Comprehensive ERP System Development

I'm seeking a skilled developer to build a robust web-based ERP system.
The system will run on a virtual linux server (ubuntu) or container IN A PROXMOX environment.
Database must be postgresql (running in a separat virtual server)
Application must run on desktop as well as tablet down to 12".

1. base platform (initial website with the login screen for the users). On this website widgets for the single modules should be created. So every module should be independent app. one widget should be settings, where users can be created and permission granted (admin, manager, engineer,...). Later, inside the setting app the configurations for the different modules will be added in tabs.

Main modules:
A. Contact module: create, search, modify contacts with all required data.
B. Inventory module: create, modify, delete items; show stock information for single parts (history of purchase, price, supplier), generate SKU number automatically. An item can be an assembly consisting of multiple items of the inventory.
C. Offer module: create/modify offers based on template, generate pdf.
D. Invoice module: create/modify invoice based on template, generate pdf.
E. Project module: create modify and delete projects, having a to do list for activities with persons assigned and status indication, showing a gantt overview and a budget overview.
F. Integration of CREO API from PTC to handle Creo design files (THIS WILL BE A SEPARATE PROJECT AFTERWARDS)

more details in the file, for each module a discussion is required to finalize exactly the module definition.

The above single modules will be used as milestones also for payment.

Ideal candidates should have:

- Expertise in both frontend and backend development.
- Proficiency in PostgreSQL.
- Experience with ERP systems and their various modules.
- Strong understanding of web application architecture and design.

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