József Bartók
Senior Software Engineer - External Contractor at Gradle Inc.
Sfântu Gheorghe, Romania
Summary
🤩
Rockstar🎓
Top SchoolJózsef Bartók is a senior software engineer with 7+ years as a contractor and over two decades working on real-time, high-performance Java systems, specializing in ultra-low-latency stream processing, garbage-free coding, and lock-free algorithms. He has led market-data and trading system initiatives that demonstrated sub-50µs end-to-end performance and contributed to renowned open-source projects like Hazelcast and Gradle (notably enhancing counter semantics and Kotlin DSL parsing). Comfortable designing DSLs, build tooling, and developer productivity features, he blends deep OOP and algorithmic expertise with practical parallelism and JVM performance engineering. Based in Sfântu Gheorghe, Romania, he brings both hands-on implementation skills and developer-facing improvements, often surfacing subtle correctness and performance gains across distributed systems.
7 years of coding experience
15 years of employment as a software developer
High School Diploma, Mathematics, High School Diploma, Mathematics at Székely Mikó Kollégium, SepsiszentgyörgyBachelor of Science (BS), Computer Science, Bachelor of Science (BS), Computer Science at Universitatea Tehnică din Cluj-Napoca
English, Japanese, German, Romanian, Hungarian
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (14)
kotlin10
javas10
distributed-systems10
parser10
parsing10
parse10
java10
in-memory9
concurrency9
testing9
distributed-computing9
caching8
data-structures8
data-structure8
Programming languages (9)
Github contributions (5)
hazelcast/hazelcast
Oct 2019 - Jul 2021
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:34 reviews, 83 commits, 31 PRs in 1 year 8 months
Contributions summary:József contributed to the `hazelcast/hazelcast` repository by implementing a `set` method for the `Counter` interface across multiple counter implementations (`SwCounter`, `MwCounter`). They added a `set` method to the `Counter` interface to allow for the setting of the current value of the counter. Furthermore, they incorporated tests for the `set` method across different counter implementations to ensure correctness, and modified the code related to `Counter` and its implementations.
computationstream-processingbigtablereal-timestreaming-data
gradle/gradle
Jul 2021 - Jan 2023
Adaptable, fast automation for all
Role in this project:Back-end Developer
Back-end DeveloperContributions:6 releases, 451 reviews, 508 commits in 1 year 6 months
Contributions summary:József appears to be a back-end developer, contributing code to the grammar transformation of the Kotlin DSL. Their work involves parsing and processing language syntax by implementing a grammar-to-light tree, incorporating changes to handle imports, and supporting binary expressions and function calls. Their focus is on completing parsing functionality within the Kotlin DSL framework.
pythongradlegroovyautomationjava
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