LocalPerks - Local Loyalty Coalition

Model: z-ai/glm-4.7
Status: Completed
Cost: $0.255
Tokens: 162,542
Started: 2026-01-05 14:39

Section 03: Technical Feasibility

VenturePulse Analysis

LocalPerks Architecture & Implementation Strategy

8
/ 10

Technical Achievability: High

The core functionality—points ledgers, QR scanning, and multi-tenant dashboards—is well-trodden territory. Modern Backend-as-a-Service (BaaS) platforms like Supabase provide robust authentication and real-time database capabilities out of the box, significantly reducing development time. The primary complexity lies not in the code, but in the financial logic (ledger integrity) and offline synchronization for merchants. Precedent exists in apps like Fivestars and Belly, proving the technical model works. Time to first prototype is estimated at 6-8 weeks for a skilled team.

Gap Analysis & Recommendations:
  • Gap: Offline merchant mode (internet outage in cafes) risks data loss.
  • Fix: Implement a local queue on the merchant device using React Native MMKV or SQLite, syncing to the backend upon reconnection.

Recommended Technology Stack

Layer Technology Rationale
Frontend (Web) Next.js 14 + Tailwind CSS + shadcn/ui Next.js offers SSR for SEO (discovery pages) and API routes for backend logic. Tailwind/shadcn provides a polished, enterprise-grade UI instantly.
Frontend (Mobile) React Native (Expo) Expo manages the heavy lifting of mobile build pipelines. Access to native camera (QR) and geolocation is seamless. Single codebase for iOS/Android.
Backend / DB Supabase (PostgreSQL) Postgres is non-negotiable for financial ledger integrity (ACID compliance). Supabase provides Auth, Realtime (subscriptions), and Storage, eliminating months of DevOps work.
AI / ML Layer OpenAI GPT-4o-mini + pgvector GPT-4o-mini is cost-effective for generating marketing copy. pgvector (native in Supabase) enables semantic search for "Discovery" recommendations based on user history.
Infrastructure Vercel (Web) + Expo EAS (Mobile) Vercel offers best-in-class Next.js hosting with preview deployments. EAS (Expo Application Services) handles over-the-air (OTA) updates for mobile apps.
Monitoring Sentry (Errors) + PostHog (Analytics) Sentry captures crash reports instantly. PostHog provides product analytics (funnels, retention) without the heavy cost of Amplitude/Mixpanel early on.

System Architecture

Consumer App
React Native (Expo)
- QR Display
- Wallet
- Discovery
Merchant Dashboard
Next.js Web
- QR Scan
- Redemption
- Analytics
↓ HTTPS / WebSocket ↓
API Gateway & Services (Node.js/Edge)
Auth | Ledger Logic | Settlement Engine
PostgreSQL
- Users
- Merchants
- Transactions
Object Storage
- Logos
- Receipts
Vector DB
- Embeddings
- Recommendations
Stripe (Payments)
OpenAI (Marketing)
SendGrid (Comms)

Feature Complexity Analysis

Feature Complexity Effort Dependencies Notes
Multi-tenant Auth (User vs Merchant) LOW 2-3 days Supabase Auth Use Row Level Security (RLS) for data isolation.
Points Ledger (Earn/Redeem) HIGH 1-2 weeks Postgres DB Transactions Critical. Must use DB transactions to prevent double-spending or sync errors.
QR Code Generation & Scanning MED 3-5 days Camera permissions Dynamic QR codes with expiring tokens prevent screenshots/reuse fraud.
Geo-location Discovery MED 4-6 days Mapbox/Google Maps API PostGIS extension in Postgres handles efficient distance queries.
Monthly Settlement Engine HIGH 1-2 weeks Stripe Connect Calculate redemption fees, batch payouts, generate tax invoices.
AI Marketing Copy Gen LOW 2-3 days OpenAI API Simple prompt engineering. Nice-to-have for MVP.

AI/ML Strategy (Enhancement Layer)

AI is not the core product but serves as a force multiplier for merchant marketing and consumer discovery.

Use Case 1: Merchant Marketing Assistant

Input: Merchant business type + promo goal.
Model: GPT-4o-mini (Low cost, fast).
Output: 3 variations of email copy and push notification text for coalition campaigns.

Use Case 2: Semantic Discovery

Input: User transaction history + business descriptions.
Model: pgvector (OpenAI text-embedding-3-small).
Output: "Recommended for you" businesses based on vibe/purchases, not just geography.

Cost Control: Estimated AI cost per merchant is <$0.50/month. We will cache common marketing prompts to avoid redundant API calls.

Data Strategy

Core Data Models

  • Users (Profile, Balance, Membership Tier)
  • Merchants (Settings, Redemption Rates, Location)
  • Transactions (Ledger entries: Earn/Redeem/Expire)
  • Coalitions (Network of merchants, shared rules)

Privacy & Compliance

PII Handling: Phone numbers (primary ID) and names are encrypted at rest in Postgres.
GDPR/CCPA: "Right to be Forgotten" API endpoint will anonymize user data and zero-out balance upon request (with liability waiver for unredeemed points).
Financial Data: Transaction logs are immutable append-only for audit trails.

Critical Integrations

Service Purpose Complexity Cost Criticality
Stripe Connect Payouts, Subscription Billing High % of volume + $/mo Must-have
Twilio SMS Verification (Auth) Low Pay-per-msg Must-have
Mapbox Storefront Mapping Medium Free tier generous Nice-to-have
OpenAI Marketing Copy Generation Low Usage based Future
Plaid Bank Verification (Merchants) Medium Per item Nice-to-have

Technology Risks & Mitigations

🔴

Ledger Inconsistency (Race Conditions)

HIGH SEVERITY

If a user tries to redeem points at two merchants simultaneously, or if a merchant scans a QR code with poor internet, the system might double-spend points or lose transactions.

Mitigation: Use PostgreSQL database transactions with row-level locking (SELECT FOR UPDATE) on the user's balance record. Implement idempotency keys for all API requests so retrying a failed scan doesn't double-award points.
🟡

QR Code Fraud (Screenshots)

MED SEVERITY

Users sharing screenshots of their QR code to allow friends to earn points on their account, or malicious actors copying codes.

Mitigation: Do not use static QR codes. Generate a dynamic, time-expiring token (valid for 30 seconds) on the consumer app that refreshes automatically. The merchant app validates the timestamp against the server.
🟡

Vendor Lock-in (Supabase)

MED SEVERITY

Heavy reliance on Supabase-specific Auth and Realtime features could make migrating to raw AWS/Azure difficult later if costs spike or features change.

Mitigation: Write business logic in standard Node.js API routes (or serverless functions) rather than Supabase Edge Functions where possible. Keep the data access layer abstracted. Since Supabase is just Postgres, migration is technically feasible, though effort-intensive.

Development Timeline (12 Weeks to MVP)

1

Phase 1: Foundation (Weeks 1-3)

  • Setup Supabase project (Schema, RLS policies).
  • Next.js & Expo boilerplate setup.
  • Authentication flow (Email/Phone) for both User & Merchant.
  • Basic Merchant Dashboard shell.
2

Phase 2: Core Ledger & QR (Weeks 4-7)

  • Implement Points Ledger API (Earn/Redeem logic with transactions).
  • Dynamic QR Code generation (Consumer) & Scanning (Merchant).
  • Real-time balance updates (Supabase Realtime).
  • Merchant Transaction History view.
3

Phase 3: Discovery & Polish (Weeks 8-10)

  • Consumer App: Map view and "Near Me" list.
  • Coalition Management logic (grouping merchants).
  • UI/UX Polish (shadcn/ui components).
  • Error handling and edge cases (offline mode).
4

Phase 4: Launch Prep (Weeks 11-12)

  • Stripe Connect integration (payouts).
  • Security audit (RLS check).
  • Deploy to Production (Vercel + EAS).
  • Alpha testing with 1 pilot coalition.

Skills & Team

Solo Feasibility

Verdict: Challenging. While possible, the dual-platform requirement (Native Mobile + Web Dashboard) and the critical nature of the financial ledger make a solo build risky for a 14-month runway.

Required Skills: React Native, Next.js, PostgreSQL, Stripe Connect.

Ideal Team (2-3 People)

  • Full Stack Engineer (Lead): Next.js, Supabase, Ledger Logic.
  • Mobile Engineer: React Native, Camera/Geo APIs.
  • Product/UX (Part-time or Founder): Figma design, testing.

Outsource Opportunities

UI Design: Can purchase a high-quality React Native template (e.g., UI Kit) to save weeks on styling.

Marketing Site: Use Webflow or a template for the public landing page to save engineering time.