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
Registered as patent inventor for insurance underwriting automation logic
TypeScriptKoa.jsNext.jsPostgreSQLSSTAWS ECS/LambdaGrafana
01 / 09
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

29 events
2026.03PERSONAL
Launched Vocady AI vocabulary learning app (App Store / Google Play)
2026.01WORK
Bopl Chatbot project completed
2025.12PERSONAL
Launched Random Chat app for Koreans (App Store / Google Play)
2025.11WORK
Cancer Risk Analyzer — Built medical history analysis server for Kiosk system
2025.10WORK
Bopl Chatbot — Started real-time AI consulting system
2025.09WORK
Business trip to Spain for BizCrush partnership meeting
2025.08WORK
Mohae — Started backend development for health habit challenge service
2025.02WORK
WeCrush — Started Go/gRPC backend server development
2024.05COMMUNITY
Joined YAPP IT Club
2024.05WORK
Insurance analysis service Coverage AI report development
2024.04COMMUNITY
Teo's Sprint 17th — Operating Team Member
2024WORK
Sigma gRPC microservice development
2024COMMUNITY
Teo's Sprint 15th 'Are You T?' project - 20K views in 1 week
2023.10COMMUNITY
Contributed Korean translation for Bonfire Flutter package
2023.10COMMUNITY
Teo's Sprint 16th — Participant
2023.10WORK
Smart Insurance Underwriting — Started AI underwriting platform
2023.09AWARD
2023 Corporate Hackathon Grand Prize (36 teams, 110+ participants)
2023.09AWARD
Sojuton Vacation Hackathon Award
2023.09WORK
AI Health Consultation & Coaching service started
2023.09AWARD
Solo Dev Competition Entry (Gesture-based Tetris)
2023.07WORK
Go chat server prototype development
2023.06COMMUNITY
Teo's Sprint 15th — Participant
2023.06WORK
Joined CONCAT Inc. (Neckup)
2023.05AWARD
SeSAC Hackathon Finals (sba/SeSAC/goorm)
2023.03WORK
Cancer Risk Analyzer — Started kiosk & web service
2023.03WORK
Disease Wiki API AWS Lambda development
2023.02AWARD
Chung Ju-yung Startup Competition Round 1 Passed
2023.02COMMUNITY
Teo's Sprint 14th — Participant
2023.02WORK
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