Problem

Highly trafficked checkout flow requiring reliability, performance, and accessibility at massive scale for samsclub.com.

Constraints

• Millions of users across web and mobile
• Revenue-critical flows with zero tolerance for downtime
• Strict accessibility and cross-browser requirements
• Incremental changes without disrupting existing functionality

Approach

• Built reusable React/Redux components for checkout flows
• Improved frontend architecture and state management
• Collaborated closely with Product, UX, and Analytics teams
• Ran A/B tests to validate improvements before rollout
• Implemented comprehensive error handling and monitoring

Impact

• Supported ~$90B annual revenue through reliable checkout
• Improved reliability and user experience metrics
• Created scalable architecture for long-term growth
• Reduced checkout abandonment through UX improvements

Technologies