// build_guide
// How to build VendorCash - Daily Cash Flow Tracker for Indian Street Vendors
React Native enables cross-platform deployment for broader reach among Indian vendors. PostgreSQL handles complex financial transactions while Redis caches frequent UPI queries. Firebase Auth provides seamless phone-based authentication familiar to Indian users.
Complexity 7/10Mobile App
// recommended_stack
FrontendReact Native
BackendNode.js with Express
DatabasePostgreSQL with Redis caching
AuthFirebase Auth with phone number verification
HostingAWS EC2 with RDS
ExtraRazorpay/PhonePe APIs
ExtraUPI reconciliation services
ExtraPush notifications
ExtraOffline-first architecture
// cost_and_timeline
USD min
$8,000
USD max
$15,000
INR min
₹6.7L
INR max
₹12.5L
Typical Mobile App projects cost $7,000–$24,000 USD and take 12–20 weeks with an Indian dev team. See the full cost guide →
// timeline_breakdown
2 weeksDiscovery & Design
8 weeksCore Development
3 weeksUPI Integration & Testing
2 weeksBeta Testing with Vendors
// mvp_features[]
## What to build in the MVP
-Phone number authentication
-Manual cash transaction logging
-UPI payment scanning via QR codes
-Basic daily/weekly cash flow reports
-Simple expense categorization
-Offline transaction storage with sync
-Hindi/English language support
// risk_flags[]
## Engineering risks to plan for
!UPI reconciliation APIs have usage limits and costs that may scale quickly
!Target users may have limited smartphone literacy requiring extensive UX testing
!Regulatory compliance for financial data storage in India adds complexity
!Offline-first architecture significantly increases development complexity
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// related_resources