Jungtaek Lim
Senior Software Engineer at The Apache Software Foundation
Kwach'on, Gyeonggi, South Korea
Summary
🤩
Rockstar🎓
Top School
Top expert inDistributed Data Systems and Analytics Technology
Jungtaek Lim is a Senior Software Engineer with over 15 years of experience specializing in streaming frameworks and search services, currently at Databricks and an active committer in Apache Spark and Storm. He designs and builds large, centrally operable distributed systems that scale to handle massive data volumes, with a strong focus on stream processing and operational simplicity. A prolific open-source collaborator, he has contributed substantial back-end work to high-profile projects like Apache Spark, Delta Lake, Zeppelin, Iceberg and Jedis, including REST API enhancements and storage/streaming reliability fixes. His background spans production systems at major Korean platforms (Daum/Kakao) where he engineered high-throughput crawlers, real-time collectors and integrity checkers processing millions of items per hour. Known for practical engineering trade-offs, he blends deep systems knowledge with hands-on performance tuning and test automation. He also quietly steers community improvements—addressing subtle integration issues across Spark 4.0 and HDFS storage components that many teams rely on.
13 years of coding experience
14 years of employment as a software developer
BS, Computer Science, BS, Computer Science at Kookmin University
Stackoverflow
1,668reputation
99kreached
64answers
2questions
redis
top-5%
Github Skills (54)
api-rest10
apache-spark10
spark10
apache-storm10
data-pipelines10
delta-lake10
back-end-development10
redis10
api-design10
spark-structured-streaming10
restful-api10
testing10
jedi10
big-data10
kafka10
Programming languages (11)
Github contributions (5)
apache/storm
Jul 2014 - May 2019
Apache Storm
Role in this project:
Back-end Developer
Back-end DeveloperContributions:2422 commits, 325 PRs, 2 pushes in 4 years 11 months
Contributions summary:Jungtaek's commits focus on modifying and extending the `KafkaSpoutConfig.java` file within the `apache/storm` repository. These changes involve implementing new offset strategies (such as UNCOMMITTED_EARLIEST and UNCOMMITTED_LATEST), providing configuration options, and handling security settings like SSL keystore configurations. Additionally, the user has made changes to the `KafkaTridentSpoutEmitterTest.java` file for test improvements.
apache-stormstormapachedistributedstreaming
redis/jedis
Sep 2013 - Oct 2016
Redis Java client
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:405 commits, 160 PRs, 212 pushes in 3 years 1 month
Contributions summary:Jungtaek primarily focused on improving the functionality and robustness of the Jedis Java client, as evidenced by the code changes. They implemented multi-failover handling within JedisSentinelPool, adding new features and addressing previous issues. The user also focused on improving the performance of the test suite, added new testing functionalities, and fixed the script eval functions.
javaredisjedisredis-clientredis-cluster
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