SmallFits - Point of Sale System
A comprehensive Point of Sale (POS) backend system designed for retail stores to manage sales, inventory, and daily operations. The system enables real-time transaction processing, multi-tab draft invoice management, and automated inventory tracking.
Private Repository
This repository is private and contains proprietary code. Code samples and architecture details available upon request during interviews.
Project Summary
Built a production-ready Point of Sale backend system with real-time inventory reservation, multi-tab transaction management, GST-compliant invoicing, and daily cash register operations, serving retail stores with concurrent sales processing.
Tech Stack
Key Features
Multi-tab Draft Invoice System with real-time inventory reservation
Daily Cash Register Management with denomination counting
Product Variant Management with barcode tracking
GST-Compliant Invoice Generation with S3 storage
Product Return & Credit Note System
Payment Processing with multi-method support
What Makes This Unique
Real-time Inventory Reservation preventing overselling
Editable Invoice System with daily register locking
Tab-based Architecture for concurrent transactions
Offline Customer Onboarding via phone number
Smart Discount Engine with multi-level calculations
Complexity & Challenges Solved
Concurrent Inventory Management with atomic reservations
Complex Discount Calculations with tax recalculation
Daily Register Reconciliation with automated counting
Payment Method Abstraction with unified processing
Return Processing Logic with partial returns
Timezone Handling for consistent date operations