We are a consulting team designing a mobile-first ERPNext solution for a small manufacturing client in the alcohol industry. We are looking for an experienced ERPNext developer to help configure and customize an ERPNext-based system focused on: • Batch / lot–based production tracking • Container-based handling (totes & tanks) • Mixing / blending workflows • Bottling / packaging operations • Loss calculation and validation • Inventory reconciliation • CSV-based sales imports (no API integrations) This project may evolve into a long-term engagement if the initial phase is successful. ERPNext is strongly preferred. Alternative platforms will only be considered if they natively support batch traceability, inventory mass-balance validation, and manufacturing workflows. The system must be mobile-first. Daily users will operate the system exclusively on mobile phones (iOS & Android browsers). ⸻ Project Overview (High Level) Core Concepts • End-to-end batch and lot traceability • Multiple production stages (processing → mixing → bottling) • Support for multiple mixing tanks • Container-based workflows using numbered totes • Ability to add new products and SKUs in the future Production Logic • Internal transfers may be approximate and non-reportable • Bottling / packaging is the official measurement point • Losses are system-calculated, not manually entered • Batch closure triggers final loss calculation Automation & Validation • ABV calculation from density + temperature • Automatic alcohol-content calculations • Automatic dilution calculations • Hard-stop validations to prevent: • Output greater than input • Negative or impossible losses • Invalid batch states • Monthly validation of overall process loss within defined limits ⸻ User Interface Requirements • Extremely simple, phone-friendly UI • Custom pages with: • Large buttons • Minimal required fields • Plain language (no accounting or ERP jargon) • Floor staff should not interact with standard ERP menus ⸻ Reporting Requirements (High Level) The system must generate: • Input / intake logs • Production logs (with start & end time) • Mixing / blending logs • Daily bottling logs • Loss summaries (by batch and stage) • Inventory reports (system vs physical) • Sales summaries by internal SKU (from CSV imports) Exact report formats, calculations, and compliance-driven rules will be shared after initial qualification. ⸻ Required Experience • Strong ERPNext experience • Manufacturing + Inventory modules • Batch / lot traceability • Custom validation logic • Custom reporting (PDF / Excel) • CSV import handling • Mobile-first UI design