Re-Platforming a 15-Year-Old E-Commerce Monolith for a Department Store Group
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Problem
Monolith blocking every promotion
A 45-store regional department store chain sold online through a 15-year-old e-commerce monolith. Every price change or promotion needed a developer ticket, releases shipped once a quarter after weekend-long deployment freezes, seasonal traffic spikes caused outages, and the codebase had grown so entangled that no single engineer understood the checkout path end to end.
Solution
Incremental strangler-fig replatform
We refactored the platform incrementally using a strangler-fig approach rather than a risky big-bang rewrite. Catalogue, promotions, cart and checkout were carved out into separately deployable Node.js services behind a routing layer, a Next.js storefront replaced the server-rendered legacy front end, and automated CI/CD pipelines with feature flags replaced the quarterly release freeze.
Measurable Impact
What changed after launch
Release cycle shortened from one quarterly deployment to more than 20 production releases per month
Promotion setup moved from a 3-week developer ticket to same-day merchandiser self-service
Zero checkout downtime through two consecutive holiday peaks that had caused outages in prior years
Hosting and licensing costs reduced by 31% after the final monolith servers were retired
Tech & Tools Used
What powered the build
Ready to Build your Department Store Retail Business with Legacy Platform Refactoring
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