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Enterprise Legacy-to-Cloud Marketplace Transformation

Word of Mouth Marketplace Rescue

A “live-heart transplant” modernization: decouple a legacy PHP/jQuery marketplace into a headless React/Node ecosystem with business continuity preserved end-to-end.

The Challenge

A national-scale marketplace (Word of Mouth) was operating on a technical-debt heavy legacy stack (PHP/jQuery). The system suffered 503 errors during peak traffic, and new feature deployment took weeks.

This was a live-heart transplant: modernize the core architecture without a second of downtime for 100,000+ active users. That required incremental cutovers, safe routing between old and new systems, and continuous verification that performance and search stayed stable throughout the migration.

Quick Stats

  • Modernization: Strangler Fig
  • Search: PostgreSQL + Elasticsearch
  • Edge: WAF/CDN hardening
  • Impact: 10x velocity; 60% performance lift; zero downtime

The Solution

We implemented the Strangler Fig pattern, gradually wrapping the legacy monolith in a modern React/Node ecosystem. By decoupling the frontend from the backend, we moved to a headless architecture that allowed independent scaling of services.

The migration shipped value continuously: new features landed in the modern stack, traffic was routed safely via gateway boundaries, and legacy components were retired incrementally. The result was restored developer velocity, improved Core Web Vitals, and a platform that could scale nationally.

Technical Approach

  • Database normalization & indexing: Optimized a 500GB SQL database, reducing query times from 8s to <200ms.
  • CI/CD automation: GitHub Actions + automated staging environments to enforce regression testing before production pushes.

Technical Details

Architecture

Next.js (SSG/ISR) → NestJS (Microservices) → PostgreSQL + Elasticsearch

Integrations

Stripe Connect (payouts), AWS S3 (media), Cloudflare (WAF/CDN).

Security

OIDC/OAuth 2.0 modernization; rate limiting; SQL injection protection at the API gateway level.

AI Features

Automated content moderation (“Review Guardian”) flags fraudulent/non-compliant reviews before publish.

Results & Impact

  • 10x developer velocity: new features ship in days.
  • 60% performance lift: improved Core Web Vitals (LCP/FID).
  • Zero migration downtime: 100% business continuity during the 6-month modernization.