Jaegwang Yu

Backend engineer focused on reliable systems and pragmatic architecture.
Experienced in building event-driven backend services and contributing to large-scale open source.

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Summary

Backend engineer focused on building reliable and scalable systems through pragmatic architecture.

Contributor to the LINE Armeria open-source project and speaker at a paid developer conference on open-source contributions.

Technical Coach at SSAFY mentoring 200+ developers on backend architecture, CI/CD practices, and distributed system design.

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🏆 Open Source Contribution

[LINE Corp] Armeria

Contributor | PR #6604

• Implemented Custom Athenz Token Header Support
  • Added configurable Athenz authentication header support for Armeria clients.
  • Designed API changes while maintaining backward compatibility with existing clients.
  • Implemented tests and documentation to ensure production-level stability.
  • Collaborated with global maintainers through multiple review iterations in a large-scale open-source workflow.

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🎤 Conference Talk

Open Source Contribution to Armeria

Speaker — Paid Developer Conference

• Delivered a technical talk on the full lifecycle of contributing to the Armeria open-source project.
• Covered issue discovery, architecture analysis, design discussion with maintainers, and AI-assisted implementation.
• Shared practical insights on first-time open-source contributions and large-scale OSS collaboration.

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💼 Experience

SSAFY (Samsung Software Academy For Youth)

Technical Coach (실습 코치) | 2024.12 ~ Present

Mentored 40+ teams (200+ developers) on backend engineering and system architecture.

• Architecture & Code Quality
  • Provided technical consulting on MSA architecture, database schema design, and API specifications.
  • Guided teams in diagnosing and resolving concurrency issues in distributed systems.
• DevOps & Development Process
  • Introduced CI/CD best practices using Jenkins and GitHub Actions.
  • Helped teams adopt Agile workflows using Jira sprint management.

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🚀 Key Projects

E.D.I.T.H | AI Code Review & Documentation Assistant

👉 Github Repository

• Automated Code Review Pipeline: GitHub Webhook → Code Analysis → Review Comment

• Tech: Python LangChain RAG Vector DB GitHub API

• Built an automated code review pipeline triggered by GitHub Webhooks.

• Implemented a RAG-based review system using vector search to maintain project context.

• Generated commit-level summaries and automated improvement suggestions.

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Soup | AI-powered Trend Newsletter Platform

👉 Github Repository

• Distributed message processing using AWS SQS

• Tech: Spring Boot AWS SQS Docker Worker Pattern

• Designed a worker-based distributed architecture separating crawling, summarization, and email delivery.

• Introduced asynchronous message pipelines to handle large-scale email workloads.

• Reduced system coupling by separating background tasks through a message-driven architecture.

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🛠 Skills

Category	Skills
Backend	Spring Boot, FastAPI, JPA, QueryDSL, Java, Python
AI / Data	RAG, LangChain, Multi-Agent Systems, Vector DB (Milvus)
Cloud & Infra	AWS (EC2, S3, SQS), Docker, Docker Compose
DevOps	Jenkins, GitHub Actions, CI/CD Pipelines
Architecture	Kafka, Event-Driven Architecture, Microservices

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🎓 Education

SSAFY (Samsung Software Academy For Youth)

Java Track | 2024.01 ~ 2024.12

• Awards: Capstone Project 1st Place, Community Leadership Award
• Coursework: Advanced Algorithms, Backend Web Development

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B.S. in Computer Science

University in South Korea

• Coursework: Operating Systems, Computer Networks, Data Structures

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🏅 Certifications & Awards

• Profitlab Hackathon — 2nd Place
• Engineer Information Processing (정보처리기사)
• Samsung SW Competency Test — Level B
• FastCampus Builderthon — Finalist