLENECKS

Laggy Tracking & Dispatch Friction

  • Database crashing under high-frequency GPS ping updates from hundreds of active vehicles.
  • Inaccurate manual driver assignment causing long pickup waiting times and driver churn.
  • Disconnected mobile apps failing to sync state during temporary cell tower transitions.
  • No automated audit trail to resolve delivery disputes or route detours.
THE ARCHITECTURE

In-Memory Pub/Sub & Spatial Indexing

  • Redis in-memory geospatial caching handling sub-10ms driver location updates.
  • PostGIS spatial indexing calculating nearest available drivers with traffic-aware ETAs.
  • WebSocket state synchronization across Customer, Driver, and Dispatcher screens.
  • Automated dynamic surge pricing and transparent digital billing receipts.
System Topology

Engineered Components & Data Flow

LAYER 01

Tri-App Monorepo

Expo React Native apps sharing a single shared UI & business logic package across iOS and Android.

LAYER 02

Real-Time Socket Fabric

Clustered WebSocket servers with Redis adapter delivering live coordinate streaming in < 50ms.

LAYER 03

PostGIS Spatial Core

Geospatial R-Tree indexing executing sub-second radius searches and polygon geofence checks.

LAYER 04

Dispatch & Billing Worker

Automated queue processor executing driver escalation cascades, surge calculation, and payouts.

Core Modules

Engineered Capabilities

📍

Sub-50ms Live Coordinate Tracking

Smooth vehicle movement interpolation with client-side map bearing smoothing and bandwidth-optimized delta compression.

🎯

Smart Dispatch & Cascading Bids

Radial candidate selection prioritizing nearest drivers with timeout cascades to guarantee 99%+ order fulfillment within 45 seconds.

⚡️

Dynamic Zone Geofencing

Custom administrative polygon tool allowing operators to define priority delivery hubs, restricted corridors, and localized pricing tiers.

💳

Automated In-App Payouts & Wallets

Integrated digital wallet ledger tracking gross fares, platform commissions, tips, and automated weekly bank payouts for drivers.

< 50ms Telemetry Latency
99.4% Auto-Dispatch Match Rate
10k+ Concurrent WebSocket Conns
4 Weeks Full-Stack Sprint
Custom Sprint Delivery

Need a Real-Time Fleet, Delivery, or Dispatch Platform?

Available for 4–6 week full-stack engineering sprints to build on-demand ride/delivery ecosystems, geospatial dispatch tools, and cross-platform mobile apps.

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