Saks Fifth Avenue E-Commerce

A high-traffic fashion e-commerce checkout optimization and storefront speedup

Saks Fifth Avenue is a world-renowned luxury fashion retailer. Their legacy mobile checkout suffered from long processing delays, causing cart abandonments. We were tasked with optimizing the frontend customer journey.

We custom-developed a React-based modular checkout system integrated with modern payment APIs (Apple Pay, PayPal, and credit processors). By optimizing script execution, we slashed mobile time-to-interactive (TTI) by 1.8 seconds.

Project Overview & Challenge

With millions of visitors per day, reliability is critical. We built a robust test pipeline and focused on optimizing layout stability (reducing Cumulative Layout Shift) to keep user interactions smooth.

React
Checkout
E-Commerce

Our Custom Approach

We applied code-splitting, deferred non-critical scripts, and optimized bundle sizes. The resulting checkout system boosted mobile conversions by 15% and significantly reduced customer service checkout error logs.