Joonmo Jeong i3months
Software Engineer
INTRODUCE
Last updated 2026. 09. 02
Because I enjoy defining problems myself and solving them, I have owned services end to end, from planning through development and operation. When a problem would not yield, I looked one layer down, and the answer was always in the underlying principles. That is why, as much as I work with new technologies, I invest time in solidifying the ground beneath them.
I believe the output of Agentic AI is shaped less by the performance of the model than by the harness a project needs. I organize the documents and rules, and turn the mistakes I repeatedly miss into Skills and Hooks that verify the work. Even when I work with AI, I still decide what to build and why, and judge whether the result is right. My goal is to be an engineer who keeps that standard of judgment and can speak about the software I build with conviction of my own.
I believe technology creates its greatest value when it connects with other domains, and that this connection begins with close communication between engineering and business. And so, in collaboration, I work to understand precisely what problem we are solving. Sharing that understanding with my team, I want to become a developer who solves ever larger problems together with them.
EXPERIENCE
2 Years
IWAZ (South Korea)
Intelligent Technology Department Staff2024. 02 – 2025. 031 Year 2 Months
- Collaborated with a 10-member team of designers, developers, and planners to develop and operate DBpia and its related services.
- Developed features for the Chemical Information Platform Service at the Korea Research Institute of Chemical Technology (KRICT) – Query tuning, data migration, and visualization.
- Enhanced functionalities of the DBpia service – Maintenance and additional development of the back office and the DBpia system.
- Developed and maintained DBpia Content Maker (DCM), a research paper metadata creation platform – New service development and operation.
CHIRON SOFT (South Korea)
Research & Development Department Researcher2023. 03 – 2024. 021 Year
- Collaborated with a 5-member team of designers and developers to develop research institute and public service projects.
- Developed the ASD Screening AI Integrated Platform System – New service development.
- Enhanced functionalities of the ETRI School website – Unified student and faculty data and developed the back office.
- Developed the Drone Mission Data Management System – Built a scheduler for drone data storage.
- Enhanced functionalities of the National Supercomputing Center (KSC) website – Maintenance and additional development of the KSC website.
PROJECT
PACK UP - Developed and Operated an Experience Booking Platform Connecting Travelers and Local Hosts
Team Project (Planning, Development, Deployment & Operation)2025. 02 – Present
- packup.asia
- Owned the entire process from planning to development, deployment, and operation - in service after launching on Google Play and the App Store.
- System Composition
- React Native app, React admin, Spring Boot backend.
- Five servers split by role - core, payment, chat, admin, and batch.
- Integrated PayLetter, KakaoPay, and KG Inicis payment gateways (payment isolated in its own server).
- Built on GCP - Compute Engine, Docker Compose, Cloud SQL, Cloud Storage, and Firebase.
- Put Cloudflare in front as a proxy for DDoS mitigation and edge caching.
- Infrastructure & Operations
- Layered traffic protection - DDoS mitigation and TLS, SQL injection and XSS pattern blocking, and per-IP login and per-user request limits.
- Isolated batch work in a dedicated server - pinned to a single instance to prevent duplicate runs, with execution history recorded automatically.
- Moved from Cloud Run to Compute Engine - cut server cost by switching to an always-on VM.
- Set up Sentry error tracking, Cloud Monitoring uptime checks, and budget alerts.
- Consolidated external integrations into one shared infrastructure module - translation, maps, push, and storage/payment clients shared across all five servers.
- Software Architecture
- Shared database and domain module architecture - booking and payment run in a single transaction for consistency, while notifications are dispatched asynchronously after commit.
- Adopted Feature-Sliced Design (FSD) for the React Native frontend.
- Split push delivery by platform - iOS goes straight to APNs to work around React Native constraints, while Android uses FCM multicast.
- Split services into units an AI agent can grasp at once, with per-service context documents.
- AI-Assisted Development
- Built an AI development harness tailored to the project - per-service context documents, a domain glossary, and explicit rules for what is never delegated.
- Automated repetitive work with Claude Code Skills - i18n keys across 7 languages, exception type updates.
- Used Claude Code Hooks to hard-block frequent mistakes such as hardcoded secrets and production database misconfiguration at tool-execution time.
- Ran review-only agents across four angles - concurrency, security, schema, and i18n - separating review authority from implementation.
STACK UP - Developed and Operated an AI Interview Platform for IT Roles
Team Project (Development Lead / AI Server)2026. 01 – Present
- GitHub Repository
- Served as development lead and AI server developer - designed the AI pipeline and the software architecture.
- RAG Retrieval System
- Chunked documents recursively by heading, paragraph, line, and word.
- Prefixed each chunk with a document summary and its heading path to preserve context (lightweight Contextual Retrieval).
- Separated embedding prefixes for indexing and search, storing the vectors in pgvector.
- Ran keyword search alongside vector search to match technical terms the vectors miss, fusing rankings with RRF.
- Designed a fallback path so generation continues from the base context when retrieval fails or times out.
- Question Generation & Answer Scoring
- Managed the question pool as breadth × depth × k - topics are opened and weak points probed, ending at the session-wide question cap.
- Separated RAG queries by stage - opening questions from the job role and document summary, follow-ups from the previous question and answer.
- Scored answers on four axes - specificity, logic, structure, and correctness - branching the criteria by question category.
- Verified the correctness axis against evidence retrieved through RAG.
- Integrated STT and extracted speech metrics such as speaking rate and silence for the report.
- Final Feedback & Model Operations
- Staged scoring - per-answer LLM rating, averaging and normalization, then an LLM summary - smoothing score variance.
- Models split by stage - a larger model for analysis, opening questions, and the summary, a lightweight one for follow-ups.
- Temperature split by model tier - 0.2 for analysis and judgment, 0.4 for follow-up questions.
- Spawned an interviewer persona per job role in the session, scoring in parallel against role-specific criteria to derive the overall score.
- AI-Assisted Development
- Ran development as a multi-agent workflow, assigning planning, design, implementation, and testing to dedicated agents.
- Passed each stage’s artifact to the next agent as input - design is settled before implementation starts, and testing closes the loop.
- Built an AI development harness with project-specific context documents and rules that standardize each agent’s role and artifact format.
Embedded Challenge - Autonomous Maze Navigation Robot on STM32
CNU Embedded Challenge (2-person team)2026. 04 – 2026. 06
- GitHub Repository
- Practice run (full completion) video
- Built a maze-navigating autonomous robot on STM32F429 and FreeRTOS, combining ultrasonic and infrared sensors.
- Designed an FSM navigation algorithm that detects intersections from lateral-wall distance changes and branches on heading.
- Corrected odometry drift with EKF sensor fusion, navigating on a lateral-wall heading observation in the absence of an IMU.
- Separated sensing and control with four FreeRTOS tasks (sensing, IR, control, debug) under preemptive scheduling and lock-free shared state.
- Encoder-based 90-degree turn calibration and compensation for left/right motor output asymmetry.
Developed UniScope - A Platform for Nationwide University Information
KakaoTechCampus (South Korea, Tech Lead)2025. 08 – 2025. 11
- GitHub Repository
- Served as Tech Lead - designed the software architecture and led the overall development process.
- Kakao Tech Campus Final Presentation - UniScope, an integrated platform for nationwide university information
- Documented UI components across the project using Storybook to enhance reusability and improve development speed and design consistency.
- Built an E2E testing environment using Playwright and automated actual browser-based UI flows and key business logic.
- Improved page structure and performance to achieve high scores across 4 Lighthouse metrics, and enhanced initial accessibility through meta tag-based SEO optimization.
- Applied Husky at the pre-commit stage to enforce linting rules and built a CI/CD pipeline based on GitHub Actions.
- Introduced Feature Sliced Design (FSD) architecture and established related team guidelines to ensure maintainability and scalability
- Designed a deployment architecture integrating AWS and Vercel, and built a Blue/Green zero-downtime deployment environment using Nginx reverse proxy.
Developed features for the Chemical Information Platform Service at the Korea Research Institute of Chemical Technology (KRICT)
IWAZ (South Korea)2025. 01 – 2025. 03
- Migrated data from TIBERO to MariaDB.
- Indexing migrated data and implemented partitioning for statistical data.
- Optimized queries from TIBERO to MariaDB.
- Implemented hierarchical queries and sorting using WITH RECURSIVE and SORT_PATH.
- Refactored high-cost statistical queries, improving performance (873.231ms → 214.245ms).
- Visualized statistical data using ApexChart and implemented favorites and table search features.
Enhanced functionalities of the DBpia service
IWAZ (South Korea)2024. 04 – 2024. 12
- Integrated Redis for floating banners and developed APIs to connect the back office with the DBpia service.
- Modified Elasticsearch queries and existing mappings for the unified search feature, restructured the research paper index.
- Analyzed execution plans, reindexed data, and optimized high-cost queries (4481.926ms → 1111.281ms).
- Managed encrypted view schemas and handled encryption/decryption of sensitive information.
- Maintained DBpia service operations - fixed Excel download bugs, managed the PDF download server, and handled long-term inactive users.
Developed DBpia Content Maker (DCM), a research paper metadata production platform
IWAZ (South Korea)2024. 02 – 2024. 12
- Analyzed legacy source code written in C# and C++ and designed a new web-based system.
- Utilized Git Flow strategy for seamless collaboration, analyzed user requirements and system processes.
- Set up and managed project configurations and operations.
- Configured Spring Security with custom filters and authenticators, implemented LDAP-based AD account login.
- Customized Spring Security authentication exception handling - Implemented account lockout policy.
- Resolved DataSource TLS compatibility issue with SQL Server 2005.
- Fixed incompatibility between the latest Spring Batch version and SQL Server 2005 sequences.
- Established certificates and domains, NGINX-based reverse proxy routing for development and production servers
- Deployed and managed Tomcat on Windows Server, resolved symbolic link-related network drive permission issues
- Configured Tomcat JVM memory pool and implemented redundancy for production and development servers.
- Handled penetration testing issues, including XSS, CSRF, and sensitive data masking.
- Analyzed and optimized SQL Server Linked Server RPC overhead using OPENQUERY.
- Research Paper Metadata Production System Development
- Developed PDF splitting system (PDFBox, PDF.js) - Handled logical/physical page differentiation
- Refactored a legacy C++ batch system into Spring Batch, integrating ERP and DCM services to enhance stability and processing speed.
- Developed editor draft saving - auto-saved input every 5 minutes.
- Implemented an email-based research paper author search feature using Elasticsearch.
- Efficiency Improvements & Service Optimization
- Revamped the research paper production system, reducing metadata processing time (30 min → 15 min for 50 papers).
- Optimized batch processing, cutting publication time (3 days → 1 day).
Developed the ASD Screening AI Integrated Platform System
CHIRON SOFT (South Korea)2023. 10 – 2024. 02
- Implemented conditional branching surveys using SurveyJS.
- Transmitted video and audio data via WebSocket for real-time communication with the AI inference server.
- Visualized inference results in real-time using ApexCharts and D3.js.
- Set up system execution environment and deployed images using Docker.
- Developed JWT authentication and CRUD functionality for participants and test results using FastAPI.
- Built and developed the frontend using Vue.
Enhanced functionalities of the ETRI School website
CHIRON SOFT (South Korea)2023. 08 – 2023. 10
- Unified non-registered student and faculty data into a single table.
- Implemented bulletin board pagination and step-by-step registration using Vue Quasar.
- Developed a Spring Boot and JPA-based back-office system and integrated with the ETRI School service.
- Deployed and managed the system on ETRI's internal servers using Docker.
Developed the Drone Mission Data Management System
CHIRON SOFT (South Korea)2023. 05 – 2023. 10
- Developed batch business logic for drone data storage.
- Traversed directories using DFS and stored image metadata.
- Detected changes at the project level and updated only modified data.
- Used AtomicBoolean to ensure only one scheduler runs at a time.
- Handled scheduler tasks asynchronously with CompletableFuture.
- Conducted performance benchmarking tests considering JVM warm-up.
- Visualized image data on a map using React.
- Deployed Frontend, Backend, and Database as a unified system using docker-compose.
Enhanced functionalities of the National Supercomputing Center website
CHIRON SOFT (South Korea)2023. 03 – 2023. 05
- Redesigned the main page and developed the back-office system.
- Added an email verification step for user registration, including security measures and expiration settings for verification codes.
- Visualized supercomputer usage statistics using D3.js and optimized queries (6376.21ms → 430.71ms).
- Implemented a WebSocket-based broadcast feature for connected users.
OPEN SOURCE
awesome-static-generators
Contributor
- Added eziwiki to the Awesome Static Generators list
- https://github.com/myles/awesome-static-generators/pull/221
- Github Stars:
awesome-nextjs
Contributor
- Added eziwiki to the Documentation section of the Awesome Next.js list
- https://github.com/officialrajdeepsingh/awesome-nextjs/pull/87
- Github Stars:
awesome-docs
Contributor
- Added eziwiki to the Site Generators section of the Awesome Docs list
- https://github.com/testthedocs/awesome-docs/pull/114
- Github Stars:
eziwiki
Owner & Maintainer
- A lightweight wiki and documentation site generator built with Next.js (November 2025 - present)
- Combines Obsidian's linking model, Notion's UI/UX, and the deployment simplicity of a static site
- Graph view for document links, with tab and history navigation
- Published on npm - npx create-eziwiki
- Lighthouse - Performance 99 / Accessibility 100 / Best Practices 100 / SEO 100
- Next.js with TypeScript
- https://github.com/i3months/eziwiki
- https://eziwiki.vercel.app/
- Github Stars:
- Codacy :
SKILL
Languages
Frameworks & Libraries
Infrastructure
Databases
PUBLICATIONS & PRESENTATIONS
Quality-Aware Facial Mesh Filtering for Robust Contactless Head-Pose Assessment
ICIIBMS 2026 (International Conference on Intelligent Informatics and BioMedical Sciences) · Okinawa, Japan2026. 11
- Authors: Minseok Park, Joonmo Jeong
- Accepted · Poster presentation anticipated (2026.11.21)
Structure over Scale: A Multi-Axis Ensemble for Small-Sample Multimodal Lifelog Prediction
ICTC 2026 (International Conference on Information and Communication Technology Convergence) · Jeju, Korea2026. 10
- Authors: Joonmo Jeong, Yoonjae Kim, Minsu Kim, Prof. Jong-Ryul Lee (corresponding author)
- Under review · Poster presentation anticipated (2026.10.15)
Environment-Conditioned Hammering-Precursor Monitoring for Reliable Embedded Systems
KCC 2026 (53rd Korea Computer Congress) · Jeju, Korea2026. 06
- Authors: Minyong Jeong, Joonmo Jeong, Woojin An, Seohyeon Cho, Seungwoo Jeong, Prof. Venkatesan Muthukumar (corresponding author)
- Presented · Conference presentation (2026.06.24)
- Awarded · Encouragement Prize, Paper Competition (2026.07.31)
Awards
- 2026. 09TOPCIT Academic Excellence AwardPresident’s Award, Chungnam National University (awards ceremony on 15 September 2026)
- Ranked 1st in the university on the TOPCIT software competency assessment.
- 2026. 0753rd Korea Computer Congress (KCC 2026) Paper CompetitionEncouragement Prize, Undergraduate Division
- Presented the paper "Environment-Conditioned Hammering-Precursor Monitoring for Reliable Embedded Systems".
- 2026. 065th ETRI Human-Understanding AI Paper Competition5th place on the private leaderboard (awards ceremony in October 2026)
- Developed a model predicting sleep and well-being indicators from lifelog data.
- Paper submitted to ICTC 2026 (under review).
- 2026. 06Chungnam National University Algorithm Competition – DevDay4× Bronze Prize / 1× Encouragement Prize
- University-wide algorithm competition held every spring and fall.
- Bronze Prize in June 2026, November 2025, June 2025, and June 2022 / Encouragement Prize in November 2021.
- 2026. 01ABC Bootcamp: Data-Driven CourseExcellence Prize (SW-Centered University Project Director's Award)
- Developed "D-Village" a survival-based community building platform for small groups using React and FastAPI.
- 2025. 09Chungnam National University Generative AI ChallengeEncouragement Prize (CNU Director of Information Technology Headquarters' Award)
- Developed "PPTree" an automated lecture material generation tool using LangChain.
- 2025. 08Kakao Tech Campus 2nd Stage Outstanding Cookies SelectionTop Performance Award(FE) (1st out of 66)
- Completed the 2nd stage with the highest score in the Frontend track.
- 2023. 1211th NTIS Information Utilization CompetitionGrand Prize (Minister of Science and ICT Award)
- Developed "NTIS STUDIO" a scientific document editor using Vue and FastAPI.
- 2023. 08K-Digital Challenge: 2023 MyData Idea CompetitionExcellence Prize (Korea Data Agency President's Award)
- Developed "Trippy" a personalized travel app using Flutter.
- 2023. 062023 Environmental Data Utilization and Analysis CompetitionGrand Prize (Minister of Environment Award)
- Developed "CEAP" a platform for analyzing company-specific carbon emissions using greenhouse gas data.
- 2021. 11Chungnam National University Junior Creative Works CompetitionEncouragement Prize
- Developed a refrigerator management service using deep learning-based image recognition.
ACTIVITIES & QUALIFICATIONS
Qualifications
- Certified Kubernetes Administrator (CKA)2026. 08 – 2028. 08Cloud Native Computing Foundation
- Google Cloud Certified – Professional Cloud Architect2026. 08 – 2028. 08Google Cloud (PCA)
- AWS Certified Solutions Architect – Associate2026. 08 – 2029. 08Amazon Web Services (SAA-C03)
- TOPCIT Regular Assessment2026. 06Test of Practical Competency in IT (Level 4)
- TOEIC Speaking2026. 03 – 2028. 03Intermediate High (Speaking Score 150)
- 43rd Advanced Data Analytics Semi-Professional (ADsP)2024. 11Advanced Data Analytics Semi-Professional
- 54th Structured Query Language Developer (SQLD)2024. 09Structured Query Language Developer
Education
- Chungnam National University2021. 03 – 2027. 02Department of Computer Science and Engineering, currently in the 8th semester
Extras
- Chungnam National University Deep Learning SC Lab - Undergraduate Researcher2026. 03 – 2026. 09Selected as a CNU Summer Session Student Success ScholarResearch and development of multimodal AI services - RAG retrieval and LLM multi-agent pipeline design
- 2026 Kkumdori Scholarship Recipient2026. 08Daejeon Youth Tomorrow Foundation - one of 5 final recipients (evaluated on self-directed capability, achievement, and creativity)
- Google AI Professional Certificate Completion2026. 07Professional Certificate by Google on Coursera - 7 courses on AI-driven research, content creation, data analysis, and app building
- Chungnam National University Practical Coding Course Tutor2026. 03 – 2026. 06Assisted students in learning MSA, CI/CD (Docker, Kubernetes), Software Testing, Agentic AI, and AI-powered Development Tools
- University of Nevada, Las Vegas (UNLV) - Visiting Scholar2026. 02 – 2026. 03Howard R. Hughes College of Engineering - Embedded AI WorkshopsResearch Paper · Environment-Conditioned Hammering-Precursor Monitoring for Reliable Embedded Systems
- Seoul National University Next-Generation Semiconductor Innovation Convergence College - Undergraduate Research Intern2025. 10 – 2026. 01Research on LLM compression techniques in edge computing environments
- KakaoTechCampus 3rd Cohort - Frontend2025. 04 – 2025. 11Outstanding Kookies of Stage 2 (Top Performance Award)
- AI Career School Startup Hackathon L:AUNCH Completion2025. 09Practical AI-driven Startup Program hosted by Root Impact and sponsored by Google.org
- Chungnam National University 2025 SW-IT Contest Organizer2025. 09SW-IT Contest algorithmic contest problem design, review, and operations support