Engineering the quiet reliability behind great products.
A backend developer specializing in Java, Spring Boot and MySQL — turning complex requirements into stable, scalable systems. Currently based in New Zealand, with experience across Korea and Japan, from payment platforms and recommendation engines to AI-driven simulators.
Dependable systems, built end to end.
I design and build backend systems with Java & Spring Boot — and ship the React & Next.js frontends that sit on top of them.
My focus is deep analysis and continuous improvement — fewer failures, cleaner CI/CD pipelines with Docker and Jenkins, and predictable releases. I currently pair that practice with a Master's in Artificial Intelligence.
A backend craft, with full-stack range.
The backbone of every service I build — JPA, QueryDSL, Spring Security and JUnit, designed for stability and tested for failure.
I build the interfaces that sit on top of my APIs — component-driven React and Next.js frontends, wired straight into the backend.
Languages & Frameworks
Infrastructure & DevOps
Data & Storage
Ways of working
Vibe coding — shipping faster with AI agents.
I build with Claude Code & Claude Design as part of my daily craft — orchestrating specialized agents to plan, build, test and document software with a stability-first discipline.
I start every build by planning architecture and breaking work down with Claude Code & Claude Design — turning a vague brief into a clear, sequenced plan before a line of code is written.
I split work across specialized agents — one builds, another writes and runs the tests — so each task has a focused owner and a clear definition of done.
Automated hooks check every change as it lands — linting, tests and guardrails run on each step, raising stability and catching regressions before they ship.
Running several agents in parallel on independent tracks lets me maximize throughput — multiple features and fixes progressing at once instead of one at a time.
The same workflow produces the deliverables around the code too — written manuals, onboarding guides and walkthrough videos generated alongside the build.
Plan, separate, verify, repeat — an AI-native loop that keeps velocity high without trading away the reliability my backend work is built on.
Ten years, five teams, three countries.
Built a supplement e-commerce mall from zero, including a hierarchical (multi-level) settlement system for commission distribution. Currently building an ML-powered health-assessment and supplement-recommendation system. Java backend, Next.js frontend, CI/CD pipelines, server infrastructure and MySQL administration, architected and shipped end to end.
Built an e-commerce shopping mall end to end on a contract basis — a Spring Boot backend paired with a Next.js 14 frontend.
Maintained and improved a commerce platform: rebuilt the payment-gate module, added a coupon system and an ML recommendation engine, and migrated legacy PHP logic into Spring.
Led ticketing and management systems for a cable-car operator, a tug-management platform, marina/boarding systems and an unmanned self-checkout kiosk.
Built a cash-payment module for hotel check-in kiosks, communicating with a cash-counting machine over Named Pipes, plus a simulator for testing.
Developed marine simulators and a passenger-evacuation simulator using A* pathfinding and reinforcement learning, plus data gateways across multiple simulators.
Systems shipped, problems solved.
An ML-powered system that assesses a customer's health and recommends the right supplements — in active development. Machine-learning models served through a FastAPI backend.
A supplement e-commerce mall built from zero, featuring a hierarchical multi-level settlement system for commission distribution and a personalized health-food recommendation engine.
A full shopping mall built end to end for a freelance client — Spring Boot backend with a Next.js 14 frontend, from storefront to checkout.
A machine-learning recommendation engine integrated into the commerce backend, serving personalized product suggestions in real time.
Rebuilt the payment-gate module and designed a flexible coupon system spanning users, products and combined offers.
Migrated a legacy PHP codebase into a clean Spring backend, with a new authority-management module for administrators.
Built three ticketing sites, a total-management console and electronic display boards for a cable-car operator.
A passenger-evacuation simulator using A* pathfinding and reinforcement learning for marine disaster-response training.
A WPF module enabling cash payment on hotel check-in kiosks, communicating with a cash-counting machine over Named Pipes.
Always studying.
Let's build something reliable together.
Open to backend and full-stack roles. Available one week after offer confirmation.