Koutroumpis Ioannis

Cloud Infrastructure Engineer

• ☁️ Leading cloud infrastructure initiatives in Azure with a focus on AKS, GitOps (Flux), and CI/CD automation.
• 🧑‍💻 Act as senior engineer on the team; reviewing IaC, mentoring engineers, and shaping architecture standards.
• ⚡ Reduced AKS cluster bootstrapping time by 90% through migrating provisioning workflows from Ansible to GitHub Actions.
• 🐳 Designed and implemented a custom Docker image to standardize development environments and CI/CD workflows via GitHub Actions.
• 🌐 Participating in the network architecture redesign for Private AKS clusters, leveraging Private Endpoints, and cross-region connectivity.
• 📦 Migrated all Cloud Platform repositories from Git tags to GitHub Releases, improving release traceability, documentation clarity, and artifact distribution.

DevOps Engineer

• 🐙 Gained deep Kubernetes expertise by leading the gradual migration of a monolithic .NET Core application to microservices, while actively spreading Kubernetes knowledge across teams and enabling company-wide adoption.
• 🚀 Deployed and managed Kubernetes clusters across environments: on-prem (kubeadm on Hyper-V Ubuntu VMs for dev), AKS HCI hybrid clusters (QA/staging), and AKS in production.
• 🔐 Designed and implemented a secure private Docker Registry, centralizing image management and enabling controlled distribution across Kubernetes clusters.
• 🛡️ Enforced container security best practices, including Docker image hardening (non-root users, minimal base images, reduced attack surface) and mutual TLS (mTLS) with Linkerd service mesh for secure inter-service communication.
• ⚙️ Developed CI/CD pipelines with Azure DevOps and automated tasks using PowerShell, Bash, and Python scripting.
• 🖥️ Managed extensive Linux system administration and configuration alongside Windows server environments (including IIS).

System Administrator

• 👨‍💼 Lead System Administrator, gaining hands-on experience with Azure, firewalls, on-premise infrastructure, Active Directory, Linux & Windows servers, Office365, and VMware virtualization.
• ⚙️ Gradually incorporated DevOps principles by automating infrastructure management and implementing monitoring and logging solutions like Graylog and InfluxDB/Grafana, while expanding expertise in Azure Cloud.

It Specialist

• 🌐 Managed computer networking tasks including routers, switches, and related hardware.
• 🛠️ Provided remote and on-site support for hardware, software, Linux & Windowss mail/DHCP servers, and networking issues.

Junior System Administrator

• 🖥️ Managed MS Windows Server 2008 and Active Directory environments.
• 🔧 Provided IT support for hardware, software, network devices, and cabling.
• 💻 Supported Windows OS, Office 365, and Microsoft Exchange services.

Technological Education Institute of Piraeus