I need a ground-up ERP tailored for a construction company that ties daily site activity to back-office oversight in one place. The scope covers three core modules—Project Management, Inventory Management, and Financial Management—built as an integrated web application (modern PHP / Python / .NET stack is fine; MySQL or PostgreSQL on the back end). Core Modules ✔️ Dashboard (summary & reports) ✔️ Employee Management (HR) ✔️ Attendance & Timesheets ✔️ Payroll & Salary Slip ✔️ Invoicing & Billing ✔️ Inventory ✔️ Project Management ✔️ Accounts & Ledger ✔️ User Roles & Permissions Role-based access is essential. The system must clearly separate privileges for Admin, Project Manager, and aCCOUNTS users so each sees only the dashboards, reports, and data they require. Core expectations • Unified database schema that lets information flow seamlessly across the three modules. • Clean, responsive interface that works on laptops and tablets used on site. • Audit trails, attachment handling (drawings, invoices, delivery notes), and permission-based reporting. • API endpoints or webhooks so we can later plug in time-tracking or HR tools. Deliverable is a deployable application with source code, database scripts, and a brief hand-over guide. I will provide sample data and branding assets once the project starts and will be available for quick feedback rounds to keep development moving smoothly.