Sangyoon Lee

Senior full-stack developer (13 yrs) in Seoul. Payments and backend: Spring Boot, Laravel, Node.js. Open to remote contracts. Written-only, replies within 24h.

Seoul, South Korea Joined on Sep 20, 2026 https://sellerkit.namubase.com

Education

Java full course, SBS Academy (2015-2016)

Work

Independent developer (sellerkit), previously Wego Company, KIMEDI, ING Story

Hacktoberfest Open-Source AI Challenge Week 2: Side Hustle Submission 💸

Sangyoon Lee

Oct 16

My last 38 cover letters all said something my resume didn't. So I built HonestFit.

#devchallenge #hf26challenge #ai #opensource

5 min read

Sangyoon Lee

Oct 15

Figma plugin UI has a null origin: how I read a Google Sheet without a server or API key

#figma #cors #javascript #googlesheets

2 min read

Sangyoon Lee

Oct 7

Available for remote contract work: 13-year full-stack dev (billing, admin, payments)

#career #freelance #remote #webdev

2 min read

Sangyoon Lee

Oct 5

I ran my own SEO checker on my own sites. It called every Korean page "thin"

#seo #testing #webdev #i18n

1 min read

Sangyoon Lee

Sep 25

I ship backends alone, in writing: 12 years, 6 products live right now

#career #remote #backend

3 min read

Sangyoon Lee

Sep 21

Why your Search Console API impressions don't match the UI

#seo #api #webdev #mcp

2 min read

DEV Community

Sangyoon Lee

Badges

Writing Debut

Skills/Languages

Currently hacking on

Available for

My last 38 cover letters all said something my resume didn't. So I built HonestFit.

Figma plugin UI has a null origin: how I read a Google Sheet without a server or API key

Available for remote contract work: 13-year full-stack dev (billing, admin, payments)

I ran my own SEO checker on my own sites. It called every Korean page "thin"

I ship backends alone, in writing: 12 years, 6 products live right now

Why your Search Console API impressions don't match the UI