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

Verified Expert  in Engineering

Software Developer

Seattle, WA, United States
Toptal 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.


React, PHP
Java, Python, Scala, Spark
MySQL, Spring, Java




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.

Work Experience

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

Noise Filter

A set of Spark codes that I wrote for Scala. The code filters noise logs by extracting features after GroupByKey and applies simple rules to classify noise users identified by a UUID key.

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.
1995 - 2002

Bachelor's Degree in English Language and Literature

Yonsei University - Seoul


React, jQuery




MySQL, Redis


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


Apache Spark, Hadoop, Spring, Spark, Django


Data Science, Agile Software Development, Concurrent Programming


Amazon EC2, Linux


Machine Learning, Leadership, System Architecture

Collaboration That Works

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