Web-Based Inventory & ERP Developer

Full-Stack Developer Needed: Custom Inventory, POS & Accounting ERP ----- Project Overview: We are looking for an experienced full-stack web developer (or agency) to build a custom, responsive, web-based Inventory, Billing, and Accounting Management System tailored for an Auto Parts Wholesale & Retail business. The system must handle high-volume parts cataloging, barcode scanning, dual-channel invoicing (GST Tax Invoices and Counter/Cash Invoices), inter-branch stock transfers, vendor/customer ledgers, and comprehensive financial/stock reporting. ----- Key Modules & Requirements: 1. Masters & Settings Configuration Catalog Masters: Product Categories, Sub-categories, Car Models compatibility, and Part Manufacturing Companies. Entity Masters: Customer directory, Vendor directory, Staff directory, and Mechanic/Technician profiles (with commission tracking). Location Masters: Warehouses and Warehouse Rack/Shelf locations. Financial & Compliance: Financial Year management, Multi-user roles & permission-based login, Business/Company profile, Bank account details, GST tax rates & HSN, and State codes. 2. Product & Inventory Management Product Catalog: Unique Part Number / SKU, UID, Car Model compatibility, Manufacturer/Company, Category, Sub-category, Rack location, Opening stock, and Reorder/Minimum stock alerts. Barcode Support: Barcode generation, barcode label printing, and instant scanning. Product Views: Detailed product view including images, current stock levels, and historical transaction logs. 3. Purchase Management Purchase Orders & Bills: Vendor selection, bill reference, itemized parts entry with barcode scanning, batch/part numbers, unit rates, and automatic GST calculation (CGST, SGST, IGST). Additional Costs: Packing & forwarding (P/F), transport cost, and vehicle tracking. Purchase Returns: Debit notes/returns management with stock reversals and vendor ledger adjustments. 4. Sales & Invoicing (Dual Channel) Standard Invoices (Tax / With Bill): Complete GST-compliant billing with barcode lookup, sequential auto-numbering, multi-tax tiers, mechanic selection & commission calculations, customer balance tracking, and print/PDF export formats. Invoice C (Cash / Estimate / Counter Bills): Streamlined invoice creation for retail/counter transactions without formal tax billing. Sales Returns: Credit notes handling with automated stock returns and customer balance refunds/adjustments. 5. Inventory Operations & Adjustments Stock Transfers: Inter-branch/shop stock transfer workflows (e.g., Shop 1 to Shop 2) with status tracking. Dead Stock / Write-offs: Marking damaged, obsolete, or unsellable stock. Barcode Generation Module: Bulk generation and printing for existing or incoming unlabeled items. 6. Accounting & Financial Entries Customer Transactions: Journal entries, balance adjustments, payment collection logs (Cash/Bank split). Vendor Transactions: Payments to suppliers, advance tracking, and expense entries. Cash & Bank Management: Unified cash/bank daybook and account reconciliations. 7. Reports & Analytics 8. Mobile Application Requirement A mobile application is also required for the business owner’s personal use. The app should work on Android and iPhone and connect securely to the same central system. Key mobile features: View live dashboards and reports: daily sales, purchases, cash/bank balance, stock value, low-stock items, pending customer balances, vendor balances, profit/loss, and branch-wise performance. Search products and check real-time stock, price, rack location, and transaction history. Create and share invoices directly from the phone, including barcode-based product lookup, customer selection, GST/non-GST invoice options, discounts, payments, and PDF/WhatsApp sharing. View invoice, payment, customer, vendor, and stock-transfer status. Owner-only access or separate mobile permissions with secure login, audit logs, and data protection. Inventory Reports: Opening vs. Closing stock, Minimum/Low stock alerts, Dead stock reports. Sales & Purchase Analytics: Sales report (Bill vs. Non-Bill), Purchase reports, Staff sales, Mechanic sales & commission logs, Packing/Forwarding & Freight cost tracking. Party Ledgers: Detailed Customer Ledgers, Vendor Ledgers, and Outstanding Balance Aging reports. Financial Statements: Profit & Loss statement, Daybook, and GST filing summaries. Audit & Security: User activity logs and audit trail. ----- Technical Expectations: Tech Stack: Modern, fast stack (e.g., React / Next.js / Vue on Frontend; Node.js / Python / Laravel on Backend; PostgreSQL / MariaDB / MySQL). *Please specify your recommended stack. Hardware Integration: Fast USB/Bluetooth barcode scanner integration and thermal/standard printer-friendly invoice templates. Database & Concurrency: ACID compliant, safe concurrent writes, prevent negative inventory unless allowed, and server-side GST tax rounding rules. Responsive UI: Clean, dense, desktop-first UI optimized for fast data entry via keyboard shortcuts. ----- Deliverables: 1. Complete source code repository with clear documentation and setup instructions. 2. Production-ready web app hosted on our server/cloud. 3. Clean, normalized database schema. 4. Testing suite covering critical accounting and stock workflows. ----- How to Apply: When submitting your proposal, please provide: 1. Examples or live demos of relevant ERP, POS, Inventory, or Accounting systems you have built. 2. Your proposed technology stack and database architecture. 3. Your estimated timeline and milestone breakdown. 4. Your fixed-price quote or hourly estimate for the project.