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Case Study

Zero-Downtime Cloud Migration for Business-Critical Applications

Migrating mission-critical workloads to AWS with zero downtime using automation, blue/green deployment strategies, and resilient cloud architecture.

Enterprise SaaS
400+ Employees
AWS
10 Weeks
0
Minutes of Downtime
100%
Migration Success Rate
60%
Faster Deployments
45%
Infrastructure Cost Optimization
99.99%
Application Availability
8 TB
Production Data Migrated
Executive Summary

A growing enterprise needed to migrate business-critical applications from legacy infrastructure to AWS without disrupting customers or interrupting business operations.

NirvahaTech designed and executed a phased migration strategy using Infrastructure as Code, blue/green deployment, automated validation, and database replication to eliminate migration risk.

The migration successfully transitioned production workloads with zero downtime while improving scalability, operational resilience, and deployment agility.

Customer Profile
Industry
Enterprise SaaS
Employees
400+
Cloud Provider
AWS
Engineering Team
70 Engineers
Applications
Business-Critical Microservices
Deployment Model
Amazon EKS
Regions
Multi-AZ
Business Challenge

Where they were stuck

Business Challenges
  • Business required uninterrupted customer access throughout migration.
  • Legacy infrastructure limited scalability and resilience.
  • Migration risk was unacceptable for customer-facing workloads.
  • Rollback procedures were manual and untested.
  • Engineering teams required production confidence before cutover.
Technical Challenges
  • Legacy virtual machine workloads
  • Database synchronization
  • Application dependency mapping
  • Network cutover planning
  • DNS transition
  • Infrastructure consistency
  • Automated rollback strategy
  • Production validation
Objectives
Achieve zero-downtime migrationModernize infrastructureAutomate deployment workflowsReduce migration riskImprove application resilienceEnable rapid rollbackStandardize cloud architectureImprove operational visibility
Solution Overview

NirvahaTech implemented a migration framework combining Infrastructure as Code, blue/green deployment, automated testing, and cloud-native architecture to ensure a seamless transition.

Migration assessment
Terraform infrastructure
Amazon EKS platform
Blue/Green deployment
Database replication
Automated validation
Route53 traffic switching
Rollback automation
Production monitoring
Knowledge transfer
Solution Architecture

How it all fits together

Developers
GitHub
GitHub
GitHub Actions
GitHub Actions
Terraform
Terraform
Docker Build
Docker Build
Amazon ECR
Amazon ECR
Blue / Green Environments
Blue / Green Environments
Blue Environment
Blue Environment
Green Environment
Green Environment
Traffic Validation
Traffic Validation
AWS DMS
AWS DMS
Amazon Aurora
Amazon Aurora
Amazon S3
Amazon S3
Route53
Route53
CloudWatch
CloudWatch
Grafana
Grafana
Production Users
Implementation Timeline

10 Weeks, start to go-live

1
Week 1
Migration Assessment
2
Week 2
Target Architecture
3
Week 3
Infrastructure Provisioning
4
Week 4
Application Containerization
5
Week 5
Database Replication
6
Week 6
Blue Environment Testing
7
Week 7
Green Environment Validation
8
Week 8
Cutover Rehearsal
9
Week 9
Production Migration
10
Week 10
Hypercare & Optimization
Technology Stack

What was actually used

Cloud
AWS
AWS
Amazon EKS
Amazon EKS
Amazon ECR
Amazon ECR
Amazon Aurora
Amazon Aurora
Amazon S3
Amazon S3
Route53
Route53
CloudWatch
CloudWatch
Migration
Terraform
Terraform
AWS DMS
AWS DMS
GitHub Actions
GitHub Actions
Docker
Docker
Blue/Green Deployment
Blue/Green Deployment
Observability
CloudWatch
CloudWatch
Grafana
Grafana
Prometheus
Prometheus
Business Outcomes

Before vs. after

Downtime
Planned Maintenance0 Minutes
Deployment Speed
30 Minutes12 Minutes
Migration Success
Manual100% Automated
Application Availability
99.5%99.99%
Rollback Time
45 Minutes<5 Minutes
Infrastructure Cost
Baseline-45%
Engineering Highlights
Zero-Downtime MigrationBlue/Green DeploymentInfrastructure as CodeDatabase ReplicationAutomated ValidationDisaster RecoveryProduction ReadinessCloud-Native ArchitectureContinuous DeliveryOperational Excellence
Business Impact

The migration established a resilient cloud-native platform with zero customer disruption. Engineering teams gained a standardized deployment model, automated rollback capability, improved scalability, and a modern AWS foundation capable of supporting future business growth.

“NirvahaTech executed one of our most critical cloud migrations without a single minute of customer downtime. The planning, automation, and execution exceeded our expectations.”

— Chief Technology Officer

Ready to build a platform that enables engineers?

Whether you're modernizing Kubernetes, standardizing cloud infrastructure, or improving developer experience, NirvahaTech helps engineering teams build secure, scalable, and production-ready platforms.

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