Backend Engineer

Designing backends where data stays aligned
I can work full-stack, but my center of gravity is backend engineering. I validate requirements through data models and state transitions, design idempotent flows that tolerate retries and duplicate requests, and look for concurrency, missing-data, and inconsistency edge cases before they reach production.

Core Strengths

Data Fitness

Validates requirements through data models and state transitions to set storage and query boundaries that fit the domain.

Idempotent Flows

Designs idempotent processing so retries, duplicate requests, and asynchronous events do not change the final outcome.

Edge Cases

Builds operable backends by looking past the happy path into permissions, concurrency, missing data, and inconsistent states.

Tech Stack

Kotlin
Java
Spring Boot
Python
FastAPI
Redis
Kafka
RabbitMQ
PostgreSQL
MySQL
Docker
Kubernetes
Terraform
OCI
RAG Pipelines

Backend Design Lens

I look at API boundaries, transactions, async workflows, and observability together so requests, state, and data stay aligned.

Domain & API

Kotlin
Spring Boot
Validation

Data Layer

PostgreSQL
Transactions
Consistency

Async & Ops

Redis
Kafka
Observability

Data Fitness

Domain model / constraints

Idempotency

Retries / duplicate requests

Edge Cases

Concurrency / missing data

Operating Services

Backend systems shaped for operation

A compact map of work shaped around data models, API boundaries, asynchronous processing, and operating infrastructure.

Youngwon Platform

A personal platform for backend APIs, server automation, and infrastructure managed across OCI and Kubernetes as one operating boundary.

OCI
k3s
Docker
Nginx
Terraform

Backend Reliability Patterns

A working set of backend design standards I reuse: data validation, transaction boundaries, idempotent request handling, and retry/duplicate-event safeguards.

Kotlin
Spring Boot
PostgreSQL
Redis
Kafka

AI/RAG Service Lab

A service-pipeline workspace for prompt orchestration, retrieval experiments, and backend integration patterns around production-shaped AI features.

OpenAI
Python
FastAPI
Vector Search
Monitoring
Contact

Build with systems that hold up

For deeper career details, the CV page expands the architecture, performance, and infrastructure stories.