Modernizing a Legacy Marketplace & Supply Chain Platform
Replatforming an out-of-support, heavily customized PHP marketplace and supply chain system for a major Canadian retailer
Client: Confidential — major Canadian retailer, name withheld under NDA Industry: Retail / E-Commerce Duration: 12+ Months
The Challenge
Our client, a major Canadian retailer, ran its online marketplace and supply chain operations on a heavily customized PHP platform built years earlier. The underlying PHP version had reached end of support, leaving the platform without security patches and increasingly exposed to vulnerabilities. Deep, undocumented customizations made the system fragile to change, difficult to scale during peak retail periods, and dependent on a shrinking pool of developers who understood the legacy code. Supplier, inventory, and logistics integrations were brittle, and any misstep risked disrupting live order processing across the business.
Our Solution
C4 Cyber led a 12+ month modernization engagement to replatform the marketplace and supply chain system without disrupting live retail operations:
▪ Comprehensive Audit & Roadmap — full audit of the legacy codebase, dependencies, and custom marketplace/supply chain logic to map a safe, phased migration path.
▪ Phased Replatforming — incrementally migrated core marketplace and supply chain modules onto a modern, supported architecture, preserving business-critical customizations while retiring legacy tech debt.
▪ Zero-Downtime Migration Strategy — parallel-run and staged cutover approach to move live traffic without disrupting order processing, inventory sync, or supplier integrations.
▪ Modernized Integrations — rebuilt supplier, logistics, and inventory connections on secure, maintainable APIs, replacing brittle legacy integrations.
▪ Security Hardening — closed vulnerabilities inherent to running an unsupported PHP version, bringing the platform back onto a securely patchable foundation.
The Results
12+ Months
full replatforming delivered without disrupting live retail operations
Zero
critical outages during migration and cutover
60%
improvement in platform performance & scalability
Technology Used
Legacy PHP audit & migration · Modern supported application stack · Secure API integrations · Marketplace & supply chain systems · Zero-downtime deployment pipeline