Hi there, I'm Jaeho 👋
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.
⚡ Highlights
- 🏗️ 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)
🚀 Key Engineering Achievements
1. AWS EKS Infrastructure & GitOps (DevOps)
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
2. Serverless Infrastructure & AI Platform (DevOps + LLM)
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
3. IaC Automation & Serverless API (Terraform + Rust)
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
4. DevOps Tooling & Secure Server Infrastructure
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
5. Data Pipeline & Streaming (Early Career)
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
🛠 Tech Stack
Cloud & DevOps
Backend & Systems
Frontend & Mobile
Data & Observability
🏆 Open Source Contributions
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)
Grafana metrics-drilldown — Migrated DashboardPanelMenu extension from deprecated category to the new group API, enabling removal of the backward-compat shim in Grafana core. (PR #1121)
🛠 Tools & Extensions
[VS Code] MyBatis Formatter — Auto-formats complex MyBatis XML mappers. Built and published to improve team coding conventions.
👥 Community & Mentoring
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.
🏆 Certifications
- 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)
