Hello,
I am Albin John from India.
My suggestion is Odoo, Odoo is business management software including CRM, e-commerce, billing, accounting, manufacturing, warehouse, project management, and inventory management. The Community version is the LGPLv3 open source version, supplemented by the Enterprise version's proprietary features and services.
The technical architecture in a nutshell:
- Backend: Postgresql, Python 3 (Odoo 11.0 and up), XML
- Frontend: HTML, Javascript, QWeb (proprietary), XML
Odoo follows an MVC architecture. I need only customization charge 20USD/hr. Just google it you will find more details. If any help needed please contact me.