Senior Backend Engineer, 8+ years, based in Seoul, South Korea 🇰🇷

I build the calculation and decision layers of aviation and logistics systems, where a wrong number keeps an aircraft on the ground. Java and Spring Boot mostly, Go on my own projects. I treat SQL performance as part of my job rather than something to hand to a DBA.

• Aviation systems — aircraft weight & balance, load optimization, flight operations
• High-throughput messaging — Kafka pipelines over carrier gateways that behave inconsistently
• Batch and scheduling — restartable Spring Batch with checkpointing, replacing cron jobs that fail silently
• SQL performance — query rewrites and indexing, usually cheaper than new infrastructure
• Developer experience — internal CLIs, code generation, workflow automation

Zero-dependency CLI that frees whichever process holds a port. Windows, macOS, Linux, FreeBSD. JSON output, typed exit codes.

Captures a project's tooling, config, and folder layout into a SHA-256-verified profile, then replays it into a new repo. Secrets never enter a profile.

PATH shim that rewrites one CLI flag and execs the real binary untouched. POSIX sh and PowerShell, no dependencies, under 100 lines per platform, stdin/stdout/exit codes preserved exactly.

⚡ Designing systems that are reliable, observable, and a joy to operate.