Taejun Lee

Back End Developer(Senior) at (주)카카오헬스케어 - Kakao Healthcare Corp.
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Contact Information
us****@****om
(386) 825-5501
Location
South Korea, KR
Languages
  • Korea Native or bilingual proficiency
  • English Professional working proficiency
Skills

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Credentials

  • OCJP
    Oracle
    Apr, 2014
    - Nov, 2024
  • Engineer Information Processing(정보처리기사)
    HRD Korea
    Dec, 2013
    - Nov, 2024
  • CCNA
    Cisco
    Apr, 2014
    - Nov, 2024

Experience

  • (주)카카오헬스케어 - Kakao Healthcare Corp.
    • South Korea
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • Back End Developer(Senior)
      • Nov 2022 - Present

      VC Dev Team VC Dev Team

  • 에임
    • Backend Engineer Tech Lead
      • Nov 2021 - Nov 2022

      AIM's advisory portfolio optimization: ● Optimize an algorithm to create advisory portfolio report of ETFs by distribute them close to the target portfolio rates (django, mysql) Develop the combined payment remittance system ● Develop the old payment system which a user had to transfer a service fee to AIM's virtual account and deposite an investing money to their own KIS(Korea Investment Security) account by implementing a system that processes both a service fee and the investing money deposited to a virtual account, remitting the investing money to user's KIS account immediately. (Spring Boot, ibatis, mysql) Automate QA preview for the generated advisory porfolio report: ● Implement an algorithom to create QA report based on policies that an advisory board uses to validate multiple ETF portfolios at once in a dashboard. ● Reduce Advisory Board member's validation time for a created portfolio by providing QA validation report, decreasing the time for an advisory board to validate the generated advisory ETF portfolio approximately 2 hours to 20 mins (django, javascript, html, css) Show less

  • 핏펫(Fitpet)
    • South Korea
    • Manufacturing
    • 1 - 100 Employee
    • Backend Engineer
      • Jan 2021 - Oct 2021

      New service `Hospital Reservation` development(2021. 07 ~ present) ● Lead a backend team of 3 members ● Develop user-side APIs & hospital-side APIs for the reservation service Move Fitpet `Ahead` service API MSA -> Monolithic architecture (2021. 05~2021.06) ● Move MSA APIs to monolithic repo and architecture ● Convert CPP based Ahead Urine Inspection service into python based codes ● Develop new APIs for Ahead Dental Inspection service Move Fitpet `Find hospital` service API MSA -> Monolithic architecture (2021. 01~2021.04) ● Optimize hospital searching ORM query ● Adopt poetry(new package manager) for the better dependency management (Django, poetry(package manager), docker-compose, celery, CI/CD(github action, ECS, Fargate), AWS Elastic Cache, RDS, terraform) Show less

  • AITRICS
    • Information Technology & Services
    • 1 - 100 Employee
    • Software Engineer
      • Jan 2020 - Jan 2021

      - Develop and maintain HealthCare system(Vitalcare) Develop and implement and API server that deliver patients' diagnosis, vital-signs, etc. to AI's inference model.(Django, celery, redis stream, mysqldb) Develop and implement an inference server which contains AI model that predicts the patient's sepsis and risk possibility.(Bottle) Maintain and optimize the system's on-premise infra using docker and docker swarm - Develop and maintain HealthCare system(Vitalcare) Develop and implement and API server that deliver patients' diagnosis, vital-signs, etc. to AI's inference model.(Django, celery, redis stream, mysqldb) Develop and implement an inference server which contains AI model that predicts the patient's sepsis and risk possibility.(Bottle) Maintain and optimize the system's on-premise infra using docker and docker swarm

  • 굿닥 (Goodoc)
    • South Korea
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • Server Developer
      • Aug 2019 - Dec 2019

      - Develop a scheduler system Develop a backend system that deliver all email, sms, and push notifications to the users of Goodoc application in accordance with schedules System is designed to be utilized to send messages to all users for all different services provided by the company. (Flask, Celery, RabbitMQ, AWS RDS, Elastic Cache, Jenkins) - Develop a scheduler system Develop a backend system that deliver all email, sms, and push notifications to the users of Goodoc application in accordance with schedules System is designed to be utilized to send messages to all users for all different services provided by the company. (Flask, Celery, RabbitMQ, AWS RDS, Elastic Cache, Jenkins)

  • QARA
    • South Korea
    • Financial Services
    • 1 - 100 Employee
    • Sr. Software Engineer
      • Oct 2017 - Jun 2019

      - Develop Financial AI search engine site, https://www.whatisfund.ai (beta version) Develop back-end APIs using Apache, HA proxy, Flask-restplus(python), sqlalchemy, redis, mongodb Develop multiprocessing logic for core search engine Develop front-end using Vuejs - Develop Global AI robo-advisor hybrid app, KOSHO Develop the base architecture and implement REST-API server with Flask(python) on Aws. Develop the front-end of the hybrid app with Vuejs, Swift, and Java for iOS and Android. Develop an automated i18n application tool integrating Google spreadsheet to manage translations for KOSHO - Develop a custom skill called KOSHO for both Clova(NAVER) and Alexa(AMAZON) Lead the development of the service Use oauth2 framework to implement the account linking for the service(using Redis) Implement flask based API service to provide data to each ai speaker service - Develop serverless API service to provide data to a partnered company Use AWS's Cloudfront, API gateway, VPC, LAMBDA, mongoDB and ZAPPA(a third party library to configure API gateway and LAMBDA at once) Cover the API requests come from an app with 100000 DAU Reduce the cost for the server maintenance more than 10 times(comparing to the use of m4.large) Reduce the work expense to manage the traffic caused by 100000 DAU by using LAMBDA(which provides auto-scaling itself) Show less

  • ZEROWEB
    • South Korea
    • Information Technology & Services
    • 1 - 100 Employee
    • Software Engineer
      • Apr 2016 - Oct 2017

      - Maintain and develop the bulking system, automating the processes of the system, reducing the time consumption of its processes up to 95% of the previous time consumption. (Shell Script and python) - Implements PHP RESTful API and Front-End of Web Application that analyzes big-data gathered by sensors and provides charts and recommendations to its users for their business success. (PHP, AngularJS, Bootstrap, D3.js) - Developing Hybrid Mobile App with Ionic framework, helping sales teams and co-workers manage and enhance their tasks and products with its functions enhanced by Cordova Plugins. (JAVASCRIPT, HTML) - Develop Python-Flask REST API Use AWS to make a python-REST API server managing data flow to ZEROWEB app appilication and other infra management system. (Server: AWS, EC2, LAMBDA, S3, u UWSGI) (REST-API: PYTHON, FLASK, SQLALCHEMY) - Develop Infra-System Front-End Use react to develop the front end of our resource management system, visualizing the process of company's plan and business and tracking activity and achievement of employees. (React, Google Chart, Google Map) -Develop a Working-Tool Develop a unique tool for ZEROWEB and its employees to handle daily tasks. Implements the app from Front-End to Back-End (React_Native, Flask, Sqlalchemy, Python) Show less

  • Republic of Korea Army
    • Armed Forces
    • 400 - 500 Employee
    • SW Development Soldier
      • Aug 2014 - Apr 2016

      Developing Army's intranet websites and maintaining the existing websites. -Mainly fix and change the existing PHP websites into MVC model 2 based JSP websites(JAVA, Jquery, SQL) Participating in developing Bigdata analysis tools - Mainly research and study for the necessary techs such as Hadoop, Spark, HBase. Translating and Interpreting English professional dissertations and documents into Korean for the support of development projects Developing Army's intranet websites and maintaining the existing websites. -Mainly fix and change the existing PHP websites into MVC model 2 based JSP websites(JAVA, Jquery, SQL) Participating in developing Bigdata analysis tools - Mainly research and study for the necessary techs such as Hadoop, Spark, HBase. Translating and Interpreting English professional dissertations and documents into Korean for the support of development projects

  • Wrevel, Inc.
    • United States
    • Technology, Information and Internet
    • 1 - 100 Employee
    • Web Application Developer(Intern)
      • Jul 2013 - Dec 2013

      Using Jquery, JS, php, and sql, develop and improve the previously developed web application. - Participate on the development of its blog and search page Develop UI/UX of its main page and blog page (PHP, JQUERY, JS, CSS) Develop search function on the website by making functions and procedures on its database management system using SQL Using Jquery, JS, php, and sql, develop and improve the previously developed web application. - Participate on the development of its blog and search page Develop UI/UX of its main page and blog page (PHP, JQUERY, JS, CSS) Develop search function on the website by making functions and procedures on its database management system using SQL

Education

  • Stony Brook University
    Bachelor's degree, Computer Science
    2009 - 2013

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