Backend engineer who works across the full IoT stack from sensor firmware and hardware prototyping to the server infrastructure that collects, processes, and monitors device data.

My background spans industrial safety IoT, platform server development, and startup operations.
I find the right technology for the problem, and pick it up fast when I don't already know it.

Primary  ·  actively used in production

Secondary  ·  shipped with support from existing codebase

Experienced  ·  applied to meet project requirements

Hardware

Tooling

PJT-Classified — Real-time participation management, distributed locking for quota control, event-driven architecture with SQS.

Fixelsoft — Backend development for multiple services including a running watch app server (wearable data ingestion & processing), silo volume measurement backend, park golf platform infrastructure migration, and maintenance of 7 golf-related services.

SPESYS — Built platform backends (EHS, safety compliance, attendance, real-time matching) and led IoT hardware development end-to-end: sensor design → firmware → data collection server → monitoring dashboard.
Key protocols: LoRaWAN, BLE. Key domains: construction safety, industrial equipment monitoring.

GSiL — Internalized the full hardware development process from scratch (previously outsourced).
Delivered IoT safety devices for Samsung C&T, Samsung E&A, KEPCO, LH, KOMIPO and others.
Started server development here alongside hardware work.

모두의성지  ·  modusj.com — Reverse auction platform for mobile phones. Users post device requirements and carriers/dealers compete with offers in real time. Currently live.

UNIST — Mechanical & Aerospace Engineering / Industrial Design  2011 – 2019

• CodeStates Backend Bootcamp  2022
• NASA World Creativity Olympiad — Silver Medal  2012
• Shinhan Card Fintech Competition — Excellence Award  2017
• Solar Business Idea Competition — Grand Prize  2017