CV

Basics

Name Jihyeon Jeong
Label Aspiring Backend & Infrastructure Engineer · Undergraduate Researcher
Email fosyl@ajou.ac.kr
Url https://jihyeonjeong129.github.io
Summary Aspiring backend and infrastructure engineer who designs and operates systems that stay reliable, observable, and recoverable under real-world failures. Hands-on through a self-hosted 3-node home lab (Linux, Docker) run as a production-like environment. Also interested in open-source contribution and Approximate Nearest Neighbor Search (ANNS).

Open Source

  • 2026.07 - Present

    Remote, South Korea

    Open Source Contributor — LLVM (OSSCA 2026 Mentee)
    Open Source Contribution Academy (OSSCA) — MSIT / NIPA, South Korea
    Selected for the LLVM track of OSSCA 2026, contributing to LLVM — a large-scale, industry-wide open-source project — under maintainer mentorship. Focused on the real-world open-source contribution workflow and community collaboration, working toward first upstream contributions.
    • Engaging with a large-scale, widely-used open-source C++ codebase — building from source and navigating an industrial-scale project structure.
    • Learning the upstream contribution workflow end to end: issue tracking, patch preparation, and community code review under maintainer guidance.
    • Building fluency with the collaboration practices behind major open-source projects (Git-based workflow, CI, and review etiquette).

Projects

  • 2017 - PRESENT
    My Awesome HomeLab
    Designed and managed a personal home server infrastructure built on hypervisors (ESXi, XEN) to support private cloud services, AI research, and self-hosted applications. The HomeLab also serves as a deployment environment for various personal projects.
    • Configured and maintained OpenMediaVault-based NAS with real-time PC synchronization
    • Deployed Mattermost for internal messaging with domain routing, SSL, and Cloudflare Tunnel integration
    • Implemented JupyterHub-based AI training server leveraging GPU passthrough
    • Operated PhotoPrism for automated photo management and archiving
    • Utilized the HomeLab to deploy and showcase results from various projects
  • 2025.05 - 2025.06
    TACTIX: RAG-based Aircraft Maintenance Support System
    Built an AI-assisted system that enhances aircraft maintenance efficiency by integrating RAG with expert-rule reasoning, enabling technicians to quickly access and apply maintenance knowledge.

    FastAPI Qdrant Ollama

    • Implemented RAG pipeline with vector DB for fast and accurate manual/document retrieval
    • Integrated LLM with rule-based expert system to guide troubleshooting and procedures
    • Designed secure, on-premise full-stack deployment (Frontend, Backend, GPU acceleration) for closed military networks
  • 2025.04 - 2025.05
    Moisam: Dormitory Group-Purchase Platform
    Developed a closed web platform for Ajou University dorm residents to coordinate group purchases, focusing on database design and implementation.

    MySQL Flask

    • Designed relational schema and normalized tables (1NF→BCNF) for core entities such as Users, Posts, Participation, and Chat
    • Implemented database-backed features including recruitment posts, participation tracking, comments, and real-time chat

Work

  • 2023.03 - 2024.12

    Osan, South Korea

    Military Service, Systems Technician
    Republic of Korea Air Force – 1MCRC (Master Control and Reporting Center)
    • Provided maintenance and operation support for critical air defense communication and backup systems.
    • Managed equipment essential to Anti-jamming Radio and command center operations.
    • Performed system maintenance and troubleshooting on Linux/UNIX platforms.

Education

  • 2021.03 - Present

    Suwon, South Korea

    Undergraduate Student
    Ajou University
    Software (major), Electronic Engineering (double major)
  • 2018.03 - 2021.02

    Busan, South Korea

    Busan il Science High School

Courses

Awards

  • 2026.01.09
    Special Award - Regional Startup Solverthon Competition
    Received the Special Award at the Regional Startup Solverthon Competition from the Director of the Seoul National University University Alliance Regional Talent Development Project Group.
  • 2024.11.06
    Excellence Award - Sejong Big Data Analysis Idea Contest
    Proposed a strategy to boost tourism by analyzing bus card data related to major festivals in Sejong City. Responsible for building a MySQL database with raw bus card data and performing SQL-based correlation and principal component analysis. Received the Excellence Award from the Mayor of Sejong.
  • 2021.07.07
    Excellence Award - KEPCO KDN Innovation Idea Contest
    Proposed an AI-based electric vehicle charging station management and optimal allocation system to support the acceleration of EV adoption. Received the Excellence Award from the President of KEPCO KDN.
  • 2021.04.20
    Grand Prize - National Park Visitor Service Idea Contest
    Suggested an AI-based national park recommendation system tailored to the rise in family-oriented travel. Received the Grand Prize from the Minister of Environment.
  • 2019
    Special Award - Samsung Junior Software Creative Competition
    Received a Special Award from Samsung Electronics for developing an application that helps quickly identify a patient's underlying medical conditions and guardian contact information during emergency situations.
  • 2018
    Award - World Robot Olympiad
    Awarded at The 20th International Robot Olympiad during high school.

Certificates

Human Resources Development Service of Korea
2026-06-13
Korea Data Agency
2023-12-15

Skills

Infrastructure & DevOps
Linux
Docker
Programming Languages
C (Proficient)
Python (Intermediate)
C++ (Intermediate)
Java (Basic)
Hardware & Embedded Systems
Verilog HDL
FPGA Design and Simulation

Research Experience

  • 2026.07 - Present

    Suwon, South Korea

    Undergraduate Research Intern — ANNS Optimization
    AISA (Accelerated Intelligent System and Architecture) Research Group, Ajou University
    Advised by Prof. Young H. Oh. Researching system-level optimization of Approximate Nearest Neighbor Search (ANNS), the core retrieval workload behind vector databases and LLM RAG pipelines.
    • Studying graph-based ANNS indexes (e.g., HNSW) and vector quantization to improve the throughput–recall trade-off under tight memory and latency budgets.
    • Profiling ANNS workloads across the full system stack to pinpoint compute- and memory-bound bottlenecks.
    • Benchmarking ANNS implementations on standard vector-search datasets to evaluate recall–QPS trade-offs.

Languages

Korean
Native speaker
English
Fluent

Interests

Distributed and Parallel Systems
Approximate Nearest Neighbor Search (ANNS)
Vector Databases
Cluster Computing
Distributed Parallel Computing
Distributed Storage Systems
Database Systems
Hardware Accelerator
Hardware Accelerator Architectures (e.g. FPGA, GPU)
Compilers & Toolchains
LLVM / Clang, LLVM IR, MLIR
Compiler internals at the software/hardware boundary

Extracurricular

2022-03-01 ~ PRESENT
Double bass (contrabass) player in a Ajou University orchestra. performed in regular concerts and participated in section rehearsals and ensemble coordination.
  • Performed in the 2022 Regular Concert
  • Performed in the 2025 Regular Concert