Build Modular ERP From Scratch -- 2

I need an end-to-end, fully modular ERP developed from scratch. The system must launch with the following functional blocks already working together:

• Sales, CRM, and invoicing
• Inventory, purchasing, and warehouse management
• HR, payroll, and employee records
• POS, accounting, recruitment, WhatsApp lead capture, and basic AI-driven insights

Role-based access is critical from day one. Owners and senior managers need complete reporting with approval rights; office teams must handle sales, CRM, accounting, HR, and recruitment; store and warehouse staff should log into streamlined POS, stock, purchasing, and delivery screens.

I’m open on the tech stack as long as it is cloud-ready, API-friendly, and designed so new modules can be plugged in later without major refactoring. Source code, deployment scripts, and concise user documentation are part of the hand-over.

Acceptance criteria
1. Each module listed above runs from a single, coherent UI and shares a common data model.
2. Role permissions work exactly as described, with an admin panel for fine-tuning.
3. WhatsApp and lead integrations pull contacts directly into CRM, while AI suggestions surface next-best actions for sales reps.
4. System installs cleanly on a fresh cloud server using the provided scripts.
5. You deliver full source, docs, and a short video walkthrough.

If you have a proven track record building modular business software and can move quickly on a clear MVP, let’s talk timelines and milestones.