GitOps Migration to AWS EKS with Argo CD

Challenges

The client operated a legacy on-premises Kubernetes environment with outdated CI/CD processes based on Jenkins. These processes lacked modern practices like GitOps, making it harder to maintain and scale infrastructure. As a result, they faced increasing challenges with:

Scalability and maintainability of infrastructure
Manual deployment processes and lack of visibility
Difficulty onboarding new teams into the development pipeline

Proposed solution & architecture

Unified Techs led a full-scale migration to AWS, delivering a GitOps-driven, cloud-native DevOps architecture built around AWS EKS, Terraform, GitHub Actions and Argo CD.

Infrastructure as Code with Terraform

Provisioned all AWS infrastructure using Terraform, including VPC networking, EKS clusters and managed node groups, IAM roles and policies, and logging and monitoring integrations
Developed modular, reusable Terraform code to ensure consistency across environments and support future scalability

CI/CD Modernization

Replaced the client's monolithic Jenkins pipelines with a modern, GitHub Actions-based CI process
Introduced matrix-based test automation, Dockerized build workflows with cache optimization, and integrated code quality checks and artifact publishing
Implemented a GitOps approach with Argo CD to drive automated Kubernetes deployments directly from source control

GitOps with Argo CD & Helm

Refactored applications into Helm charts
Used Argo CD to automatically sync changes from Git repositories to EKS, manage versioned deployments across dev, staging and production environments, and enforce RBAC policies with health checks and monitoring
Made release processes more predictable, auditable and aligned with industry best practices

Seamless Migration Strategy

Designed a phased migration approach, starting with low-risk services and progressing to mission-critical workloads
Achieved minimal downtime while following AWS security and reliability best practices