How vStellar Ensured a Bug-Free Shopping Experience for Kart

Client Overview

A rapidly expanding e-commerce retailer (Kart) was gearing up for its largest Black Friday sale. With traffic expected to spike by 300%, the team faced the challenge of ensuring their newly introduced one-click checkout feature worked seamlessly across multiple devices and browsers. Manual testing was proving inadequate, with slow iterations and limited coverage leaving critical gaps in their QA process.

Objectives

• Ensure Platform Stability: Handle significant traffic spikes without crashes or performance issues
• Deliver Flawless New Features: Validate the one-click checkout and personalized recommendation features across devices and browsers
• Reduce QA Timelines: Accelerate the testing process to meet the tight Black Friday launch deadline.
• Enhance User Experience: Eliminate UI bugs and inconsistencies to maintain a seamless shopping experience

The Solution

It turned to vStellar to automate their testing workflows, enabling faster and more thorough validation of their system under high traffic and complex user scenarios.

Scalable Testing Across Devices

• vStellar configured automated UI tests to run simultaneously on 20+ devices and browsers, including real-world mobile devices and simulators.
• These tests validated the functionality of checkout flows, payment gateways, and personalized recommendations, ensuring a flawless user experience.

Advanced Performance Monitoring

• Using vStellar’s performance testing, the team simulated Black Friday traffic scenarios, identifying bottlenecks early in the database and server response times
• Tests were able to stress-test up to 3x the normal user load, preparing the system for peak traffic.

Integration with CI/CD Pipelines

• By integrating testing directly into their CI/CD pipeline, every code deployment automatically triggered regression tests, reducing the risk of last-minute surprises.
• New tests leveraged vStellar’s DOM diffing support to detect even subtle UI inconsistencies across browsers, including layout misalignments and button overlaps.

Mobile-Specific Optimizations

• Automated tests for mobile platforms validated the one-click checkout feature under real-world network conditions, such as 3G/4G speeds.
• These tests ensured consistent branding, button placements, and error-free flows for users across different operating systems and screen sizes.

Business Benefits

• Improved Testing Flexibility: Automated cross-browser testing provided extensive coverage, eliminating the need for additional testing resources.
• Faster Bug Resolution: Early detection and real-time reporting reduced debugging time by 40%, allowing the team to focus on customer-centric improvements.
• Cost-Effective Scaling: Automation enabled the QA team to scale testing capacity without increasing operational costs.
• Increased Feature Confidence: Rigorous testing gave developers confidence in the stability of new features, reducing rollback risks.

The Results

• 99% Pass Rate: Regression tests for the one-click checkout feature achieved a near-perfect pass rate in the first sprint, ensuring stability before the big event.
• Faster Testing Cycles: Parallel execution of UI and functional tests reduced testing time by 70%, enabling rapid iterations and fixes.
• Seamless Performance: Black Friday traffic surged by 300%, yet the platform maintained zero downtime and sub-2 second page load speeds.
• Revenue Boost: Sales revenue increased by 35%, driven by a smooth shopping experience and confident user transactions.

Client Quote

“With vStellar, we resolved performance bottlenecks and ensured a consistent experience across all devices. The integration into our pipeline was seamless, and we were ready for Black Friday in record time.”

Kart

CTO

Impact

• Delivered flawless UI and system performance during the highest traffic period of the year.
• Reduced manual testing efforts, freeing up resources for exploratory testing and faster development.
• Strengthened Kart’s position as a reliable online retailer, building long-term customer trust.