Qingsheng Ren - Staff Software Engineer at The Apache Software Foundation

Qingsheng Ren

Staff Software Engineer at The Apache Software Foundation

Munich, Bavaria, Germany

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Summary

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Rockstar

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Top School

Qingsheng Ren is a Staff Software Engineer and open-source leader based in Munich with a decade of experience building and hardening distributed stream-processing systems. A long-time Apache Flink committer and PMC member, he has driven stability and feature work across Flink and Flink CDC—most notably improving Kafka integration, FLIP-27 KafkaSource implementation, and MySQL heartbeat reliability in Debezium-based CDC connectors. At Ververica and previously at Alibaba, he combined hands-on connector and engine development with release management and connector commercialization, often tackling subtle race conditions and testing gaps that impact production reliability. Trained at Zhejiang University and Carnegie Mellon, he pairs rigorous systems engineering with an appetite for challenging designs and cross-team collaboration, and is increasingly exploring AI-model and data-ingestion intersections within stream engines.

10 years of coding experience

6 years of employment as a software developer

Electrical and Computer Engineering, Electrical and Computer Engineering at University of California, Davis

Master of Science - MS, Electrical and Computer Engineering, Master of Science - MS, Electrical and Computer Engineering at Carnegie Mellon University

Bachelor's degree, Electrical Engineering and Automation, Bachelor's degree, Electrical Engineering and Automation at Zhejiang University

English, Chinese, German

Github Skills (17)

apache-flink10

mysql10

testing10

debezium10

kafka10

flink-sql10

java10

javas10

data-streaming10

change-data-capture10

reporting-tools9

serialization9

data-serialization9

meter9

embedded-reporting9

Programming languages (3)

JavaShellHTML

Github contributions (5)

apache/flink-cdc

Mar 2022 - Nov 2022

Flink CDC is a streaming data integration tool

Role in this project:

Back-end Developer

Contributions:1 release, 177 reviews, 20 commits in 8 months

Contributions summary:Qingsheng primarily contributed to improving the MySQL heartbeat feature within the Flink CDC project, focusing on enhancing testing procedures and addressing related issues. They implemented a new test case to validate the heartbeat functionality and made code modifications to the `BinlogSplitReaderTest.java` file. Furthermore, the user addressed a bug in the chunk splitter thread. The user's work centered on the MySQL connector, integrating with Debezium, and enhancing the system's reliability.

flinkchange-data-captureapachebig-dataspark

apache/flink

Feb 2020 - Nov 2022

Apache Flink

Role in this project:

Back-end Developer

Contributions:227 reviews, 138 commits, 173 PRs in 2 years 8 months

Contributions summary:Qingsheng primarily contributed to the Kafka connector for Apache Flink. Their work involved removing legacy Kafka connector properties, fixing a bug related to deserialization schema opening during state recovery, and improving the reporting of Kafka consumer metrics and offsets in the Flink metric group. They also refactored partition discovery logic and implemented the new FLIP-27 KafkaSource within the table connector, demonstrating a focus on the stability and performance of Kafka integration within Flink. Furthermore, the user improved the test environment and fixed a potential race condition during offset commit.

pythonflinkconnectorsqlapache

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