Experience

토스증권 (Toss Securities)

• South Korea
• Financial Services
• 1 - 100 Employee

• Server Developer

  • Nov 2021 - Present

  토스증권 Building the market data platform(시세 플랫폼) from the scratch for both of Korea and US market. It can process 22K+ TPS events with the latency less than 1 ms.(95 percentile) Tech: Java/Kotlin, Spring, Netty, Kafka, Redis, MySQL etc. 토스증권 Building the market data platform(시세 플랫폼) from the scratch for both of Korea and US market. It can process 22K+ TPS events with the latency less than 1 ms.(95 percentile) Tech: Java/Kotlin, Spring, Netty, Kafka, Redis, MySQL etc.



HYPERCONNECT

• South Korea
• IT Services and IT Consulting
• 200 - 300 Employee

• Software Developer

  • Apr 2021 - Nov 2021

  Launched N:M video livestream service called Azar Live. Tech: Kotlin, Spring boot, MySQL, AWS etc. Launched N:M video livestream service called Azar Live. Tech: Kotlin, Spring boot, MySQL, AWS etc.



SK Telecom

• South Korea
• Telecommunications
• 700 & Above Employee

• Software Developer

  • Mar 2018 - Apr 2021

  Developed the backend of mobility service called ‘T Map Taxi’ from the scratch. Especially implemented real-time event process and call matching system. Implemented web and web socket APIs for mobile applications and administrative tools. Tech: Java, Spring boot/cloud, Netty, RabbitMQ, Redis, MySQL, Golang, Python, backbone.js on microservice architecture. Developed the backend of mobility service called ‘T Map Taxi’ from the scratch. Especially implemented real-time event process and call matching system. Implemented web and web socket APIs for mobile applications and administrative tools. Tech: Java, Spring boot/cloud, Netty, RabbitMQ, Redis, MySQL, Golang, Python, backbone.js on microservice architecture.



Coupang

• South Korea
• Technology, Information and Internet
• 700 & Above Employee

• Senior Software Developer

  • Dec 2015 - Mar 2018

  Developed the retail product registration system from the scratch and open API for market vendors. Developed the regular delivery service for the frontend and backend, Android application as full stack engineer. Primary tech stacks are the follow: Java, Spring framework, Javascript, ReactJS, jQuery, HTML, CSS, Kafka, MySQL, Android framework, RxJava, etc on micro service architecture with AWS. Working together with the engineers at both Shanghai in China and Seattle in US. Developed the retail product registration system from the scratch and open API for market vendors. Developed the regular delivery service for the frontend and backend, Android application as full stack engineer. Primary tech stacks are the follow: Java, Spring framework, Javascript, ReactJS, jQuery, HTML, CSS, Kafka, MySQL, Android framework, RxJava, etc on micro service architecture with AWS. Working together with the engineers at both Shanghai in China and Seattle in US.



LG Electronics

• South Korea
• Computers and Electronics Manufacturing
• 700 & Above Employee

• Software Developer

  • Jun 2013 - Oct 2015

  Developed the calendar and weather applications embedded in all LG smart devcies. Primary tech stacks are the follow: Java, Android framework, RxJava. Finalist in LG algorithm competition. Awarded 'Best UX app'. Attended company-venture program for 6 months, the subject was '3D VR Display'. Developed the calendar and weather applications embedded in all LG smart devcies. Primary tech stacks are the follow: Java, Android framework, RxJava. Finalist in LG algorithm competition. Awarded 'Best UX app'. Attended company-venture program for 6 months, the subject was '3D VR Display'.



Pantech Wireless, Inc.

• Telecommunications
• 200 - 300 Employee

• Research Engineer

  • Jan 2009 - May 2013

  Developed the mobile applications such as GPS Logger, Social Gallery, Weather. Developed the messaging system sending SMS and MMS on feature phone. Primary teck stacks are follow: Java, Android framework, C, Visual Basic. Worked with partners such as Verizon and AT&T in US, KDDI at Japan. Developed the mobile applications such as GPS Logger, Social Gallery, Weather. Developed the messaging system sending SMS and MMS on feature phone. Primary teck stacks are follow: Java, Android framework, C, Visual Basic. Worked with partners such as Verizon and AT&T in US, KDDI at Japan.



Continental

• Germany
• Motor Vehicle Manufacturing
• 700 & Above Employee

• Software Engineering Intern

  • Dec 2007 - Feb 2008

  Support the automobile ventilation system development. Support the automobile ventilation system development.