Expert Required: Build ERP–Tally Middleware with Master Mapping & B2B/B2C Sales Sync -- 2

⚠️ Important – Read Before Applying

This project requires real, hands-on experience with Tally integrations. Generic ERP developers or copy-paste bidders will be ignored. Write "GOFFY" as first word of proposal.

Applications must answer the screening questions at the end of this post.

Project Overview

We are developing a production-grade middleware application to integrate our custom ERP with Tally.

The middleware will:

Allow master data mapping between ERP and Tally

Handle B2B and B2C sales data separately

Push GST-compliant sales vouchers into Tally

Receive confirmation/status from Tally for synced transactions

This is not a demo or POC. The solution must be stable, auditable, and scalable.

Scope of Work (Non-Negotiable)
1. Middleware Architecture

Standalone middleware application

Tech stack:

.NET Core (preferred) OR

Node.js (MERN backend acceptable)

Must be API-driven and configurable

2. Master Mapping (Critical Feature)

UI-based mapping between ERP and Tally for:

Customers / Parties

Items / Stock

Ledgers

GST / Tax structure

Hardcoded mappings are NOT acceptable

3. Sales Data Sync Logic

ERP contains two datasets:

B2B Sales

B2C Sales

Middleware must:

Allow user to select which dataset to sync

Create correct voucher structures in Tally

Maintain referential integrity

4. Tally Integration

Integration via Tally XML / Tally API

Push sales vouchers into Tally

Handle:

Validation errors

Duplicate prevention

Partial failures

5. Sync Confirmation & Audit Trail

Receive confirmation from Tally on successful sync

Log failed transactions with exact error messages

Maintain full audit trail (date, user, status, voucher ID)

What Will Get Your Proposal Rejected Instantly

No prior Tally integration experience

Generic “we can do this” proposals

No architecture explanation

Unrealistic timelines (e.g., 5–7 days)

Copy-paste company profiles

Mandatory Skills

Tally integration using XML / API

ERP-to-accounting system middleware

GST-compliant accounting flows

.NET Core or Node.js backend development

API security & error handling

Deliverables

Working middleware application

Source code with documentation

Deployment & configuration guide

Knowledge transfer session

Payment Terms

Milestone-based payment only

No advance payment without deliverables

Code ownership transferred upon final payment

Screening Questions (Answer ALL)

Proposals without these answers will be rejected.

Which version(s) of Tally have you integrated with before?

Have you implemented ERP → Tally sales voucher sync earlier? Explain briefly.

How will you handle master mapping between ERP and Tally?

How do you ensure GST compliance in Tally vouchers?

Which tech stack do you recommend (.NET or Node) and why?

Expected Timeline

Only serious estimates are acceptable.
Typical expected range: 6–10 weeks, depending on approach.

Who Should Apply

✔ Developers who have already built Tally integrations
✔ Teams experienced in accounting-domain middleware
✔ Professionals comfortable working with audit & finance teams

Tip for Posting

After posting, shortlist only bidders who:

Answer screening questions clearly

Mention Tally XML specifics

Talk about GST voucher structure

Share real integration challenges they faced