Versatile and results-driven full-stack engineer and tech lead with over 10 years of experience building scalable, production-grade systems. Proven ability to ship quickly in fast-moving environments, with deep expertise in backend (Java, Go, Kotlin) and frontend (React, TypeScript) development.

• 🌱 Strong track record in leading teams, designing distributed architectures, and optimizing CI/CD pipelines
• 🎯 Led engineering initiatives that improved user connection rates by 20% and reduced API costs by 20%
• 🌍 International experience across South Korea, Germany, Singapore, and Japan
• ☁️ Expert in cloud migration from on-premises to AWS and Kubernetes infrastructure

• 🎯 Performance Optimization: Cut external data-provider API costs by 20% via multi-layer caching
• 📈 Architecture Leadership: Led MyData 2.0 redesign, raising connection success by 20%
• 🔄 System Resilience: Led transition from synchronous to asynchronous data sync for improved resilience
• ☁️ Cloud Migration: Led migration initiatives from on-premises to AWS and Kubernetes
• 👥 Team Leadership: Led 3-person engineering team, introducing Agile and mob programming practices
• ⚡ Scale: Built large-scale Go microservices on MySQL databases exceeding 4TB
• 🏗️ Systems Design: Built data sync systems with Go, gRPC, MySQL, AWS SQS/SNS, Kafka, and Redis

• 🧪 Test Automation: Developed automated test failure analysis systems for improved debugging
• 📊 Testing Velocity: Established pipelines for test automation and result analysis
• 🔧 Framework Enhancement: Enhanced internal E2E testing framework with Jest, TypeScript, React, Hack, and Python

• 💰 Financial Platform: Developed financial platform using Spring (Java), Go, React (TypeScript), PostgreSQL, and BigQuery
• 🏗️ Microservices: Designed and implemented distributed systems with microservice architecture
• 📊 Data Systems: Developed high-throughput data distribution system using Kafka and Go

• ✈️ Travel Platform: Developed travel itinerary system for Japan's second-largest travel booking platform
• 🔧 CI/CD: Established deployment pipelines using Jenkins, Ansible, and shell scripts
• 🧪 QA Enhancement: Created test data comparison application using React

Active contributor to the official Keycloak Terraform Provider with 4 merged PRs:

• #1381 - Added authentication subflow data source
• #1323 - Added support for sub mapper configuration
• #1382 - Fixed PKCE code challenge method state persistence
• #1391 - Added missing authorization resource documentation

Contributions span documentation improvements, bug fixes, and feature additions, improving the infrastructure-as-code experience for Keycloak users worldwide.

• 📊 20% Cost Reduction in external data-provider API calls through multi-layer caching optimization
• 📈 20% Improvement in connection success rates through MyData 2.0 architecture redesign
• ⚡ 40% CI/CD Optimization of GitLab pipeline through architectural improvements
• 🏗️ Migration Leadership from on-premises to AWS Cloud and Kubernetes infrastructure
• 🔧 Full-Stack Expertise across backend (Java, Go, Kotlin), frontend (React, TypeScript), and cloud infrastructure
• 🌐 Global Impact with experience across 4 countries (South Korea, Germany, Singapore, Japan) and multiple industries (fintech, travel, social media)
• 💾 Large-Scale Systems handling 4TB+ MySQL databases in microservices architecture
• 🔐 Enterprise Authentication designed company-wide SSO solutions with advanced access control

I'm always interested in discussing technology, architecture, and engineering leadership. Feel free to reach out!

• 📧 Email: [email protected]
• 💼 LinkedIn: linkedin.com/in/eunseokkang
• 📍 Location: Daejeon, South Korea