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Portfolio 2026
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Ian KimBackend Developer
All Projects
IK.
Backend Developer / DevOps·2026

NailTocToc MSA Backend

MSA-based backend platform for nail printing service

KotlinSpring Boot 3PostgreSQLRedis

Project Details

01

Overview

MSA-based backend platform for nail printing service

02

Highlights

MSA Architecture

Domain-based separation into 7 microservices (Gateway, User, Product, Order, Payment, Admin, Worker)

API Gateway

Authentication/authorization, routing, load balancing via Spring Cloud Gateway

Infrastructure

AWS EKS Kubernetes cluster operation, codified with Terraform IaC

CI/CD

ArgoCD GitOps Blue-Green deployment with zero-downtime and automatic rollback

Message Queue

RabbitMQ async processing reducing inter-service coupling

DB Optimization

PostgreSQL Read/Write Replica separation for read load distribution

Screenshots

NailTocToc App Store screenshot 1
NailTocToc App Store screenshot 2
NailTocToc App Store screenshot 3

Previous

ReadingGarden Kotlin Migration Backend

Legacy-compatible migration project that replaced the Django backend of an existing Flutter reading log app with Kotlin/Spring Boot

Next

NailTocToc Kiosk

Flutter-based kiosk application for nail printing service