Nahyun Kim

Backend / Server Engineer

Language: Java, JavaScript, Python
Framework / Library: Spring Boot, JPA, Spring Security, React
Database: MySQL, Redis
Infrastructure / Deployment: Docker, AWS EC2, RDS, S3, Cloudfront, Jenkins, Nginx
Version Control: Git, GitHub
ETC: REST API, OAuth2, JWT, WebSocket, Swagger
Basic frontend: React, Next.js, Tailwind CSS

github/even-zaro-back ↗

Project Lead, Backend, Server, Frontend Backup | 2025.05 ~ 06

Participated as PM and backend engineer, leading the entire process from planning, design, requirements gathering, ERD modeling, API design, infrastructure setup, to deployment
Built JWT-based authentication and Spring Security-based authorization flow, along with email verification and dormancy automation, to enhance the consistency of the authentication and authorization system
Maintained consistent global exception handling using GlobalExceptionHandler, and implemented standardized error responses via ErrorCode enum and separated validation responsibilities using custom validators
Reviewed query flows in the database and contributed to API response performance improvement by eliminating duplicate calls and optimizing logic
Configured and operated cloud infrastructure and server management using AWS EC2, RDS, S3, and CloudFront
Constructed a CI/CD pipeline using Jenkins, Docker, and Nginx, and automated Blue-Green deployment. During deployment, separated server roles between build and run servers to achieve approximately 76% cost reduction ($74 → $18) by avoiding dual high-spec instances
Implemented post search functionality with Elasticsearch and built an S3 Presigned URL-based image upload API

github/even-IDE-back ↗

Project Lead, Backend, Server, Frontend Backup | 2025.04

Participated as PM and backend engineer, leading the entire process from planning, design, requirement analysis to ERD design, API design, infrastructure setup, and deployment
Implemented CRUD APIs for project and file management, and developed OAuth2-based social login and user information handling logic
Replaced Docker-in-Docker with a separated execution server to address security and performance issues, structured via a separate port on the same EC2 instance for simplified operations, and designed a stable execution flow using an API proxy
Developed real-time chat and collaborative code editing using WebSocket (STOMP) to support team collaboration
Designed message retrieval policies based on login status and improved structure by utilizing Redis ZSet for time-based filtering
Implemented AI chatbot integration using Spring AI and OpenAI API, including prompt design
Refactored ChatClient code to adapt to updated dependencies and structure after the release of Spring AI 1.0
Managed AWS EC2 servers and set up CI/CD pipeline using Jenkins for deployment

3 Years

UX Consultant, Project Manager (Full-time) · UX Consulting Team | 2023.06 ~ 2024.07 (1yr 1month)

Designed a data-driven UX consulting process and led planning for implementing analytical models
Proposed and led a government-supported data voucher project, planning a system for unstructured customer data analysis and conducting a PoC using Python-based data preprocessing and research automation in a non-developer team
Led information architecture and feature definition through close collaboration with designers during new service planning

Junior Manager (Full-time) · Marketing Team (Business Support Part) | 2019.03 ~ 2021.02 (2yr)

Participated in data flow management for sales, payments, and settlements, and in planning system functionalities
Proposed collaboration tool adoption and led improvements in approval workflows
Managed new and existing residential project operations

github/code-is-evenly-cooked ↗

Goorm Fullstack Bootcamp
2024.11 – 2025.06
- Completed 6 projects (React/Spring), served as team lead, PM, backend lead
- Finalist in top project teams, selected as outstanding graduate

Hongik University – M.S., Smart Design Engineering (GPA 4.5)
2021.03 ~ 2023.02
- Aalto University, Finland – M.S. Exchange Student
  2022.01 ~ 2022.06
Hongik University – B.S., Civil Engineering (GPA 4.01) / Mechanical Engineering (Double Major, GPA 4.38)
2012.03 ~ 2018.08

Korean: Native
English: Fluent (Experience as an exchange student in Finland and language trainee in Ireland)
Chinese: Conversational (Studied in Nanjing, China during elementary and middle school)