Hi, I'm Hyunwoo Seo.
Full-stack engineer with 5+ years of experience, entrepreneur, and a maker who can build anything. Based in Seoul, South Korea.
Now
Right now I'm deep into AX (AI transformation), using AI to automate workflows and erase the inefficiencies nobody ever had time to fix. Stamping out vibe-coded experiments as fast as I can, looking for which ones are worth committing to. Living as a digital nomad, meeting people, and setting up this site to write more in public.
That said, I care less about the field than whether the business actually works. I'm open to founding anything that has a real, viable model, in AX or anywhere else. Reach out if you've got an idea worth starting.
Last updated: 2026.05
Work
- 2024 – 2026 · Co-founder & CTO at Moulder
- 2020 – 2022 · Frontend Engineer at Qanda (Mathpresso)
Education
- 2018 – 2025 · B.S. in Computer Science, Yonsei University
- 2020 · Exchange semester, Uppsala University (Sweden)
Projects
Moulder
Co-founder / CTO · 2024.06 – 2026.04 Turning a single floor plan into a photorealistic 3D room in minutes with AI.
Architecture and interior design is one of the few industries AI hasn't really touched yet. Practitioners still draft floor plans in 20-year-old software, rebuild every 3D model by hand, and redo it by eye for each revision. Moulder set out to drag that workflow into the AI era, with 2D-to-3D as the core technical bet.
- Built the web SaaS covering AutoCAD drawing upload, in-browser canvas rendering, user auth, and image and file serving.
- TypeScript, Next.js, React, Tailwind, Konva, Auth.js, imgproxy, PostgreSQL, Redis, Vercel, GCP
- Built the backend that parses 2D AutoCAD floor plans and converts them into machine-readable data.
- Python, Quart, ezdxf, OpenCV, Vertex AI, Redis, AWS EC2
- Automated 3D SketchUp file generation from 2D floor plan data.
- SketchUp Ruby API, SketchUp C API, AWS EC2
Qanda
Frontend Engineer · 2020.08 – 2022.12 Worked across the main Qanda app, qanda.ai web, and Qanda Tutor web.
- Built qanda.ai from the ground up; led SEO and performance optimization.
- TypeScript, Next.js, React, styled-components, etc.
- Built the search-result webview embedded in the Qanda app.
- TypeScript, Next.js, React, styled-components, Firebase, Express, etc.
- Built the frontend for Qanda Tutor (tutor.qanda.ai).
- TypeScript, Next.js, React, styled-components, Cypress, Jest, etc.
Side Projects & Contract Work
YDevBook
2023.12 – 2024.03 · preview A hiring platform that lets university student developers join startup teams with just a lightweight profile.
PlapENM
2023.07 – 2023.10 · preview A contract project building the corporate site for a tennis-influencer MCN.
binance-futures-bot
2022.03 – 2022.07 A contract project building an automated trading bot for Bitcoin futures.
The Long Game
Why do I play this game? I have a dream of building a startup of my own from zero, with my own hands. Something that starts small and grows on a real startup curve. Not the linear ceiling of self-employment, but something that compounds over time.
Interests
On the work side, I'm drawn to AX, automation, and the tricky, hacky kind of software that makes a whole workflow disappear.
Music is the other half. I play piano and guitar, and write in a DAW. The funny thing is, composing AI doesn't pull me, but AI that listens does. Same goes for the rest of the underexplored music software space.
When I'm off the screen, it's tennis, the gym, running, and books.
Writing
Empty for the moment. Posts will land here as I publish them.