Backend & systems-focused developer interested in reliable APIs, workflow automation, transaction-oriented design, and data-driven backend services.

Python · Java · JavaScript · FastAPI · Spring Boot · Node.js · Docker · SQL

I build backend systems that collect real-world data, process it through structured workflows, and expose reliable services through APIs, automation jobs, or notification pipelines.

My projects focus on:

• Backend architecture and API design
• Workflow-oriented business systems
• Transaction and consistency concerns
• Data collection, crawling, and automation
• Notification and monitoring pipelines
• Dockerized service deployment

I am especially interested in backend systems where correctness, state management, and operational reliability matter more than simple CRUD behavior.

AI-assisted backend recommendation platform that crawls job postings, extracts hiring signals, and generates explainable job recommendations.

Focus: FastAPI architecture, AI-assisted analysis, scoring pipeline, repository/service/scoring separation, Dockerized backend

Tech: Python · FastAPI · SQLAlchemy · OpenAI API · Docker · Next.js

Enterprise workflow backend prototype modeling ERP-style material-management processes such as purchase request, purchase order, goods receipt, and inventory updates.

Focus: PR-to-PO-to-GR lifecycle, service separation, JWT auth, Redis sessions, PostgreSQL persistence, Dockerized service architecture

Tech: Node.js · FastAPI · PostgreSQL · Redis · JWT · Docker · Nginx

Spring Boot financial-transfer backend prototype exploring transaction boundaries, validation rules, pessimistic locking, and transfer lifecycle modeling.

Focus: Transfer validation, transaction-boundary learning, failure-state considerations, concurrency risks, financial backend design trade-offs

Tech: Java · Spring Boot · Spring Data JPA · MySQL · Gradle

Backend decision-support system for campus shuttle operations, integrating schedule logic, weather signals, congestion context, and FCM notifications.

Focus: Operational decision logic, notification workflow, external API integration, backend/mobile separation, server-side rule orchestration

Tech: Node.js · Express · MySQL · Firebase Cloud Messaging · OpenWeather · Android WebView

Lightweight Python hotdeal monitoring service with Discord notifications, duplicate prevention, and server-friendly crawler operation.

Focus: Web crawling, Discord notification workflow, JSON state tracking, failure-aware monitoring, site-level crawler configuration

Tech: Python · BeautifulSoup · Discord Webhook · GitHub Actions

Python automation service that monitors WorldJob notices, persists processing state, and sends Discord notifications through a scheduled backend workflow.

Focus: Scheduled automation, SQLite checkpointing, duplicate notification prevention, FastAPI operational endpoints

Tech: Python · FastAPI · APScheduler · SQLite · BeautifulSoup · Discord Webhook

Python · Java · JavaScript

FastAPI · Spring Boot · Node.js · Express · REST APIs

PostgreSQL · MySQL · SQLite · Redis · SQLAlchemy · Spring Data JPA

Web Crawling · APScheduler · BeautifulSoup · Discord Webhooks · Notification Pipelines

Docker · Docker Compose · Nginx · Linux · Cloud VM · systemd · GitHub Actions

• Backend system design
• Transaction processing and consistency
• Workflow automation
• Data pipelines and monitoring
• API design and service boundaries
• Operational reliability
• Financial and enterprise backend systems

I am currently improving my portfolio around:

• More test coverage for business logic
• Cleaner service boundaries
• Transaction and concurrency correctness
• Dockerized deployment workflows
• Observability, logging, and operational documentation

Seoul, South Korea