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Mission Report • Multi-vendor marketplace engineering

A Marketplace Operating System — Built on Magento

Multi-vendor catalog, location-aware delivery, vendor dashboards, assisted selling, push notifications, and a 97-score PWA storefront — all connected through a modular GraphQL architecture.

Multi-app architecture and operational rollout UK Delivery Confidential marketplace operator
Frontend apps

4 applications

GraphQL scope

80+ operations

Lighthouse

97 / 96 / 100 / 100

Challenge

Built for marketplace complexity, not single-store ecommerce

The scope combined multi-vendor catalog and offer controls, hyperlocal delivery orchestration, vendor-scoped operations, assisted POS/OOB journeys, role-based permissions, push notifications, and auditable GraphQL contracts across applications.

Platform visual

Challenge

Architecture-led delivery across applications, GraphQL contracts, and operational controls.

Solution

Magento extended into a modular marketplace operating platform

We connected Magento backend modules, Vendor Dashboard, POS workflows, OOB assisted ordering, and a customer PWA through one GraphQL layer running on MariaDB, Redis, and OpenSearch.

Platform visual

Solution / Architecture

Architecture-led delivery across applications, GraphQL contracts, and operational controls.

Magento Marketplace Backend

Backend domain modules for governance and scale

Delivery included vendor profiles and location settings, offers/pricing/inventory/tier pricing, vendor-scoped orders, hyperlocal shipping logic, assisted operations, communications, analytics APIs, admin ACLs, cron automation, and 80+ GraphQL operations.

Platform visual

Magento Marketplace Backend

Architecture-led delivery across applications, GraphQL contracts, and operational controls.

Architecture Diagram

Application and infrastructure flow

Customer PWA · Vendor Dashboard · POS App · OOB Admin App
↓
GraphQL API Layer
↓
Magento Marketplace Backend Modules
↓
MariaDB · Redis Cache · OpenSearch
Delivery Surfaces

Operational delivery across three interfaces

Vendor Dashboard

Vendor operating control for daily execution and team accountability.

  • Order queues and SLA visibility
  • Offer, stock, and pricing controls
  • Analytics snapshots and insight drilldowns
  • Team permissions and subaccount roles

POS / OOB Assisted Apps

Assisted-selling workflows for in-store and operational support journeys.

  • Assisted carting and buyer lookup
  • Vendor-context channel switching
  • Order recovery and support handling
  • Channel-aware fulfilment transitions

Customer PWA

Installable marketplace experience with high-speed, mobile-first execution.

  • Install support on iOS and Android
  • Single-page checkout and vendor comparison
  • Location-aware product discovery
  • Push notifications and service-worker support
PWA Storefront

Installable commerce experience with mobile-first speed

Ridley's Local Magento PWA storefront on mobile and desktop
Performance Results

Measured performance and capability outcomes

Performance 97 / 100
Accessibility 96 / 100
Best Practices 100 / 100
SEO 100 / 100

GraphQL speed comparison

Before

6,391ms

After

~247ms

PWA install support: iOS + Android
Push notifications: vendors + customers
Image optimisation: AVIF/WebP with CDN caching
Security and Permissions

Layered access control for marketplace governance

Access and identity

  • Vendor-scoped GraphQL access
  • Token-based authentication
  • OTP / second-factor-ready login

Permissions and governance

  • Role-based vendor subaccounts
  • Owner-only sensitive settings
  • Admin ACL segmentation

Safe execution

  • Middleware-protected routes
  • Server-side permission enforcement
  • Audited support workflows
Operational Resilience

Reliability patterns across jobs, messaging, and data movement

Scheduled operations

  • Scheduled insight rebuilds
  • Geocode and heatmap refreshes
  • Communications delivery

Delivery reliability

  • Push notification outbox processing
  • Retry-aware delivery patterns
  • GraphQL error normalisation

Data and cache stability

  • Import/export dry-run validation
  • Redis caching improvements
  • Operational recovery readiness
Business Value & Key Numbers

What changed for the business

The operating model improved onboarding speed, vendor self-service, performance visibility, assisted-commerce readiness, and governance while maintaining scalable GraphQL contracts and an app-like customer journey without app-store distribution.

Marketplace domain areas

10+

GraphQL operations

80+

Frontend applications

4

Lighthouse score profile

97 / 96 / 100 / 100

GraphQL speed improvement

6,391ms → ~247ms

Push notifications

Vendors + customers

Planning a marketplace build?

Let’s map architecture, controls, and delivery workflows before sprint execution.

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