Zdenek Tison
Staff Software Engineer at Confluent
Brno, South Moravia, Czechia
Summary
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Rockstar🎓
Top SchoolZdenek Tison is a Staff Software Engineer based in Brno with 10 years of experience building and operationalizing large-scale stream processing and NoSQL systems. He currently drives autoscaling and resource orchestration for Confluent’s serverless Flink SQL offering while contributing upstream to Apache Flink to ensure cloud-grade reliability. His background spans real-time identity and targeting platforms, distributed databases (TiDB, Kvrocks), and streaming ecosystems (Kafka, Pulsar, Flink), plus hands-on work on core-language and tooling projects like Rust stdlib and NQP. Known for pragmatic refactors, robust test improvements, and production-focused fixes (e.g., preventing livelocks in Curator), he combines deep systems knowledge with a DevOps mindset. Despite a self-deprecating GitHub bio, his contributions to prominent open-source projects show a habit of quietly improving performance, stability, and developer ergonomics.
10 years of coding experience
11 years of employment as a software developer
Master's degree, Information Technology, Master's degree, Information Technology at Vysoké učení technické v Brně, Fakulta informačních technologiíIng., Information Processing, Ing., Information Processing at High School of Electrotechnics, Frenštát pod Radhoštěm
Czech, English
Stackoverflow
5reputation
202reached
0answers
1question
Github Skills (93)
dependency-management10
postgresql10
website-development10
messaging10
testing10
databases10
bash10
text-formatting10
zookeeper10
refactor10
javas10
junit10
code-cleanup10
maven10
refactoring10
Programming languages (36)
Github contributions (5)
apache/pulsar
Oct 2020 - Jan 2023
Apache Pulsar - distributed pub-sub messaging system
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 release, 1054 reviews, 134 commits in 2 years 2 months
Contributions summary:Zdenek primarily contributed to code cleanup, dependency management, and refactoring efforts within the Apache Pulsar messaging system. They removed unused configuration files, redundant modules, and unnecessary dependencies like `jul-to-slf4j`, streamlining the codebase. Furthermore, the user addressed several build and test-related improvements, bumping Presto versions to ensure compatibility with newer Java versions, and implemented test improvements to improve the overall code quality. The user also resolved a few documentation issues.
event-streamingpulsarmessaging-systemstreamingapache
pingcap/tidb
Mar 2021 - May 2022
TiDB - the open-source, cloud-native, distributed SQL database designed for modern applications.
Role in this project:Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:927 reviews, 192 commits, 260 PRs in 1 year 2 months
Contributions summary:Zdenek's contributions focused on enhancing the TiDB open-source distributed SQL database, specifically related to features such as pushdown of distinct count operations, and optimizations within the query planner. They also worked on improving the performance and features of index operations. The code changes involve core database functionalities and interactions with underlying storage components, indicating a strong understanding of database internals.
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