Financial Requisitions Management System Development

We are looking for an experienced developer to create a web-based Financial Requisitions Management System. The system will manage various requisitions (e.g., services, transportation, raw materials) with role-based access for users, approvers, and admins. Below are the key requirements:

Technical Requirements:

Web-based solution using modern frameworks (Flutter or ASP.NET Blazor).
Backend to use GraphQL with Node.js (TypeScript) or ASP.NET Core.
Authentication and authorization through MSAL, integrated with Microsoft Entra for SSO.
PostgreSQL database (SQL Server is not allowed).
Well-documented code or external documentation.
Fully localized frontend (default in English, translation-ready).
Functional Requirements:

Role-based access:
Users: Create, view, and edit their requisitions.
Approvers: Approve/reject requisitions with feedback.
Admins: Configure workflows and override locked fields.
Configurable approval workflows (e.g., CEO approval mandatory).
Integration with existing SQL Server data for financial records via the backend.
Additional Info:

Sample Excel structure and queries will be provided.
Responsive design required for both desktop and mobile.
Post-deployment support expected for minor adjustments.