Jongwook Kim, Software Developer in Seattle, WA, United States
Jongwook Kim

Software Developer in Seattle, WA, United States

Member since December 17, 2015
With over a dozen years of experience, Jongwook develops simple and robust software that delivers value to customers. Jongwook believes that showing the client a working software first and evolving that product together is important to the development process, so he welcomes changing requirements. He enjoys problem solving and communicating with motivated individuals.
Jongwook is now available for hire




Seattle, WA, United States



Preferred Environment

Spark, Git, Linux, Python, PHP

The most amazing...

...project I’ve worked on involved gathering user feedback and modeling a rank algorithm for a social search collection.


  • Software Engineer

    2016 - PRESENT
    • Worked as a solutions engineer for Facebook in Korea. Consulted Korean advertisers to adopt and utilize Facebook marketing solutions such as Dynamic Ads, Pixel, and App Events in order to achieve business objectives.
    • Designed and implemented a new plugin API that helps engineers extract strings to be translated for the purpose of i18n from various sources such as code repositories, database, and files.
    Technologies: React, PHP
  • Team Lead

    2008 - 2015
    • Implemented a blog post ranking algorithm using bloggers’ trusts, which was computed by their recommendation histories.
    • Created a personalized blog post feeder on Lucene.
    • Modeled news and image collection ranking algorithms.
    • Led a team to create a buzz search service from scratch, which gathers and evaluates users’ reactions to finding issues and related content.
    • Led a team that focused on developing search keyword services, including auto-completion, query suggestions, and trends.
    Technologies: Java, Python, Scala, Spark
  • Software Engineer

    2006 - 2008
    • Adopted Agile methodologies to decrease bugs and service failures.
    • Integrated Java frameworks such as Spring, iBatis, and FreeMarker.
    • Automated server managing and service deployment using Bash.
    • Implemented network servers for communicating with game servers and backed up authentication Oracle servers by using a memory database instead.
    • Worked as the technical lead for Hangame's web development center.
    Technologies: MySQL, Spring, Java
  • Web Developer

    2002 - 2006
    SK Communications and Unitel
    • Implemented a common JavaScript library based on Prototype.js.
    • Developed websites using Struts and MySQL.
    • Maintained and improved websites for online photo prints, online movies, and P2P sites as a lead developer.
    • Implemented a back-end server with pooling sockets from clients and synced events with an external server.
    • Worked with the Cyworld development team.
    Technologies: JavaScript, Java


  • Task Management System

    This web app is a private project for task management that is based on Django, SQLite, and Vue.js. All functions are covered by unit tests and functional tests.

  • Online Parser

    This is a private project for parsing TSV files. The project uses web sockets for bidirectional data handling. The Tornado web server is used for the back-end web socket, and AngularJS is used for the front-end.

  • How to Create a Simple Python WebSocket Server Using Tornado (Publication)
    The threaded model and global interpreter lock has always been in the way of Python handling thousands of concurrent long-lived connections. Modern web frameworks, such as Tornado, use non-blocking network I/O to make Python feasible for implementing WebSocket servers. In this article, Toptal engineer Jongwook Kim walks us through the process of implementing a simple WebSocket-based web application in Python using the Tornado web framework.


  • Languages

    Hack, SQL, Python, Java, Scala, JavaScript, PHP, CSS
  • Storage

    MySQL, Redis
  • Frameworks

    Apache Spark, Hadoop, Spring, Spark, Django
  • Libraries/APIs

    React, jQuery
  • Tools

  • Paradigms

    Data Science, Agile Software Development, Concurrent Programming
  • Other

    Machine Learning, Leadership, System Architecture
  • Platforms

    Amazon EC2, Linux


  • Bachelor's Degree in English Language and Literature
    1995 - 2002
    Yonsei University - Seoul

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