The Challenge
A regional logistics company in Austin was running on a legacy .NET monolith that took 800ms per API call, couldn't handle more than 50 concurrent fleet trackers, and was impossible to extend. They needed a complete migration with zero downtime.
Our Solution
React.js dashboard with real-time WebSocket updates. Node.js microservices replacing the .NET monolith. PostgreSQL with PostGIS for geospatial queries. Redis for caching and pub/sub. Deployed on AWS ECS with blue/green deployment for zero-downtime migration.
Architecture Highlights
Strangler fig migration. We didn't rewrite everything at once. Each .NET endpoint was replaced one-by-one with a Node.js equivalent, routed via an API gateway. The old system was decommissioned module by module.
Real-time fleet tracking. GPS pings from 200+ vehicles processed via WebSockets, with positions updated on the dashboard every 2 seconds.
Results
17x faster API — average response dropped from 800ms to 45ms. Zero downtime during migration. 500+ concurrent fleet trackers supported. 30% fuel savings from route optimization algorithms.