A global collaboration platform required zero-downtime deployment on AWS. By using an ALB, VPC, S3 with CloudFront, and a Jenkins CI/CD pipeline supporting rolling, blue/green, and canary releases, we enabled automated, reliable deployments with instant rollbacks and optimized network performance.

Why AWS

AWS was selected for its high availability, low-latency networking, and strong scalability. Its CI/CD ecosystem and fast rollback features enabled zero-downtime releases while maintaining reliability and resilience.

The Challenge

A B2B messaging platform serving enterprise teams needed zero-downtime, high-speed deployments, but its AWS setup was manual, making rollbacks slow and increasing operational risk. An automated deployment process was essential to maintain availability and performance.

Architectural Decisions

Zero-Downtime Strategy

• Blue/Green deployment   for major version releases:

• • Jenkins automatically manages rollback by tracking the previous environment and switching target groups in ALB within less than 12 sec if health checks fail.

Blue/Green switch with rollback Collapse Expand
stage('Blue/Green Switch') {
    steps {
        script {
            sh """
              aws elbv2 modify-listener \
                --listener-arn ${LISTENER_ARN} \
                --default-actions Type=forward,TargetGroupArn=${NEW_TG_ARN}
            """

            sleep 30

            def unhealthy = sh(
                script: """
                    aws elbv2 describe-target-health \
                      --target-group-arn ${NEW_TG_ARN} \
                      --query 'TargetHealthDescriptions[?TargetHealth.State!=\`healthy\`]' \
                      --output text
                """,
                returnStdout: true
            ).trim()

            if (unhealthy) {
                echo "Health check failed — rolling back"
                sh """
                    aws elbv2 modify-listener \
                      --listener-arn ${LISTENER_ARN} \
                      --default-actions Type=forward,TargetGroupArn=${OLD_TG_ARN}
                """
                error("Deployment rolled back")
            }
        }
    }
}
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• Canary deployment   for patch versions:

• • Traffic is gradually shifted using weighted target groups in ALB.
  • Jenkins dynamically adjusts canary percentages based on real-time metrics (latency, error rate) to ensure safe rollout.



• Rolling deployments   for config-only changes:

• • Instances are updated in batches to maintain service availability.
  • ALB health checks ensure only healthy instances receive traffic.
  • Jenkins orchestrates batch size and pauses rollout automatically if error thresholds are exceeded.
  • Previous instance group is preserved temporarily to allow fast rollback if needed.

Performance & Stability Measurements

Load Test

•   450 concurrent clients
•   25,000 messages over 20 minutes
•   File uploads: 8.5GB mixed content

Results & Benefits

The deployment framework delivered zero-downtime releases with blue/green and canary strategies, instant rollback under 12 seconds, and fast asset delivery via S3 + CloudFront. Internal users now experience sub-150 ms response times, while a fully isolated VPC and auditable CI/CD history ensure security and reliability. Over the past 30 days, uptime reached 99.996%, demonstrating the effectiveness of the automated, repeatable infrastructure.