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#header Leejun Kim
mailto:lkim0402@cs.washington.edu
leejunkim.com
github.com/lkim0402
#section Education
#title B.S. Computer Science
#subtitle University of Washington - Seattle
#date Graduation date: June 2027
Relevant Coursework: Deep Learning, Data Structures & Parallelism, Hardware/Software Interface, Foundations of Computing 1 & 2, Software Design & Implementation
#section Experience
#title Machine Learning Intern
#subtitle ArtygenSpace
#date Aug 2024 - Dec 2024
Tech Stack: Python, HuggingFace, Git/GitHub
- Engineered a RAG pipeline using LangChain and GPT-4 to automate context-aware sound effect retrieval, replacing a manual process and significantly enhancing user experience with real-time audio responses.
- Systematically evaluated various LLMs and embedding models to optimize for retrieval accuracy, latency, and cost, presenting a final model recommendation to the team.
#title Research Assistant
#subtitle Makeability Lab @ UW
#date Sept 2024 - Present
Tech Stack: Unity/C#, GPT API, Python
- Developed SonoCraft, an AR HoloLens system that visualizes sounds through shape-based representations for DHH users, using real-time audio processing in Unity and the GPT API for real-time script generation and compilation.
- Designed a multi-agent AI pipeline, delegating specific tasks (e.g., audio transcription, shape generation) to specialized prompts with the GPT API, improving modularity and reducing token usage by 20% compared to a single prompt.
- link: https://makeabilitylab.cs.washington.edu/project/sonocraftar/
#title IT Assistant Technician (Part-time)
#subtitle Student Technology Assistance Team @ Pierce College
# date Oct 2022 - June 2023
- Provided hands-on technical support for software installation, network connectivity, and hardware malfunctions.
- Assisted on average 10-20 students per week, won "Employee of the Year" award
#section Skills
Languages: Python, Java, JavaScript/TypeScript, C#, SQL
Cloud & DevOps: AWS (EC2, ECS, ECR, RDS, S3, VPC, IAM), Docker, GitHub Actions, Vercel, Render
Frameworks & Libraries: Spring Boot, Node.js/Express, React, Next.js, LangChain, JUnit, Mockito
Databases: PostgreSQL, MongoDB
#section Projects
# title Real-Time Chatting Application
# date Jun 2025 – Sep 2025
Individual Project | Role: Backend Developer
Tech Stack: Spring Boot, Java, Docker/Docker Compose, AWS (EC2, ECS, ECR, RDS, S3, VPC), GitHub Actions, PostgreSQL
- Architected and deployed a highly available, containerized real-time chat application on AWS, utilizing ECS for service orchestration, RDS for managed PostgreSQL, and S3 for static asset storage.
- Automated the entire CI/CD pipeline using GitHub Actions, reducing deployment time from hours to minutes by automating testing, Docker image builds, and pushing to ECR.
- Engineered a robust backend using MVC architecture and Spring Data JPA, ensuring reliability with 85% unit and integration test coverage via JUnit and Mockito.
# title Findex
# date Jul 2025 – Aug 2025
Team Project | Contribution: 40% | Role: Backend Developer, Team Lead
Tech Stack: Spring Boot, Java, Spring Data JPA, PostgreSQL, Git/GitHub, Postman, Swagger
- Led a team of 5 developers, managing workflow with GitHub Projects and enforcing code quality through a strict Git branching and PR review process.
- Resolved a critical N+1 query bottleneck by optimizing JPA queries, decreasing API latency by ~90% (from 900ms to 80ms).
- Designed and implemented core financial analysis features, including a high-performance sliding-window algorithm for moving averages and a multi-window performance ranking system.
#title Custom CMS/blog
#description leejunkim.com
# date March 2024
Individual Project | Role: Full Stack Developer
Tech Stack: Node.js/Express, MongoDB, Next.js, React, TailwindCSS, Render, Vercel
- Built a personal blog/CMS for project documentation, essays, and blog posts
- Backend (RESTful API Server): Built Node.js/Express REST APIs for blog content management, and used MongoDB for schema flexibility and deployed backend via Render.
- Frontend (Blog & CMS): Developed blog in Next.js, deployed to Vercel, and built React-based CMS dashboard with TipTap editor, enabling CRUD post management.
#section Certifications
#title AWS Cloud Practitioner Certification