tastekim

Full-Stack Developer_
Based
Seoul
Status
Available
Focus
Backend
ABOUT
01

About

Full-stack developer based in Seoul. I design scalable backend systems with TypeScript and Node.js, and build cross-platform apps with Flutter.

I've spent about 3 years in InsurTech/HealthTech, shipping real products and driving measurable results through hands-on development and operations.

I'm relocating to Spain in September 2026 for a fresh start. Currently exploring opportunities in the Spanish market and excited for the next chapter.

3+
Years Exp
4
Products
97%
Performance

Tech Stack

TypeScript
JavaScript
Dart
Go
Python
{ }3 primary / 5 total
02
02

Projects

AI Insurance Underwriting PlatformOct 2023 ~ Present

Smart Insurance Underwriting

SaaS platform that automatically analyzes 100+ insurance products × 20 categories × 3/12/60 month underwriting based on health checkup and medical history. Expanded from in-house tool to GA SaaS, now serving 4 GA companies.

97.6%
Performance Boost
90.5%
Render Speed Up
4
GA Clients
Highlights
  • >Core function processing: 3,752ms → 90.81ms (97.6% improvement)
  • >Customer list query: 7,712ms → 38.9ms (~200x faster)
  • >First render: 6.52s → 0.62s (90.5% improvement)
  • >Built batch system handling 64M+ cumulative records
TypeScriptKoa.jsNext.jsPostgreSQLSSTAWS ECS/LambdaGrafana
01 / 08
03

Experience

Active
2023.02 ~ Present

CONCAT Inc.

Full-Stack Developer

Owned the entire service lifecycle in InsurTech/HealthTech—from backend architecture design to performance optimization, AWS infrastructure management, and monitoring system setup. Led junior developer code reviews and project management.

Backend
Mobile
Infra
DevOps

Timeline

19 events
2026.01PROJECT
Bopl Chatbot project completed
2025.09PROJECT
Bopl Chatbot — Started real-time AI consulting system
2025PROJECT
Mohae — Health habit challenge service development
2024.05PROJECT
Insurance analysis service Coverage AI report development
2024COMMUNITY
Joined YAPP IT Club
2024PROJECT
Sigma gRPC microservice development
2024COMMUNITY
Teo's Sprint 15th 'Are You T?' project - 20K views in 1 week
2023.10PROJECT
Smart Insurance Underwriting — Started AI underwriting platform
2023.09AWARD
2023 Corporate Hackathon Grand Prize (36 teams, 110+ participants)
2023.09AWARD
Sojuton Vacation Hackathon Award
2023.09PROJECT
AI Health Consultation & Coaching service started
2023.09AWARD
Solo Dev Competition Entry (Tetris For Everyone)
2023.07PROJECT
Go chat server prototype development
2023.05AWARD
SeSAC Hackathon Finals (sba/SeSAC/goorm)
2023.03PROJECT
Cancer Risk Analyzer — Started kiosk & web service
2023.03PROJECT
Disease Wiki API AWS Lambda development
2023.02AWARD
Chung Ju-yung Startup Competition Round 1 Passed
2023.02WORK
Joined CONCAT Inc.
2023.02PROJECT
3D conversion service (USDZ converter) development

Community

Bonfire
Contributor

Flutter Flame 2D engine official docs Korean translation

Node-ko
Member

Node.js Korean Community

YAPP
Member

IT Club (2024)

Teo's Sprint
3x Alumni

14th/15th/16th consecutive participation, 15th 20K views in 1 week

GitHub Organizations
9+
Patent
Insurance Recommendation Server Patent

Server and method for recommending suitable insurance products for insureds including pre-existing conditions

CONTACT
04

Let's Work
Together

I'm always open to discussing new projects or collaboration opportunities. Feel free to reach out anytime.

GitHubLinkedInInstagram
Location
Seoul
South Korea
Local Time (KST)
tastekim
Kim Yeonseok / Joaquim Kim

Built with Next.js & Geist Pixel

Seoul, 2026