Developed a multi-tenant Point of Sale system serving multiple clients. Built with TypeScript and Express.js backend, Qwik frontend framework, and PostgreSQL with Drizzle ORM. Features include inventory tracking with IMEI serialization, multi-store stock transfers, cash drawer management, purchase order workflows, employee time tracking with scheduling, and comprehensive reporting (commission, aged inventory, invoicing). Implements role-based access control (RBAC) with hierarchical user management and granular permissions. Integrated AWS Bedrock for automated contract PDF parsing, reducing data entry time from 5 minutes to 30 seconds per contract. The system supports complex telecom contract billing with device financing, service plans, add-ons, and automated invoice generation.

Enterprise POS system serving multiple clients with inventory management, order processing, and contract billing.

Multi-Tenant POS System

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.

Real-time delivery coordination microservice built with Go, handling driver tracking, route optimization, and automated payouts.

Projects tagged as "postgresql"