CV
Basics
| Name | Jihyeon Jeong |
| Label | Aspiring Backend & Infrastructure Engineer · Undergraduate Researcher |
| 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. LLVM contributor with an interest in Approximate Nearest Neighbor Search (ANNS). |
Open Source Contributions
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LLVM Project
Open Source Contributor
Contributing to LLVM libc, compiler optimizations, and X86 code generation through implementation, regression tests, and upstream code review.
PR statuses checked on .
Projects
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
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.
- 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
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.
- 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
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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
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2021.03 - Present Suwon, South Korea
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
Korea Data Agency
2023-09-15
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
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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 Activities
Mentee · MSIT / NIPA, South Korea
2026-07-11 ~ Present
Selected for the LLVM track of OSSCA 2026 and participating in mentorship on upstream development and community collaboration.
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
- Performed in the 2026 Regular Concert