As a DevOps Engineer with experience in financial service infrastructure configuration and operation,

I possess skills in security enhancement, cost optimization, and CI/CD automation across the design, construction, and operation of infrastructure utilizing cloud services such as AWS.

Based on my experience of delivering tangible operational results using various technology stacks, I am a developer who contributes to building and operating stable and efficient systems, constantly researching and developing.

Experience

Nol-Universe

(August 2022 ~ Present)

FinOps Engineer

(June 2025 ~ Present)

<aside> 🗂️

Company-wide Cost Dashboard Construction Project

</aside>

Project Overview

• Need to identify cloud costs used in B2B services as well as B2C services

Problem-solving Methods

• Configured visualization dashboard with AWS Quicksight + AWS Athena + AWS Glue + AWS S3.
  • Set up a dashboard test environment on local using Docker Compose with Metabase(Dashboard) + Trino(Query Engine) + Hive-Metastore(Catalog) + MinIO(Object Storage).
• Integration and analysis of cost data based on FOCUS specifications
  • Utilizing SQL and Python Pandas

Achievements

• Improved cost visibility.

DevOps Engineer

(August 2022 ~ June 2025)

<aside> 🗂️

Electronic Financial Network Infrastructure Construction Project

</aside>

Project Overview

• Project to build a secure infrastructure completely separated from the existing general network due to the need for a closed network environment for electronic payment services requiring compliance with Financial Supervisory Service regulations

Problem-solving Methods Based on Requirements

• Implementation of AWS-based cloud environment and network isolation with dedicated VPC, Transit Gateway configuration and AWS VPC Network Firewall completely separated from general network
• Design and construction of 3-tier architecture based on AWS Network Firewall, CloudFront WAF, Private Subnet
• Establishment and application of security policies that meet ISMS requirements, such as security logging, access control, and encryption application

Achievements

• Successfully passed ISMS certification audit, met financial service launch schedule, fulfilled 100% of security requirements

<aside> 🗂️

AWS Cost Optimization Program Operation

</aside>

Project Overview

• Urgent need for cost efficiency improvement due to average monthly AWS infrastructure cost of $650,000
• Development and execution of strategies to reduce AWS infrastructure operating costs while maintaining service stability

Problem-solving Methods

• Establishment of Reserved Instance and Compute Savings Plan purchase strategy and monthly optimization execution
• Analysis of usage patterns and right sizing of major services such as EC2, RDS, OpenSearch, ElastiCache
• Introduction of Spot Instance to reduce development/test environment costs (EMR, EKS Node Group, etc.)
• Building monitoring dashboards based on AWS Trusted Advisor, Cost Explorer and conducting monthly cost reviews

Achievements

• Achieved annual cost savings of approximately $230,000 (35%), reducing average monthly AWS costs from $650,000 to $420,000

<aside> 🗂️

EKS-based Container Platform Construction

</aside>

Project Overview

• Increased operational complexity due to scalability limitations of existing ECS-based container environments and non-standardized deployment processes
• Improving development team productivity and operational efficiency by building a scalable and standardized container platform based on Kubernetes

Problem-solving Methods

• EKS cluster architecture design and Terraform-based IaC construction
• Cost optimization using dynamic node scaling with Karpenter and utilizing Spot Instances
• Construction of GitOps deployment pipeline based on ArgoCD and Helm
• Implementation of integrated Observability stack based on OpenTelemetry, Prometheus, Grafana, Loki

Achievements

• Reduced development team deployment time by 70% (from 30 minutes to 9 minutes)
• Reduced container infrastructure operating costs by 40%
• Improved productivity for 20+ developers across 5 teams

<aside> 🗂️

GitHub Enterprise Server High Availability Construction and Operation

</aside>

Project Overview

• Construction of high-availability GitHub Enterprise Server to provide a 24/7 stable source code management environment due to the risk of company-wide development work interruption in case of failure of GitHub Enterprise Server operating as a single instance

Problem-solving Methods

• Design and construction of high-availability architecture with Primary/Replica configuration
• Building and automating regular backup/recovery processes (periodic snapshots, backup verification)
  • Creating periodic snapshots using AWS Backup
  • Backup redundancy using GitHub Enterprise Backup Utility
• Establishment of failure response processes and construction of monitoring systems

Achievements

• Achieved service availability of over 99.9%
• Secured stability of source code management for company-wide development teams

<aside> 🗂️

CI/CD Pipeline Standardization and Automation

</aside>

Project Overview

• Increased management complexity and security risks due to different deployment processes and infrastructure configurations for each team
• Unification of deployment processes and enhanced security through construction of company-wide standard CI/CD pipeline

Problem-solving Methods

• Development and company-wide templating of GitHub Actions Reusable Workflows
• Construction of AWS EKS-based Self-hosted Runner environment (supporting Linux/Windows)
  • Linux Runners with GitHub ARC, Actions Runners Controller
  • Windows Runners with Custom Operators
• Development of Python-based Runner auto-scaling solution and utilization of Spot Instances
• Construction of Atlantis-based Terraform automation workflow

Achievements

• Completed CI/CD pipeline standardization
• Reduced Runner operating costs by 30% annually
• Improved stability with deployment failure rate below 5%