(RÉSUMÉ · 2026.09 · SEOUL )
Jungpyo Lee
Frontend Engineer
Thirty thousand people land in the same second. The page is up in 0.9.
Lighthouse perf7399Django → Next.js migration
About
I didn't call the migration finished until seven servers were gone.
Caching isn't something you switch off. It's something you steer.
Loading, error and success, declared in one place.
The web inside the app, behaving like the app.
If the tool doesn't exist, I ship it to npm.
Work
FLATTEN
Frontend Developer
- 90%
Two weeks. Unique Sentry issues cleared with an AI agent.
- 12.56.8
Three weeks. A four-person SEO task force. Average search rank.
- 400/day
Forced logouts. Cause proven with data, then closed.
Projects
Shoeprize 슈프라이즈
One drop alert puts thirty thousand people on this page in the same second. Back then it took 8.6 seconds.
- Lighthouse perf
- from 73 to 99Django → Next.js migration
- LCP
- from 8.6 to 0.9s
- Render / web servers
- from 13 to 6
- Search clicks
- +105%SEO task force, 3 weeks
Kasina 카시나
On a screen where money moves, a single 401 spread into forced logouts. Now it ends ten minutes before expiry.
- Forced logouts
- 400/day → closed
- Tests
- 127run in 2.3s
- Token pre-refresh
- 10 min before expiry
- Concurrent 401s
- 1 refreshthe rest wait in a queue, then retry
Open source & tools
Services in production
- KnittyCat A photo becomes a knitting or cross-stitch chart.
- 먼저먹어요 A fridge that warns you before food goes to waste.
- Civic Lab Finds a policy’s blind spots before it launches.
- KnittyCat
- 2025~ · Web service · live
- 먼저먹어요
- 2026~ · “Eat first” · Apps-in-Toss mini app · live
- Civic Lab
- 2026 · AI Championship 2026 entry · in review