I’m putting together a lightweight, open-source billing web /IOS/Android app and need a developer who can deliver a first working version I can share publicly. Core flow • Secure login page with user/role management. • Initial business-type picker (Retail or Services) that stores the choice in the user profile. • Separate dashboards for each type, showing a quick summary of today’s sales, expenses, and outstanding credits. Key modules 1. Billing & invoicing – create, edit, and save invoices; one-click “Send bill to WhatsApp” using the official WhatsApp Cloud API or an equally reliable gateway. 2. Reports – downloadable Sales, Expense, and Customer reports (CSV or PDF). 3. Creditors – simple ledger to track who owes what and due dates. 4. Expenses manager – log daily expenses and have them reflected instantly in the dashboard and reports. Project expectations • Clean, readable code under an OSI-approved licence. • Clear setup guide (Docker, or step-by-step commands) so anyone can run it locally. • Modular structure that lets me add more business types later without rewriting everything. • Basic but responsive UI—Bootstrap, Tailwind, or similar is fine. Deliverables - Source code repository with commit history - Database schema or migration scripts - Brief README covering installation, environment vars, and how to trigger WhatsApp sending in a sandbox With the current budget I’m aiming for a minimal viable build: solid authentication, the two dashboards, functional invoice generation, WhatsApp send, and the three report downloads. If you can get that done efficiently, we’ll plan phase two together. want to make for web, ios , android and crm...