E-commerce GST Compliance SaaS Creation

I am looking for an experienced PHP developer to build a web-based GST compliance SaaS platform targeted at Indian e-commerce sellers, chartered accountants, and accountants. The platform will help users convert their e-commerce platform reports (Amazon, Flipkart, Meesho, etc.) into GSTR-1 Excel and JSON files, perform 2A/2B reconciliation, and convert e-commerce data into Tally-importable XML — all through a clean, subscription-based web interface.

The reference product is gsttool.in. I want a similar platform built from scratch with the same core functionality.

-Required Tech Stack

- Backend: PHP 8.x (CodeIgniter or Laravel preferred)
- Database: MySQL
- Frontend: Bootstrap 5 + jQuery
- Excel Processing: PhpSpreadsheet library
- Payment Gateway: Razorpay (UPI, cards, netbanking, wallets)
- Hosting: Linux VPS (Apache/Nginx)

Core Modules to Build

1. User Authentication & Dashboard
- Register, login, email verification, forgot password
- User dashboard showing active tools, subscription status, usage history
- Admin panel: manage users, subscriptions, revenue reports

2. GST Online Seller Tool (Main Tool — Paid)
- User uploads e-commerce platform Excel report (Amazon, Flipkart, Meesho, Myntra, Snapdeal, Meesho, JioMart, etc. — minimum 10 platforms at launch)
- System reads and maps platform-specific columns to GST fields (GSTIN, invoice no., taxable value, IGST, CGST, SGST, HSN, place of supply)
- Classifies data into correct GSTR-1 sections: B2B, B2CS, CDNR, EXEMP, HSN Summary, Table 14
- Generates downloadable GSTR-1 Excel (government format) and GSTR-1 JSON (gst.gov.in compatible schema)
- Preview/statement screen before download

3. 2A/2B Reconciliation Tool (Free)
- User uploads a sample Excel file with purchase register + 2A/2B data
- System matches invoices by GSTIN + invoice number, flags mismatches
- Generates multi-tab Excel report: Amount Mismatched, Invoice Mismatched, Entry Pending, Return Pending, Matched, All Entry

4. eCom to Tally Tool (Paid)
- Reads e-commerce platform Excel
- Maps fields to TallyPrime XML voucher import format
- Generates downloadable XML file importable into Tally

5. Free Utility Tools
- GSTR-1 JSON to Excel converter
- GST Error Report checker
- GSTR-1 JSON validator
- Merge Excel files utility

6. Subscription & Payments
- Monthly and annual plans
- Razorpay integration (UPI, cards, netbanking, wallets)
- 30-day free trial for paid tools
- Auto-renewal and cancellation flow
- Referral/affiliate program with tracking

7. Support & Content
- Help center with article collections (can be simple custom-built)
- Contact/support form with email notification
- Blog section (basic, for SEO)

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Key Technical Requirements

- GSTR-1 JSON output must strictly follow the official gst.gov.in JSON schema so files upload without errors
- Column mappings for each e-commerce platform must be configurable (not hardcoded) so new platforms can be added easily from the admin panel
- All uploaded files must be stored securely and auto-deleted after processing
- SSL, proper input validation, and basic security hardening required
- Mobile-responsive UI


What We Will Provide

- Access to sample e-commerce platform Excel reports for each platform (Amazon tax report, Flipkart GST invoice report, Meesho tax report, etc.)
- Official GSTR-1 Excel template and JSON schema reference
- UI/UX reference (gsttool.in)
- Domain and hosting
- Razorpay account credentials
- Ongoing feedback during development


Deliverables

- Fully functional, hosted SaaS web application
- Source code with documentation
- Admin panel
- 2 weeks post-launch bug-fix support