orion/docs/project-roadmap/implementation_roadmap.md

Implementation Roadmap

Multi-Tenant Ecommerce Platform - Complete Development Guide

Last Updated: October 11, 2025
Project Status: Slice 1 In Progress (~75% complete)

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📚 Documentation Structure

Your complete vertical slice documentation is organized as follows:

docs/slices/
├── 00_slices_overview.md           ← Start here for overview
├── 00_implementation_roadmap.md    ← This file - your guide
├── 01_slice1_admin_vendor_foundation.md
├── 02_slice2_marketplace_import.md
├── 03_slice3_product_catalog.md
├── 04_slice4_customer_shopping.md
└── 05_slice5_order_processing.md

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🎯 Quick Start Guide

For Current Development (Slice 1)

1. ✅ Read 01_slice1_admin_vendor_foundation.md
2. ✅ Review what's marked as complete vs. in-progress
3. ⏳ Focus on vendor login and dashboard pages
4. ⏳ Complete testing checklist
5. ⏳ Deploy to staging

For Future Slices

1. Complete current slice 100%
2. Read next slice documentation
3. Set up backend (models, schemas, services, APIs)
4. Build frontend (Jinja2 templates + Alpine.js)
5. Test thoroughly
6. Move to next slice

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📊 Current Status Overview

Slice 1: Multi-Tenant Foundation (75% Complete)

✅ Completed

• Backend database models (User, Vendor, Role, VendorUser)
• Authentication system (JWT, bcrypt)
• Admin service layer (vendor creation with owner)
• Admin API endpoints (CRUD, dashboard)
• Vendor context middleware (subdomain + path detection)
• Admin login page (HTML + Alpine.js)
• Admin dashboard (HTML + Alpine.js)
• Admin vendor creation page (HTML + Alpine.js)

⏳ In Progress

• Vendor login page (frontend)
• Vendor dashboard page (frontend)
• Testing and debugging
• Deployment configuration

📋 To Do

• Complete vendor login/dashboard
• Full testing (see Slice 1 checklist)
• Documentation updates
• Staging deployment

Slices 2-5: Not Started

All future slices have complete documentation ready to implement.

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🗓️ Development Timeline

Week 1: Slice 1 - Foundation ⏳ CURRENT

Days 1-3: ✅ Backend complete
Days 4-5: ⏳ Frontend completion

Deliverable: Admin can create vendors, vendors can log in

Week 2: Slice 2 - Marketplace Import

Days 1-3: Backend (CSV import, Celery tasks, MarketplaceProduct model)
Days 4-5: Frontend (import UI with Alpine.js, status tracking)

Deliverable: Vendors can import products from Letzshop CSV

Week 3: Slice 3 - Product Catalog

Days 1-3: Backend (Product model, publishing, inventory)
Days 4-5: Frontend (product management, catalog UI)

Deliverable: Vendors can manage product catalog

Week 4: Slice 4 - Customer Shopping

Days 1-3: Backend (Customer model, Cart, public APIs)
Days 4-5: Frontend (shop pages, cart with Alpine.js)

Deliverable: Customers can browse and shop

Week 5: Slice 5 - Order Processing

Days 1-3: Backend (Order model, checkout, order management)
Days 4-5: Frontend (checkout flow, order history)

Deliverable: Complete order workflow, platform ready for production

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🎨 Technology Stack

Backend

• Framework: FastAPI (Python 3.11+)
• Database: PostgreSQL + SQLAlchemy ORM
• Authentication: JWT tokens + bcrypt
• Background Jobs: Celery + Redis/RabbitMQ
• API Docs: Auto-generated OpenAPI/Swagger

Frontend

• Templating: Jinja2 (server-side rendering)
• JavaScript: Alpine.js v3.x (15KB, CDN-based)
• CSS: Custom CSS with CSS variables
• AJAX: Fetch API (vanilla JavaScript)
• No Build Step: Everything runs directly in browser

Why This Stack?

• ✅ Alpine.js: Lightweight reactivity without build complexity
• ✅ Jinja2: Server-side rendering for SEO and performance
• ✅ No Build Step: Faster development, easier deployment
• ✅ FastAPI: Modern Python, async support, auto-docs
• ✅ PostgreSQL: Robust, reliable, feature-rich

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📋 Implementation Checklist

Use this checklist to track your progress across all slices:

Slice 1: Foundation

• Backend models created
• Authentication system working
• Admin service layer complete
• Admin API endpoints working
• Vendor context middleware working
• Admin login page created
• Admin dashboard created
• Admin vendor creation page created
• Vendor login page created
• Vendor dashboard page created
• All tests passing
• Deployed to staging

Slice 2: Marketplace Import

• MarketplaceProduct model
• MarketplaceImportJob model
• CSV processing service
• Celery tasks configured
• Import API endpoints
• Import UI pages
• Status tracking with Alpine.js
• All tests passing

Slice 3: Product Catalog

• Product model complete
• Inventory model complete
• Product service layer
• Publishing logic
• Product API endpoints
• Product management UI
• Catalog browsing
• All tests passing

Slice 4: Customer Shopping

• Customer model
• Cart model
• Customer service layer
• Cart service layer
• Public product APIs
• Shop homepage
• Product detail pages
• Shopping cart UI
• Customer registration/login
• All tests passing

Slice 5: Order Processing

• Order model
• OrderItem model
• Order service layer
• Checkout logic
• Order API endpoints
• Checkout UI (multi-step)
• Customer order history
• Vendor order management
• Email notifications
• Payment integration (Stripe)
• All tests passing
• Production ready

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🎯 Each Slice Must Include

Backend Checklist

• Database models defined
• Pydantic schemas created
• Service layer implemented
• API endpoints created
• Exception handling added
• Database migrations applied
• Unit tests written
• Integration tests written

Frontend Checklist

• Jinja2 templates created
• Alpine.js components implemented
• CSS styling applied
• API integration working
• Loading states added
• Error handling added
• Mobile responsive
• Browser tested (Chrome, Firefox, Safari)

Documentation Checklist

• Slice documentation updated
• API endpoints documented
• Frontend components documented
• Testing checklist completed
• Known issues documented
• Next steps identified

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🔧 Development Workflow

Starting a New Slice

1. Read Documentation

   # Open the slice markdown file
   code docs/slices/0X_sliceX_name.md
   

2. Set Up Backend

   # Create database models
   # Create Pydantic schema
   # Implement service layer
   # Create API endpoints
   # Write tests
   

3. Set Up Frontend

   # Create Jinja2 templates
   # Add Alpine.js components
   # Style with CSS
   # Test in browser
   

4. Test Thoroughly

   # Run backend tests
   pytest tests/
   
   # Manual testing
   # Use testing checklist in slice docs
   

5. Deploy & Demo

   # Deploy to staging
   # Demo to stakeholders
   # Gather feedback
   

Daily Development Flow

Morning

• Review slice documentation
• Identify today's goals (backend or frontend)
• Check testing checklist

During Development

• Follow code patterns from slice docs
• Use Alpine.js examples provided
• Keep vendor isolation in mind
• Test incrementally

End of Day

• Update slice documentation with progress
• Mark completed items in checklist
• Note any blockers or issues
• Commit code with meaningful messages

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🎨 Alpine.js Patterns

Basic Component Pattern

function myComponent() {
    return {
        // State
        data: [],
        loading: false,
        error: null,
        
        // Lifecycle
        init() {
            this.loadData();
        },
        
        // Methods
        async loadData() {
            this.loading = true;
            try {
                this.data = await apiClient.get('/api/endpoint');
            } catch (error) {
                this.error = error.message;
            } finally {
                this.loading = false;
            }
        }
    }
}

Template Usage

<div x-data="myComponent()" x-init="init()">
    <div x-show="loading">Loading...</div>
    <div x-show="error" x-text="error"></div>
    <div x-show="!loading && !error">
        <template x-for="item in data" :key="item.id">
            <div x-text="item.name"></div>
        </template>
    </div>
</div>

Common Directives

• x-data - Component state
• x-init - Initialization
• x-show - Toggle visibility
• x-if - Conditional rendering
• x-for - Loop through arrays
• x-model - Two-way binding
• @click - Event handling
• :class - Dynamic classes
• x-text - Text content
• x-html - HTML content

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📚 Key Resources

Documentation Files

• 00_slices_overview.md - Complete overview
• 01_slice1_admin_vendor_foundation.md - Current work
• ../quick_start_guide.md - Setup guide
• ../css_structure_guide.txt - CSS organization
• ../css_quick_reference.txt - CSS usage
• ../12.project_readme_final.md - Complete README

External Resources

• Alpine.js Documentation
• FastAPI Documentation
• Jinja2 Documentation
• SQLAlchemy Documentation

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🚨 Common Pitfalls to Avoid

Backend

• ❌ Forgetting vendor isolation in queries
• ❌ Not validating vendor_id in API endpoints
• ❌ Skipping database indexes
• ❌ Not handling edge cases
• ❌ Missing error handling

Frontend

• ❌ Not handling loading states
• ❌ Not displaying error messages
• ❌ Forgetting mobile responsiveness
• ❌ Not testing in multiple browsers
• ❌ Mixing vendor contexts

General

• ❌ Skipping tests
• ❌ Not updating documentation
• ❌ Moving to next slice before completing current
• ❌ Not following naming conventions
• ❌ Committing without testing

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✅ Quality Gates

Before moving to the next slice, ensure:

1. All Features Complete

   • All user stories implemented
   • All acceptance criteria met
   • All API endpoints working

2. All Tests Pass

   • Backend unit tests
   • Backend integration tests
   • Frontend manual testing
   • Security testing (vendor isolation)

3. Documentation Updated

   • Slice documentation current
   • API docs updated
   • Testing checklist completed

4. Code Quality

   • Follows naming conventions
   • No console errors
   • No security vulnerabilities
   • Performance acceptable

5. Stakeholder Approval

   • Demo completed
   • Feedback incorporated
   • Sign-off received

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🎉 Success Metrics

After Slice 1

• ✅ Admin can create vendors
• ✅ Vendors can log in
• ✅ Vendor isolation works
• ✅ Context detection works

After Slice 2

• ✅ Vendors can import CSVs
• ✅ Background processing works
• ✅ Import tracking functional

After Slice 3

• ✅ Products published to catalog
• ✅ Inventory management working
• ✅ Product customization enabled

After Slice 4

• ✅ Customers can browse products
• ✅ Shopping cart functional
• ✅ Customer accounts working

After Slice 5

• ✅ Complete checkout workflow
• ✅ Order management operational
• ✅ Platform production-ready!

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🚀 Ready to Start?

Current Focus: Complete Slice 1

Your immediate next steps:

1. ✅ Read 01_slice1_admin_vendor_foundation.md
2. ⏳ Complete vendor login page (templates/vendor/login.html)
3. ⏳ Complete vendor dashboard (templates/vendor/dashboard.html)
4. ⏳ Test complete admin → vendor flow
5. ⏳ Check all items in Slice 1 testing checklist
6. ⏳ Deploy to staging
7. ⏳ Demo to stakeholders
8. ✅ Move to Slice 2

Need Help?

• Check the slice documentation for detailed implementation
• Review Alpine.js examples in the docs
• Look at CSS guides for styling
• Test frequently and incrementally
• Update documentation as you progress

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💡 Pro Tips

1. Work Incrementally: Complete one component at a time
2. Test Continuously: Don't wait until the end to test
3. Follow Patterns: Use the examples in slice documentation
4. Document as You Go: Update docs while code is fresh
5. Ask for Reviews: Get feedback early and often
6. Celebrate Progress: Each completed slice is a milestone!

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📞 Support

If you need assistance:

• Review the slice-specific documentation
• Check the testing checklists
• Look at the example code provided
• Refer to the technology stack documentation

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Ready to build an amazing multi-tenant ecommerce platform?

Start with: 01_slice1_admin_vendor_foundation.md

You've got this! 🚀