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SCOPE GENERATED·complexity: [███████░░░] 7/10
PROJECTGST Filing Automation for Indian Freelancers
RATIONALEGST compliance is a recurring pain for 10M+ Indian freelancers and SMEs. A SaaS that auto-pulls invoices from accounting tools and pre-populates GSTR-1/3B filings can charge ₹499–₹999/month with very low churn. NestJS handles the complex computation logic cleanly; PostgreSQL stores filing history with full audit trail. Razorpay is mandatory for INR subscription billing.
TECH STACK
FrontendNext.js (App Router)
BackendNestJS
DatabasePostgreSQL
AuthSupabase Auth
HostingVercel + Railway
ExtrasRazorpay Subscriptions, GST Portal Sandbox API, Resend (email receipts)
MVP FEATURES
✓GSTIN registration and profile setup
✓Invoice upload (CSV, Tally XML, manual entry)
✓Automatic IGST / CGST / SGST computation
✓GSTR-1 and GSTR-3B draft generation
✓One-click filing via GST portal sandbox
✓Email + SMS reminders for filing deadlines
DEFERRED (v2)
○E-invoicing (IRN generation) for B2B transactions > Γé╣5 Cr
○CA / accountant multi-client dashboard
○Tally and Zoho Books two-way sync
TIMELINE
2 weeksAuth, onboarding & GSTIN verification
4 weeksInvoice ingestion & tax computation engine
3 weeksGST portal API integration & filing flow
2 weeksSubscription billing, reminders & polish
COST ESTIMATE
USD$14,000 – $22,000
INR₹13.1L – ₹20.5L
⚠ RISK FLAGS
!GST portal API has rate limits and frequent downtime windows ΓÇö build a retry queue from day one.
!Tax logic changes with every budget; architect the computation engine to be rule-driven, not hardcoded.
!GSTIN validation requires the GSTN sandbox, which needs a formal onboarding ΓÇö start the registration process in week 1.
SHARE YOUR SCOPE
Public link: stackpick.in/s/saas-gst-filing-automation-30k-a1b2
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