We have an existing GST compliance module integrated via Quicko/Sandbox as our GSP. GSTR-1 filing and GSTR-2A/2B retrieval are complete and working in production. We need an experienced integrator to complete the GSTR-3B filing flow end to end.
Scope of work
- Complete the GSTR-3B flow: SAVE → summary generation → Proceed to File → offset liability → file with EVC/DSC
- Debug an existing request-context rejection on the offset-liability (RETOFFSET) call
- Handle electronic cash and credit ledger retrieval and ITC set-off logic per GSTN utilisation rules
- Implement asynchronous response handling and status polling
- Error handling, retry logic and logging for GSTN downtime
- Documentation and handover
Required
- Demonstrable prior experience filing GSTR-3B through GST APIs (not just GSTR-1 or e-invoicing)
- Hands-on with a GSP wrapper — Quicko/Sandbox, Masters India, Cygnet, IRIS, ClearTax or similar
- Solid understanding of GSTN authentication: OTP session tokens, app key / SEK / EK encryption, token expiry handling
- Familiarity with GSTN error codes and the RETOFFSET request structure
- [Your backend stack — e.g. PHP/Laravel, Node.js, Python/Django]
Valuable to have
- Experience with e-way bill or e-invoicing (IRP) integration
- Prior work on Indian accounting or ERP products
Pay: ₹10,000.00 - ₹20,000.00 per week
Application Question(s)
- Which GSP platforms have you worked with, and on which return types?
- Walk us through the offset-liability call — what is sent, and what must happen before it?
- Your availability and expected rate (hourly or fixed for the scope above)