// build_guide
// How to build GST Invoice Automation SaaS for Indian Freelancers
Next.js provides excellent Indian market performance with server-side rendering. PostgreSQL handles complex GST calculations and invoice relationships reliably. Razorpay is essential for Indian payment processing with UPI support.
Complexity 7/10SaaS
// recommended_stack
FrontendNext.js 14 with TypeScript
BackendNode.js with Express/Fastify
DatabasePostgreSQL with Prisma ORM
AuthNextAuth.js with Google/email login
HostingVercel (frontend) + Railway (backend)
ExtraRazorpay integration
ExtraPDF generation (jsPDF)
ExtraEmail service (Resend)
ExtraGST rate calculation engine
// cost_and_timeline
USD min
$6,000
USD max
$12,000
INR min
₹5.0L
INR max
₹10.0L
Typical SaaS projects cost $1,800–$5,000 USD and take 6–8 weeks with an Indian dev team. See the full cost guide →
// timeline_breakdown
1 weekDiscovery & Design
6 weeksCore Development
2 weeksGST Integration & Testing
1 weekPayment Integration
1 weekAdmin Panel
1 weekTesting & Deployment
// mvp_features[]
## What to build in the MVP
-User registration and authentication
-Basic invoice creation with GST calculations
-Client management system
-PDF invoice generation with GST compliance
-Payment tracking and status updates
-Admin dashboard for user management
-Basic Razorpay payment integration
// risk_flags[]
## Engineering risks to plan for
!GST compliance complexity requires Indian tax law expertise
!Budget may be insufficient for full GST automation features
!Razorpay integration adds regulatory compliance overhead
!Short timeline conflicts with complex GST calculation requirements
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// related_resources