Finalist / AI Problem SolverFeatured
Selected as one of 60 finalists from 5,341 participants and built Icon Spread Radar at the MUSINSA track's offline final
Python 3CodexGrokAI HarnessJSONRule Engine
Hey, I'm Ian Kim
Available for backend work
I build things that don't break.
Backend developer who ships practical APIs and keeps the details boring. Slow? Fixed. Fragile? Hardened. Not deployed yet? Built.
The short version.
I work closest to backend systems, infrastructure, and the product edges where reliability actually shows up.
Most of my recent work has involved Claude Code, Codex, and harness engineering. I focus on tightening development automation and repeatable verification flows.
Technologies
KotlinSpring BootJavaPostgreSQLMySQLRedisRabbitMQDockerKubernetesAWSTerraformArgoCDGitHub ActionsCodexClaude Code
My experience with stuff.
2026.03 — Present
Korea
Backend Developer
TeamNooooK Studio
Migrated the ReadingGarden app backend from Python/Django to Kotlin/Spring Boot and moved the entire infrastructure from AWS EC2 to Oracle Cloud A1. Joined the dog and cat care management app from the planning stage and own its backend (currently in planning).
KotlinSpring BootPostgreSQLDockerGitHub ActionsOracle Cloud A1
2025.02 — 2025.12
Korea
Backend Developer / 대리
CompanyNailTocToc
Designed the initial backend and infrastructure architecture and built the entire AWS EKS Kubernetes infrastructure single-handedly (ArgoCD GitOps Blue-Green, Terraform IaC). Contributed broadly across all seven microservices, supporting stable operations and quality across the platform.
KotlinSpring Boot 3PostgreSQLRedisRabbitMQAWS EKSTerraformArgoCD
2024.08 — 2025.02
Korea
Backend Developer / 주임
CompanyMining5000
Single-handedly drove three client projects end to end — from on-site sales meetings and initial PoC to requirement design and development. Delivered Clova OCR/OpenAI data processing, Pinecone-based collaboration recommendations, and RPA automation.
KotlinSpring Boot 3MySQLOpenAI APIPineconeClova OCRBrity RPA
2023.04 — 2024.08
Korea
Backend Developer
TeamArffy
On the Arffy team project, built the backend for a vintage lighting store. As one of two backend developers, I owned all user-facing APIs — order concurrency control with pessimistic locking, personal-data encryption via JPA Converter, JWT/Kakao OAuth, and PortOne payments — and operated the live service for nine months.
KotlinSpring Boot 2MySQLAWS EC2AWS S3DockerPortOne
How I can help you build.
01
Backend API Development
Design and build APIs with clear contracts, practical data models, and deployment-aware behavior.
- Spring Boot
- Kotlin
- PostgreSQL
02
Migration and Modernization
Move legacy behavior into newer stacks without breaking the clients and workflows already depending on it.
- Django
- Spring Boot
- Contract Tests
03
Deployment and Operations
Set up deploy flows, health checks, logs, and local docs so systems are easier to run after the first release.
- Docker
- Kubernetes
- AWS
04
Product-Facing Backend Support
Trace bugs across app and server boundaries, preserve intended behavior, and make fixes that survive real use.
- Flutter
- Prometheus
- Loki
- Grafana
Say hey.
Always open to a practical build, a backend cleanup, or a production problem that needs a calm pair of hands.
© 2026 Ian Kim