John Roesler
Principal Software Engineer at Confluent
Austin, Texas Metropolitan Area United States
Summary
🤩
Rockstar🎓
Top SchoolJohn Roesler is a Principal Software Engineer with 11 years of professional experience, currently driving backend and streaming systems work at Confluent from Austin. He combines deep distributed-systems expertise—demonstrated by sustained contributions to Apache Kafka, Kafka Streams, and KSQLDB—with a strong testing and reliability mindset, improving long-running query behavior and system test coverage. Prior roles at Bazaarvoice saw him advance from intern to Senior Staff Engineer, reflecting both hands-on coding and technical leadership. John’s background in technical communication and editorial roles gives him an unusual aptitude for clear, user-focused documentation; he has directly improved Apache Kafka site docs and release notes. Comfortable spanning core engine work and developer-facing examples, he’s proven at making complex streaming primitives both robust and accessible.
11 years of coding experience
10 years of employment as a software developer
B.S. Computer Science, B.S. Computer Science at The University of Texas at AustinM.A Technical Communication, M.A Technical Communication at Texas State University
Github Skills (15)
testing10
java10
javas10
stream-processing10
kafka10
kafka-streams10
documentation10
test-automation10
scala10
dockers9
ksqldb9
docker9
avro8
buildr8
continuous-integration8
Programming languages (10)
Github contributions (5)
apache/kafka
Mar 2018 - Sep 2022
Apache Kafka - A distributed event streaming platform
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:566 reviews, 348 commits, 556 PRs in 4 years 7 months
Contributions summary:John's contributions focused on enhancing the functionality and reliability of the Apache Kafka Streams project. They implemented fixes and updates to system tests to get them working via Docker, addressing issues related to Streams system tests. The user also added test scenarios and improved the coverage for the codebase with new KTable mapValues and filter tests. Furthermore, they are working on improving the reliability of Kafka Streams tests and fixing potential issues during the test with the producer.
apache-kafkascalakafkajavastreaming
apache/kafka-site
Jan 2019 - Aug 2020
Mirror of Apache Kafka site
Role in this project:Technical Writer
Technical WriterContributions:10 reviews, 7 commits, 20 PRs in 1 year 7 months
Contributions summary:John's contributions primarily focused on updating and maintaining documentation for the Apache Kafka site. They added release notes for version 2.5.1, updated committer profiles, and added documentation related to configuration for managing topics. The user also made changes to the Scala DSL documentation, addressing dependency issues and providing usage examples. This work directly supports the project's documentation and user guidance.
apache-kafkascalakafka
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