Senior DevOps / SRE / Cloud Infrastructure Engineer

Designing and Operating Cloud-Native Infrastructure with Kubernetes, Terraform & AWS

6+ years of experience building production cloud infrastructure across 9+ companies. Core strengths in Infrastructure as Code (Terraform), Kubernetes (EKS) operations, CI/CD automation, and serverless architecture.

• 🏗️ ECS → EKS Migration — Full Terraform IaC migration with ArgoCD GitOps & Service Mesh (FitPet)
• ☁️ AWS Serverless Platform — Built power forecasting SaaS & RAG-based LLM chatbot on Lambda + CDK (GS Energy)
• 🔭 Observability — Reduced Datadog costs via span/log optimization; built LangChain Tracing LLM pipeline
• 🔐 Security Architecture — Envelope Encryption + TOTP secure comm, EKS RBAC & IAM automation
• ☁️ AWS Certified Solutions Architect – Associate (2026–2029)

FitPet — Infrastructure Team (2022.11 ~ 2023.02)

• Migrated all services from ECS → EKS using Terraform IaC, introduced Service Mesh for MSA stability
• Designed IAM-integrated RBAC access control and configured ArgoCD-based GitOps deployment
• Built serverless EKS resource scheduling admin system with AWS Lambda + Amplify + Cognito
• Reduced Datadog monitoring costs by restructuring Ingested Span / Indexed Log strategies
• Established Kubernetes autoscaling for improved availability and reliability

GS Energy — AWS Infra & Full-Stack (2024.11 ~ 2025.11)

• Automated full AI infrastructure with AWS CDK (IaC): Lambda, OpenSearch, Secrets Manager, SSM
• Implemented multi-stage CI/CD pipeline (dev→sandbox→prod) with GitHub Actions + branch strategy
• Designed Naive RAG + Agentic RAG dual-architecture LLM chatbot (AWS Bedrock + OpenSearch vector store)
• Built LangChain Tracing-based LLM observability pipeline; integrated chatbot into Microsoft Teams
• Configured large-scale data pipeline using S3 + Athena; designed DynamoDB schema by Access Pattern

Hut-Dul-Hut-Dul — Infra & Backend (2024.04 ~ 2024.07)

• Automated full AWS infrastructure (Lambda, S3, API Gateway, Athena) with Terraform IaC
• Developed high-performance RESTful APIs using Rust + Tokio on AWS Lambda (Cargo Lambda)
• Built serverless crawlers with Node.js + Puppeteer → S3 ingestion pipeline

CODEMIND Corp. — Senior Research Engineer (2023.06 ~ 2024.04)

• Deployed scalable license/update servers with Docker Swarm on Azure
• Implemented Envelope Encryption + TOTP-based secure client-server communication architecture
• Migrated Linux packaging from deb → Snap (security sandboxing + auto-update)
• Built full E2E test suite with Playwright and automated deployment pipeline with TypeScript scripts

Lucent Block — Data & Infra Team (2019.12 ~ 2020.07)

• Implemented event-driven message queue using Apache Kafka on Kubernetes
• Built cloud infrastructure with EKS + Terraform, performed Kafka benchmarking & optimization

Cloud & DevOps

Backend & Systems

Frontend & Mobile

Data & Observability

Recharts (24k+ Stars) — Refactored Label.tsx to eliminate implicit-any types, improving type safety and build stability. (PR #5600)

RobustMQ (Rust) — Implemented mqtt schema CLI command (PR #911) and refactored Broker Server logging for improved observability. (PR #906)

OpenZeppelin — Contributed to official documentation for Rust-based smart contracts. (PR #529)

[VS Code] MyBatis Formatter — Auto-formats complex MyBatis XML mappers. Built and published to improve team coding conventions.

Algorithm of the Legends (Founder & Lead) Weekly code reviews and optimization strategy sessions (Baekjoon, LeetCode).

Codeit Mentor (2025.07 ~ Present) Full-Stack Bootcamp Mentor — Code reviews and 1:1 mentoring for students on React, Node.js & AWS.

Junior Developer Mentoring (2025.04 ~ 2025.06) Guided hands-on enterprise web app development with Java 21, Spring Boot 3.4, AWS CDK (IaC) & ECS.

• AWS Certified Solutions Architect – Associate (Jan 2026 – Jan 2029) — Verify via Credly
• CKA: Certified Kubernetes Administrator (Feb 2026 – Feb 2028) — Verify via Credly
• Engineer Information Processing (Nov 2018)