ERP-Tally Integration for Accounting & Inventory

We need a developer who can build a reliable integration between our ERP and Tally for automatic accounting and inventory synchronization.

Our Existing System
Backend: ASP.NET (C#)
Database: SQL Server
Frontend: AngularJS
ERP Modules: Sales, Purchase, Inventory, Customer Management, GST Billing
Required Integration Features
Sync Sales Invoice from ERP to Tally
Sync Purchase Voucher
Customer/Ledger Creation
Item/Stock Creation
GST & Tax Handling
Voucher Number Synchronization
Duplicate Voucher Validation
Bulk Invoice Sync
Real-time or Manual Sync Option
Error Log & Sync Status Tracking
Technical Requirements

Freelancer should have experience with:

Tally XML API
TallyPrime Integration
ASP.NET C#
SQL Server
HTTP/XML Request Handling
Voucher Creation & Alter XML
GST Accounting Structure
Preferred Experience
Previous Tally ERP integration projects
Knowledge of inventory and accounting workflows
Experience handling large invoice sync
Deliverables
Complete source code
Integration APIs/services
Documentation
Testing support
Deployment assistance
Project Type
Freelance / Contract Basis
Remote Work
To Apply

Please share:

Previous Tally integration work
Technologies used
Estimated timeline
Cost quotation

You can also mention if you have worked on:

TallyPrime Server
Multi-company sync
E-invoice / GST integration
Bi-directional sync between ERP and Tally