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)