Daehyun Kang

Education

Hankuk University of Foreign Studies B.S. in Computer Engineering, College of Engineering Mar 2023 - Present

Hanyang Science and Technology High School Diploma in Computer Networking Mar 2020 - Jan 2023

Experience

Vitasoft Sep 2021 - Mar 2023
AI Team / Software Engineer

Fellowships

Best of the Best Jul 2025 - Feb 2026
Next-Generation Security Leader Program / Security Product Development Track

Whitehat School Mar 2024 - Sep 2024
Next-Generation Security Leader Program

Software Maestro Apr 2023 - Dec 2023
Advanced Software Talent Development Program / Cohort Representative

Projects

BooOwlOwl - Find the Owl in the Owl Forest! Aug 2026 - Present
Team project / Live production service / Game

• Built a chat-based online Mafia game server with abilities for 14 roles, voting, and win-condition evaluation
• Separated public and per-user private events, with message validation and game-state updates in the React/TypeScript client
• Used Redis locks for room updates and database pessimistic locks and uniqueness constraints to handle concurrent requests and duplicate game actions
• Connected web and app login flows through Google OAuth, deep links, and secure token storage in the Capacitor Android app
• Achievement: Launched the web service and released the Android app on Google Play

HUFS CODE MASTER - Algorithm Learning Platform for HUFS Apr 2026 - Present
Team project / Live production service / Full-stack, AI

• Used DOMjudge judgehosts as the execution engine, implemented task-assignment and result-collection APIs, and delivered live judging progress through SSE
• Implemented user management with HUFS SSO, Redis-backed sessions, and student/instructor/administrator permissions
• Separated the Spring Boot backend from the FastAPI/Ollama inference server and processed AI code feedback asynchronously with Redis/RQ queues and callbacks
• Excluded private test-case contents from model input and added response-format validation, usage limits, and fallback responses
• Achievement: Operated the algorithm learning platform with the Department of Computer Engineering and the Office of Information Technology to support programming courses and HUFS CODE FESTIVAL

대현.com - Utility Service for Mafia42 Players Sep 2020 - Present
Personal project / Live production service / Full-stack, Android, AI

• Changed ranking queries to read precomputed results instead of recalculating the full dataset on each request
• Built an AI feature that analyzes game replays and posts gameplay feedback as comments
• Developed the Daehyun.com Android app and released it on Google Play
• Configured blue-green deployment to switch Nginx traffic after checking the new container's health
• Operated an advertising-supported service with Google AdSense and in-house ad management, improving features based on user feedback
• Achievement: Reached 3,100+ registered users and 4,400+ MAU, and achieved profitability

Control Tower - Integrated Cloud Monitoring Based on Log Intelligence ^GitHub Sep 2025 - Dec 2025
Best of the Best 14th team project / Open source

• Linked AWS asset snapshots with CloudTrail events to track asset changes and identify the actors involved
• Evaluated S3/RDS configuration changes against YAML policies to classify their risk
• Scored user-activity features with Mahalanobis distance and displayed the main features contributing to each score
• Achievement: Published a paper at the CISC-W'25 Conference of the Korea Institute of Information Security & Cryptology

Grape Office - Username OSINT Tool for Korean Platforms ^GitHub May 2024 - Jul 2025
Whitehat School 2nd cohort team project / Open source

• Developed an OSINT tool to check whether public accounts with a given username exist on Korean community platforms
• Managed site-specific URLs and account-not-found rules in JSON, filtering results by HTTP status codes and response text
• Released the source code under the MIT license and provided a Docker runtime

Collectime - Group Scheduling Service ^GitHub May 2023 - Nov 2023
Software Maestro 14th cohort team project / Live production service / Backend

• Implemented group and schedule management APIs with Kotlin/Spring
• Retrieved events through the Google Calendar API and synchronized them with service schedules through a periodic job
• Automated Gradle builds, Docker image creation, and registry pushes with GitHub Actions

Publications

A Behavior-Based Anomaly Detection Framework Using Cloud Service Logs
Korea Institute of Information Security & Cryptology CISC-W'25 Conference / First Author

Vulnerability reporting

CVE-2026-59411 Oct 2026
Spring Boot / CVSS 9.1 ^GitHub

CVE-2026-59398 Sep 2026
Spring WebFlux / CVSS 5.3 ^GitHub

CVE-2026-59392 Sep 2026
Spring Framework / CVSS 5.7 ^GitHub

CVE-2026-59336 Aug 2026
Spring AI / CVSS 3.5 ^GitHub

CVE-2026-47883 Aug 2026
Spring Framework - Open Redirect in UrlHandlerFilter / CVSS 5.4 ^GitHub

CVE-2026-41729 Jun 2026
Spring Data REST - SpEL Injection via Map Key in JSON Patch / CVSS 8.1 ^GitHub

CVE-2026-40987 Jun 2026
Spring Integration - Remote-file Synchronizer Arbitrary File Write / CVSS 7.1 ^GitHub

Certifications

Google AI Professional Certificate Aug 12, 2026
Google
YK7F8V3NM69Q

TOEIC Speaking IM3 Jun 5, 2026
TOEIC

2025 Daangn Builder's Camp Sep 21, 2025
Karrot

Oracle Cloud Infrastructure Foundations Associate Jul 11, 2025
Oracle
296732356OCI25FNDCFA

TOPCIT Level 3 Oct 2023
Institute of Information & Communications Technology Planning & Evaluation

Industrial Engineer Information Processing Sep 21, 2022
Human Resources Development Service of Korea
22251020182F

Awards

Grand Prize, 13th Bring Your Own Idea Competition (HUFS President's Award) Jul 14, 2026
Hankuk University of Foreign Studies

Outstanding Project Award, Spring 2026 Capstone Design Jun 17, 2026
Department of Computer Engineering, Hankuk University of Foreign Studies

Outstanding Project Award, 1st G-RISE Capstone Design Competition Jun 4, 2026
HUFS G-RISE Project Group

Grand Prize, 3rd HUFSummer Hackathon (HUFS President's Award) Jul 12, 2024
Hankuk University of Foreign Studies

Excellence Award, 2nd HUFSummer Hackathon (Dean of Engineering Award) Jun 30, 2023
Hankuk University of Foreign Studies

Community & Leadership

Google Developer Groups on Campus HUFS 2023 - 2026

• 8th Cohort Senior Core Member
• 7th Cohort Organizer
  • Led developer community operations and event planning
• Core Member, 6th and 5th Cohorts
  • Supported developer community operations

HUFS CODE FESTIVAL Organizing Committee 2023 - 2025
HUFS AI Education Center & Google Developer Groups on Campus HUFS

• Competition Director, 7th HUFS CODE FESTIVAL (Nov 2025)
  • Built a self-hosted, on-premise competition platform
  • Led end-to-end competition planning and operations
  • Managed the problem-setting and review process
• Problem Setter, 6th and 5th HUFS CODE FESTIVAL (Oct 2024 / Nov 2023)
  • Authored and reviewed competition problems

Hanyang Science and Technology High School Assistant Instructor, Department of Computer Networking Jul 2023

• Mentored student teams in refining project ideas and defining development direction for an industry-academia apprenticeship program
• Helped resolve technical issues in web and game programming implementations

HUFS Software Volunteer Corps Feb 2024 - Jan 2025