exporter

byTryo

Act as an Expert Android Developer and Systems Architect. I want to build a B2B Android application for domestic trading and supply chain management in India. The primary goal of the app is to help me source products at the lowest wholesale price from specific regions (especially Maharashtra) and sell them at the highest profitable margin in target regions. ​Please suggest the best tech stack (e.g., Kotlin, Jetpack Compose, Firebase/Supabase) and provide the architecture, database schema, and core code implementations for the following modules: 1. Sourcing & Target Location Engine * Source Filter: Cascading dropdowns (State -> District -> City -> Village) to find where to buy. * Target Filter: Cascading dropdowns (State -> District -> City -> Village) to find profitable selling locations. * Product Mapping: Display locally abundant products based on the source location (e.g., Sugar, Rice, Wheat, Cotton, Raisins, Dry Fruits, Fresh Fruits, Electronic Items). 2. Live Market Dashboard * A dynamic dashboard displaying commodities with columns for Live Wholesale Price and Live Retail Price. * Visual UI indicators (green/red tickers) for real-time price fluctuations. * An algorithm to highlight the absolute lowest buying price locations. * Integration Strategy: How to integrate the Govt of India's e-NAM (National Agriculture Market) API for live APMC Mandi prices. 3. B2B Directory & Contacts * A searchable directory with contacts and addresses for Buyers, Wholesalers, APMC Mandis, Local Markets, Retailers, Distributors, Local Farmers, and Manufacturing Companies. 4. Trade Margin & Freight Calculator * Margin Inputs: Sourcing price, targeted selling price, and total quantity. * Logistics Inputs: Calculate truck/container tonnage limits based on commodity type (volumetric vs. dead weight) and estimate freight costs per kilometer. * Outputs: Total Profit, Total Loss, and Marginal Profit/Loss percentages. 5. Document Vault & OCR Invoice Scanner * A secure vault for compliance files like IEC (Import Export Code), DGFT certificates, and GST registrations. * An OCR (Optical Character Recognition) integration (e.g., ML Kit) to scan physical Mandi receipts and E-way bills, extracting the date, amount, and dealer name. 6. Digital Ledger (Khata) & Payment Tracker * A B2B accounting screen to track transactions (Advance Received, Pending Dues, Completed Payments) with specific buyers/sellers. 7. Multilingual Support * Implementation strategy for dynamic language switching in Jetpack Compose (supporting English, Marathi, and Hindi) for local farmers and traders. Deliverables required from you: 1. A high-level system architecture and unified database schema (SQL/NoSQL) handling locations, users, live prices, shipments, ledgers, and documents. 2. Jetpack Compose UI code for the Live Market Dashboard (with animations) and the Document Scanner screen. 3. The logic/code for the Trade Margin & Freight Calculator. 4. Recommendations for third-party OCR libraries and APIs for live Indian agricultural data.