- Designed and implemented scalable RESTful APIs for the ODN mobile app- Set up and managed CI/CD pipelines using Jenkins, Docker, and AWS, integrating development and production environments.- Improved daily survey creation API, reducing processing time from 90 seconds to 17 seconds through batch processing and efficient database operations.- developed extensive unit tests with database cleaning per each test to ensure service reliability and correctness

- Created a system to detect fire and intrusion using sound intensity, based on a patented method.- Developed an Android app with Kotlin and Jetpack Compose for sound emission and recording, utilizing Firebase for storage.- Built a Python algorithm for sound intensity analysis and converted it to Kotlin for Android integration.- Led a team pivoting to web-based development using Nest.js, overseeing backend development, server architecture, and API creation.

- Developed a food ordering chatbot using AIML, demonstrating the platform's capabilities at exhibitions.- Developed marketing strategies using data from Naver Data Lab and managed brand registration and product catalog design on Amazon.