Cloud DevOps Engineer
Siemens Energy, Dublin, Ireland · Dublin
Architected and implemented AWS EC2 Auto Scaling for GitLab infrastructure, reduced scaling response time by 50-60% and improved cost efficiency by approximately 40%, while maintaining 99.9% availability during peak workloads. Implemented Docker-in-Docker containerisation to enable containerised CI/CD pipelines and automated build environments. Used Terraform for infrastructure-as-code provisioning, Packer to build and harden AWS AMIs. Designed and automated end-to-end cloud infrastructure provisioning and configuration management using Terraform, Ansible and GitLab CI/CD pipeline enabling one-click infra deployments and eliminating manual steps in the provisioning workflow. Collaborated with the platform team to deploy and operate a GitLab MCP server on Kubernetes (ROSA OpenShift) via GitOps workflow, maintaining declarative manifests in Git with Argo CD continuously reconciling DEV and PROD overlays. Designed and deployed Core AWS infrastructure (VPC, Subnets, SG, IGW, RT, TGW) using Terraform supporting secure network architecture design. Diagnosed and resolved network connectivity issues using TCP/IP-layer troubleshooting (nslookup, telnet, netstat).