Tumbas Point of Sale

A comprehensive POS system built to solve real inventory and financial management challenges for small retail businesses.

Problem

Toko kelontong kesulitan memanage inventory, supplier, dan customer secara manual. Pencatatan laba-rugi, hutang, dan piutang sering tidak akurat yang menyebabkan kerugian finansial.

Solution

Membangun web-based POS dengan real-time inventory tracking, automated financial reporting, dan role-based access control untuk memastikan akurasi data dan kemudahan operasional.

Architecture Decisions

• Chose Laravel + MySQL for rapid development and team familiarity — reducing learning curve while maintaining reliability
• Implemented queue-based stock updates to handle concurrent transactions without race conditions
• Used Redis caching for frequently accessed product data to speed up checkout process
• Server-rendered pages instead of SPA for simpler deployment and better reliability on slow connections

Trade-offs

• Prioritized reliability over cutting-edge tech stack — the business needed stability, not innovation
• Accepted longer initial dashboard load for complete data accuracy
• Chose synchronous stock validation over optimistic updates to prevent overselling

Lessons Learned

• Error handling upfront saves hours of debugging in production
• Database indexing is crucial — inventory queries went from 3s to 200ms
• Always test with realistic data volumes, not just sample data

Features

• Product and stock management
• Daily sales with barcode scanning
• Multi-user access with roles
• Sales and debt reports
• Customer and supplier tracking
• Return & discount handling
• Multi-outlet and offline support
• Real-time sales dashboard

Challenges Overcome

• Real-time stock updates during transactions
• Optimizing performance for large data
• Designing fast and intuitive cashier UI
• Secure role-based access control
• Integrating POS hardware (scanner, printer)