agro_b2b.md

Agro B2B Marketplace — MVP Architecture & Development Plan

Date: October 06, 2025

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🔍 Overview

This document provides the full architecture, recommended tech stack, infrastructure plan, and cost estimates for developing the Agro B2B Marketplace MVP — a B2B wholesale agro-marketplace with escrow and KYC verification.

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🧩 Core MVP Requirements

1. Admin-Unlocked SKUs

• Admin defines SKUs and categories.
• Vendors can only list from approved SKUs.
• Buyers search/filter only approved categories.

2. KYC for Buyers and Sellers

• Upload CAC/ID verification.
• Admin dashboard for verification.
• Verified/Unverified badges.

3. Escrow (Trust Accounting)

• Buyer pays via PSP to escrow.
• Auto or manual release after confirmation.
• Admin can resolve disputes or refunds.

4. Seller Tiers

• Tier 3 (New) → Tier 2 (Verified) → Tier 1 (Certified).
• Tier displayed on storefront.

5. Ratings & Metrics

• 1–5 star post-delivery ratings.
• Auto-computed stats: On-time %, Dispute %, # of Orders.

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⚙️ Phase 2 (Should-Have Features)

• RFQ/RFP System: Buyers post RFQs; sellers respond with quotes.
• Motivated Seller: Discount flag and alert system.
• Farmer Proxy Management: Agents onboard and manage farmers with commissions.

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🧱 Architecture Blueprint

High-Level System Architecture

                ┌────────────────────────┐
                │        CLIENTS         │
                ├────────────────────────┤
                │ Buyers / Sellers       │
                │ Field Agents / Admins  │
                └──────────┬─────────────┘
                           │
                           ▼
        ┌────────────────────────────────────────┐
        │           API GATEWAY / BACKEND        │
        │────────────────────────────────────────│
        │ Auth Service (JWT, RBAC)               │
        │ User, KYC, Product, Escrow Services    │
        │ Transaction, Notification, Rating APIs │
        │ Admin Tools, RFQ Management            │
        └──────────┬─────────────┬───────────────┘
                   │             │
                   ▼             ▼
        ┌─────────────────┐   ┌─────────────────┐
        │ DATABASE (SQL)  │   │ STORAGE (S3)    │
        │ PostgreSQL       │   │ Docs, images    │
        └─────────────────┘   └─────────────────┘
                   │
                   ▼
        ┌────────────────────────────┐
        │ WORKERS / JOB QUEUE        │
        │ (Redis + BullMQ / Celery)  │
        │ - Escrow release timers    │
        │ - Tier updates             │
        │ - Notifications            │
        └────────────────────────────┘
                   │
                   ▼
        ┌────────────────────────────┐
        │ THIRD PARTY INTEGRATIONS   │
        │ Paystack / Flutterwave     │
        │ VerifyMe / Dojah (KYC)     │
        │ Twilio / WhatsApp / Email  │
        └────────────────────────────┘

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🧠 Database ERD Summary

Entity	Relationships	Description
User	1→Many Listings, Transactions	Buyer, Seller, Agent, Admin
KYC	1→1 User	Stores docs, verification status
Listing	Many→1 Seller	Vendor product listing
Product_SKU	1→Many Listings	Admin-controlled SKU list
Transaction	1→1 Escrow	Buyer-seller transaction
Escrow	1→1 Transaction	Payment tracking
Rating	Many→1 Seller	Buyer feedback
RFQ	1→Many Quotes	Buyer procurement request
Quote	Many→1 Seller	Seller offer response
Tier	1→1 Seller	Verification/compliance tier
Notification	1→1 User	Event-based alerts

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🧰 Recommended Stack

Frontend

Layer	Stack	Reason
Web	Next.js (React)	SEO-friendly, modern UI
Mobile	React Native (optional)	Shared logic from web
Styling	Tailwind CSS	Rapid prototyping

Backend

Component	Stack	Reason
Core API	NestJS / Django REST Framework	Modular, scalable
Database	PostgreSQL	Reliable, relational
Storage	AWS S3 / Cloudinary	Secure doc storage
Queue	Redis (BullMQ/Celery)	Async jobs
Notifications	Twilio / WhatsApp / SendGrid	Omni-channel alerts
Payment	Paystack / Flutterwave	Escrow + split payouts
Auth	JWT + RBAC	Multi-role security

Infrastructure

Layer	Recommendation
API Hosting	Render / Railway / AWS ECS
Database	AWS RDS / Supabase
CDN	Cloudflare
CI/CD	GitHub Actions
Monitoring	Sentry / Datadog

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🧭 Timeline (4-Month MVP Plan)

Phase	Duration	Deliverables
Phase 1 – Core MVP	8–10 weeks	KYC, Escrow, Listings, Tiers, Ratings
Phase 2 – RFQ + Proxy + Motivated Sellers	6 weeks	RFQ + Agent modules
Phase 3 – Admin Tools & Dashboard	3 weeks	KYC admin, escrow management, disputes
Total	≈ 4 months	Ready for pilot launch

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👥 Team Composition & Cost Breakdown

Role	Responsibility	Duration	Cost/Month	Total
Tech Lead / Architect	System design, integrations	4 mo	$2,500	$10,000
Backend Engineer	APIs, DB, Escrow logic	4 mo	$2,000	$8,000
Frontend Engineer	Web app (Next.js)	4 mo	$1,800	$7,200
UI/UX Designer	Wireframes & flows	1 mo	$1,200	$1,200
DevOps Engineer	CI/CD, infra setup	1 mo	$1,500	$1,500
QA Tester	Manual & API testing	1.5 mo	$1,200	$1,800
Project Manager	Agile sprints, reporting	4 mo	$1,500	$6,000

💰 Total Development Cost: ≈ $35,700

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💵 Infrastructure Costs (Monthly)

Service	Provider	Cost
Hosting / API	Render / AWS EC2	$80–$150
Database	RDS / Railway	$50
File Storage	S3 / Cloudinary	$20
Redis Queue	Upstash	$20
Notifications	Twilio / Termii	$30–$80
Monitoring	Sentry / Logtail	$20
Domain + SSL	Cloudflare / Namecheap	$10
Total		$250–$350/month

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🧾 Total MVP Budget

Category	Cost
Development (Team)	$35,700
Infra (4 months)	$1,200
KYC + Escrow setup	$500
Total MVP	≈ $37,500 USD

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🔮 Scalability Roadmap

• Add AI Fraud Scoring for KYC/transactions.
• Enable multi-currency wallets (NGN, GHS, USD).
• Build offline agent app / POS onboarding.
• Shift to event-driven architecture (Kafka/NATS) post-MVP.

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Prepared by: ChatGPT (GPT-5)
For: Agro B2B Marketplace — MVP Planning
Founder: Richard Amatokwu