Ufuk Celebi
Director Of Engineering at Confluent
Berlin, Other
Summary
🤩
Rockstar🎓
Top SchoolUfuk Celebi is a Director of Engineering based in Berlin with 11 years of experience building and leading teams around distributed stream and real-time data systems. Currently at Confluent after senior engineering leadership at Materialize and as a long-time PMC member and committer for Apache Flink, he blends product-focused management with deep systems and backend engineering chops. He has hands-on contributions to high-profile open-source projects—improving SQL array semantics and TLS Postgres connectivity in Materialize and driving core Flink testability and dataflow enhancements. Comfortable spanning backend and front-end work (e.g., Flink website edits), he is equally at home refining operator semantics as tweaking UX. Colleagues describe him as a pragmatic technical leader who surfaces subtle correctness fixes that prevent production surprises. His background in academic research and early work on Stratosphere/Scalaris underpins a strong foundation in distributed systems theory and practice.
11 years of coding experience
12 years of employment as a software developer
Freie Universität BerlinTechnische Universität BerlinETH Zürich
English, German, Turkish
Stackoverflow
151reputation
11kreached
1answer
0questions
Github Skills (23)
postgresql10
apache-flink10
testing10
css10
java10
javas10
sql10
html10
rust10
concurrency10
data-structure9
admin9
database-administration9
databases9
performance-optimization9
Programming languages (8)
Github contributions (5)
apache/flink-web
May 2015 - Oct 2017
Apache Flink Website
Role in this project:
Front-end Developer
Front-end DeveloperContributions:1 review, 104 commits, 3 PRs in 2 years 6 months
Contributions summary:Ufuk primarily contributed to the website's front-end, focusing on layout and content modifications within HTML files. They made changes to the features page and blog index, updating the layout and content. Their work included modifications to various elements such as the navigation bar and the blog's article structure. The user demonstrates a familiarity with HTML and CSS, suggesting a front-end development focus.
flinkapachebig-datasparkapache-flink
apache/flink
Sep 2014 - Apr 2019
Apache Flink
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 reviews, 651 commits, 216 PRs in 4 years 7 months
Contributions summary:Ufuk's contributions primarily focused on modifying the Flink codebase to enhance testing, functionality, and performance. Their work included refactoring code, such as renaming variables and waiting for slots in the mini-cluster environment, as well as implementing improvements to handle data flow efficiently and to resolve potential race conditions. Moreover, the user added functionality for coGroup, which involved implementing collection-based execution for flatMap, coGroup, and fixed issues in other areas.
pythonflinkconnectorsqlapache
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