About

Younsung Lee

DevOps Engineer. Github email.

Work Experience

DevOps Engineer | Coinone
May 30, 2023 ― Present

AWS, GCP, Kubernetes, Observability, CI/CD, Terraform, Infrastructure Ops

• Manage and operate 6 EKS clusters in a multi-stage environment: experienced EKS versions v1.24 to v1.27.
• Operate Kubernetes policy engine ^Kyverno and Node Termination Handler.
• Automate repetitive operational tasks.
• Operate CI/CD pipeline based on Github Actions Workflow and ArgoCD.
• Build and operate Github Enterprise Server, Github Enterprise backup utilities and Actions Runner Controller.
• Build and operate MSK Cluster and OpenSearch Cluster.
• Migrate github enterprise backup server ^backup-utils workload from EC2 to EKS CronJob for leveraging dedicated EKS cluster.
• Develop and release backup-utils-chart project as a maintainer.
• Provision and operate multi-account AWS infrastructure using terraform modules.
• Integrate private networking between GCP and AWS to connect GCP Service APIs from EKS Pods.

DevOps Engineer | Greenlabs Financial
Sep 5, 2022 ― Apr 7, 2023 (7 mos)

AWS, Kubernetes, Istio, Observability, CI/CD, Terraform, MLOps, Infrastructure Ops

• Acquired electronic finance business license ^#2022-483 after building multi-account AWS infrastructure for 3 months from September to December 2022.
• Managed and operated 2 EKS clusters in a multi-stage environment: experienced EKS versions v1.24 to v1.25. ^†
• Provisioned and operated multi-stage AWS infrastructure using terraform.
• FinOps: Optimized multi-account infrastructure and reduced monthly AWS cost from $6800 to $4800, 30% monthly cost savings from Jan 2023 to Mar 2023.

Cloud Engineer | Watcha
Feb 14, 2022 ― Aug 5, 2022 (6 mos)

AWS, Kubernetes, CI/CD, Terraform, Infrastructure Ops

System Engineer | KDN
Dec 16, 2013 ― Feb 11, 2022 (8 yrs 2 mos)

On-premise, Linux administration, VMware Cluster administration, Storage administration, Backup and Recovery, Monitoring, Infrastructure Ops

• Orchestrated the uninterrupted operation of VMware cluster environments, guaranteeing stability and high availability.
• Automated routine operational tasks using python and bash script.
• Collaborated closely with the development team to understand their virtual machine provisioning needs.
• Provided technical support for virtualization-related incidents and challenges, consistently ensuring prompt issue resolution.
• Collaborated with vendors to address hardware and software issues, resulting in minimal disruptions to operations.
• Installed and configured backup agents for VMs, executing OS and database-level backup and recovery procedures using EMC Networker.
• Out of job due to military service, ROKAF from Nov 2014 to Nov 2016.

Education

BSE, ICT Applied | Chosun University
Mar 2018 ― Feb 2022

Certification

Community contributions

#2896 ^{grafana/helm-charts}
#245 ^{aws/aws-network-policy-agent}
#4732 ^{kedacore/keda}
#567 ^{fjogeleit/yaml-update-action}