# How a major retailer tested critical serverless systems with Failure Flags

DevFeed: [How a major retailer tested critical serverless systems with Failure Flags](<https://devfeed.tech/articles/how-a-major-retailer-tested-critical-serverless-systems-with-failure-flags-11586.md>)

Original publisher: [Read original article](<https://www.gremlin.com/blog/how-a-major-retailer-tested-critical-serverless-systems-with-failure-flags>)

Author: Gavin Cahill

Published: 2025-03-12T00:00:00Z

Content type: article

Language: en

Sources: [Gremlin Blog](<https://devfeed.tech/sources/gremlin-blog.md>)

Topics: [Failure Flags](<https://devfeed.tech/topics/failure-flags.md>), [AWS Lambda](<https://devfeed.tech/topics/aws-lambda.md>), [Serverless](<https://devfeed.tech/topics/serverless.md>), [systems](<https://devfeed.tech/topics/systems.md>), [Amazon EC2](<https://devfeed.tech/topics/amazon-ec2.md>), [Amazon Web Services](<https://devfeed.tech/topics/aws.md>)

Tags: [amazon-ec2](<https://devfeed.tech/tags/amazon-ec2.md>), [aws-lambda](<https://devfeed.tech/tags/aws-lambda.md>), [failover](<https://devfeed.tech/tags/failover.md>), [failure-flags](<https://devfeed.tech/tags/failure-flags.md>), [gremlin](<https://devfeed.tech/tags/gremlin.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [outage](<https://devfeed.tech/tags/outage.md>), [serverless](<https://devfeed.tech/tags/serverless.md>), [testing](<https://devfeed.tech/tags/testing.md>)

## AI overview

A case study describes how a major apparel retailer used Gremlin Failure Flags to test regional failover for a critical payment service built on AWS Lambda. Because Lambda abstracts the underlying infrastructure, conventional infrastructure-level fault injection could not reproduce a regional failure. Failure Flags enabled the retailer to run the failover test in less than 30 minutes.

## Source excerpt

Find out how Gremlin helped a major retailer test region failover for a critical service built on AWS Lambda using Failure Flags.