Projects Log

All projects

• Machine Monitor — A macOS menu bar monitor and dashboard for checking connectivity and storage across development machines.
• WorldClone Lab — An experiment platform for testing copy, pricing, and audience hypotheses with AI customer panels before launch, with evidence and limits alongside results.
• Parentlyze — A parenting product that turns parent-child conversations into reports and practical missions. As co-founder and CTO, I build and operate the mobile apps, web, and backend.
• Can You Baby? — Baby Replay — An IMU toy: a child moves freely for 5 seconds, a parent replays it, and a similarity score appears — built in one day at the TOYTHON physical-AI hackathon.
• Photo Archive — A personal web archive for browsing photos in a gallery and timeline.
• Recallink · macOS Menubar — A macOS companion for accessing Recallink contacts and notes from the menu bar.
• Meetup Lab — Running and attending a Private Meetup every four days since June 2024 — 200+ sessions and counting.
• Instagram Audience Manager — A local-first Chrome extension that snapshots and analyzes my Instagram audience like git — on-device, no backend.
• What if…? — Upload a chat export and simulate the parallel universe of "what if I'd said this instead" — built in one day at Cursor Hackathon Seoul.
• Caption Logger for Google Meet — A Chrome extension that logs and copies Google Meet captions locally without sending a single line off the device — zero dependencies, zero network calls.
• TrueTwo — A daily family game of two truths and one lie — built and shipped in a single day at the IndieCrew hackathon.
• Recallink · Core & Docs — Not a contacts app but a personal relationship CRM that remembers "what happened with this person." Web, app, and local DB all share the same model.
• Recallink · Web (PWA) — Recallink's web app that keeps running the same screens even when the internet drops. Logging in automatically merges with the cloud.
• Recallink · Mobile (KMP) — Recallink's Android/iOS apps. Core logic written once, with the UI built separately in each OS's native toolkit.
• Invera — A community platform for exam-takers and parents. Integrates school verification · feed · spaces · administrator operations.
• Potentivo Lab · 회사 페이지 — The official site that serves as the face of Potentivo Lab, the company I co-founded. I was personally responsible for Korean/English localization through to search and LLM visibility.
• Yonsei Mileage Viewer — A student tool that went viral for a season by showing mileage course-registration results faster than the school's official system.
• Private Build 01 · Systems — Implemented client-service integration, error handling, and recovery for software with real-time state.
• Private Build 02 · Native Software — Developed a native desktop interface and performance-sensitive processing code.
• Private Build 03 · Application Engineering — A private application with server-client state handling, input validation, and automated tests.
• Private Build 04 · Web Engineering — Built interfaces, APIs, and data validation for a private web application.
• Private Build 05 · Data Engineering — Private engineering work on data validation, access control, and operational maintenance.
• Private Build 06 · Interface Engineering — Built a web interface with complex editing state and save-and-restore behavior.
• Private Build 07 · Backend Engineering — Private software covering authentication, permissions, task state, and error handling.
• Private Build 08 · API Engineering — Developed integration APIs, data validation, and retry handling.
• Private Build 09 · Reliability Engineering — Implemented state management and testing for asynchronous work and failure handling.
• Private Build 10 · Engineering Research — Private research and development in data-format validation and repeatable tooling.
• Private Build 11 · Software Engineering — Implemented processing tasks, operational interfaces, and validation for private software.
• Private Build 12 · Web Applications — Developed web interfaces, file handling, and access control.
• Private Build 13 · Internal Tools — Builds and maintains local storage, search, and data-management interfaces for internal tools.
• UWB Autonomous Carrier — A follow-me autonomous vehicle based on UWB trilateration. Mobile positioning with 2 ESP32s and 3 DWM3000s.
• Fjord Edu — Built a college-admissions academy's booking, payment, student workflow, and internal operations platform — handling over KRW 300 million in payments in a single day without downtime.
• Liner × Insiders — A short-term prototype for the Liner collaboration (5 days).
• Cha-Go — A small build — a 1-week solo prototype.
• Cardmaru — A short-term card news content build (1 week).
• Sparkdate — A 5-day dating-concept prototype.
• Sky Talk — A 1-day quick prototype.
• Dream Chaser — A web simulation game where you raise your own idol group in 20 days — built and deployed in one day at the KeYThon hackathon.
• Credix — A P2P stablecoin lending demo that settles loans via smart contracts — planned, built, and deployed over one hackathon weekend.
• 42cursus_ft_transcendence — The final project of the 42 Seoul main curriculum — a full-stack multiplayer pong web app team project.
• 42cursus CPP Modules — 42 C++ Modules 00–09 (OOP, STL, templates, etc.)
• 42cursus Inception — Building a multi-container infrastructure based on Docker
• AIM RED · LLM Red Teaming NFT Game — An LLM red-teaming NFT game built around the concept of "AIM Squad," an elite hacker guild that attacks LLMs — won a $6,500 team prize at ETH Seoul 2024.
• 42cursus ft_irc — IRC server implementation (C++)
• LovDov — An AI influencer dating chat app · Demo Day Excellence Award.
• 42cursus_MiniRT — 3D graphics rendering using ray tracing.
• FPGA - Antarctic Adventure — The Antarctic Adventure game implemented in Verilog on an FPGA.
• 42cursus_FdF — A graphics project that represents a 3D map as a 2D image.
• Microprocessor Labs — Completed all seven CSAPP-style systems programming labs in C — Bomb, Attack, Cache, Malloc, and Proxy Lab.
• Operating System Assignments — OS coursework implementing kernel fundamentals in C — scheduling, synchronization, and memory management.
• ESP32 Drone — An autonomous drone project using an ESP32 board.
• 42cursus_netpractice — Hands-on practice with network protocols and IP address configuration.
• 42cursus_Philosophers — Solving the concurrency problem posed by the Dining Philosophers problem.
• 42cursus_minitalk — A communication program using UNIX signals.
• 42cursus_push_swap — Implementing a sorting algorithm using stacks.
• 42cursus_born2beRoot — Virtualization and Linux system administration.
• 42cursus_minishell — A program that executes shell commands like bash.
• 42cursus_ft_printf — Implementing the printf function from scratch in C.
• 42cursus_get_next_line — Implementing a function that reads one line at a time from a file descriptor.
• 42cursus_libft — Implementing standard C library functions from scratch.
• 42GG.kr — The most-used table-tennis booking and matching service inside 42 Seoul. 500+ sign-ups, and we ran a COEX booth as well.
• Computer Architecture Assignments — Designed and simulated a pipelined CPU and cache in staged computer architecture projects.
• 42_C_Piscine — The one-month admission test track for 42's main curriculum
• 2 degrees of freedom robot arm — A 2-degree-of-freedom robot arm built with Arduino · selected as an outstanding Roboin project.
• MODISCAN E1 — Scanning objects with a self-built 3D scanner and rendering them in Minecraft