2022-08-31

About

Younsung Lee

DevOps Engineer. Github.

DevOps Engineer @ Coinone
May 30, 2023 ― Present (1 yr 8 mo)

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.
Migrate EKS node groups provisioned with terraform from AL2 to AL2023.
Operate Kubernetes policy engine Kyverno and Node Termination Handler. * **
Improve scalability by applying pod autoscaling based on Throughput Per Seconds metric using KEDA in the production environment. *
Automate repetitive operational tasks.
Operate CI/CD pipeline based on Github Actions Workflow and ArgoCD.
Build and operate RabbitMQ, MSK Cluster and OpenSearch Cluster. * **
Build and operate Github Enterprise Server, Github Enterprise backup utilities and Actions Runner Controller. * **
Containerize github enterprise backup server and migrate workload from EC2 to kubernetes cronJob for leveraging dedicated EKS cluster.
Develop and release backup-utils helm chart 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.
Implemented and managed Velero server in a production EKS cluster, orchestrating scheduled backups and executing recovery tests. *
Automate daily resource creation using GitHub Actions for terraform apply, and enhance Terraform workflows with Atlantis for collaboration. *
Deployed and managed Linkerd, a service mesh, to enhance cluster security with mTLS and improve observability between microservices.

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.
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.

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