Architected and built from scratch the core delivery coordination microservice for WhatsDish platform using Go and Hertz framework. Optimized PostGIS geospatial queries achieving sub-100ms response times for driver proximity searches, enabling real-time driver assignment based on location. Integrated Google Maps APIs for multi-waypoint route calculation with distance matrix optimization and polyline encoding for turn-by-turn navigation. Designed payout calculation engine accounting for base rates, distance-based fees, and time bonuses with dynamic rate adjustments. Implemented Protocol Buffers for type-safe API contracts with code generation. Built WebSocket infrastructure supporting 100+ concurrent driver connections for real-time location tracking. Deployed production infrastructure on AWS ECS Fargate using Terraform with auto-scaling, RDS PostgreSQL, and Grafana monitoring.