Software & DB engineer in Seoul. By day I build PostgreSQL DBaaS on a cloud platform; on the side I make small macOS menu bar apps that each fix one annoying thing, and write about the tools I actually use.
클라우드 PostgreSQL DBaaS를 만드는 소프트웨어·DB 엔지니어입니다. 퇴근 후에는 맥에서 불편한 것 하나를 고치는 작은 앱을 만들고, 직접 써 본 도구 이야기를 씁니다.
Every Mac app here: free · open source · no network access · no analytics · menu bar only
My side projects run on a small AI crew: Claude (Claude Code) writes and ships the code, Gemini does the research, and Codex gives a second-opinion review before anything touches real data. Everything below was built this way.
Exploring next: AI video and music with
| App | What it does | |
|---|---|---|
| PortableHiDPI | Sharp HiDPI (Retina) text on 14–16" portable monitors, which macOS on Apple Silicon won't offer at comfortable sizes | Download · 한국어 |
| ScrollSplit | Natural scrolling on the trackpad, regular scrolling on the mouse, at the same time | Download · 한국어 |
Both are a few hundred lines of Swift you can read in one sitting, with measured CPU/GPU numbers and a "what can go wrong" section in each README.
| Tool | What it does | |
|---|---|---|
| php-docker-hotpatch | Patch PHP in Docker WordPress/PHP containers before the official images catch up. Rebuilds from the docker-library build files with only the PHP version bumped, no prebuilt binaries | 한국어 |
Born from patching a production WordPress site during PHP2Shell (CVE-2026-109618/109619): PHP 8.3.36 was out while the official image was still on 8.3.35, and the rebuilt image was live 91 minutes later (write-up, Korean).
Samsung SDS · 2019.01 – present
| Role | |
|---|---|
| DBaaS Engineer 2024.06 – present |
DBaaS on Samsung Cloud Platform. Now building the PostgreSQL DBaaS (since 2026.06); before that OpenSearch & Elasticsearch DBaaS: automated provisioning, scaling and monitoring, control plane and platform architecture. Also backup DBaaS TA and DBA since 2025 |
| DBA, on-site at Samsung Card 2020.04 – 2024.05 |
Enterprise Oracle for the client's financial systems: SQL tuning, logical design, storage optimization, high availability, monitoring |
| Backend Developer, on-site at Samsung Card 2019.03 – 2020.03 |
Java/Spring backend for the client; in-house SW algorithm instructor (C++, Java); GDC project architect with CMC Global (Vietnam) |
Dev tools, AI tools, gear I paid for myself. No sponsorships.
Code from the videos: SubCoding: adding subtitles with Python, flying a Tello drone with Python, a C game for non-majors in 3 days, algorithm practice.
Data
Backend
Ops