Cornel Kundt
Senior Software Engineer at Ardan Labs
Bordeaux, Nouvelle-Aquitaine, France
Summary
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RockstarCornel Kundt is a Senior Software Engineer based in Bordeaux with over two decades of professional engineering experience and a 12-year focused career in backend development. He is a passionate Golang specialist since 2014, repeatedly shipping high-performance, lock-free and concurrent data structures—evidenced by his own hashmap project and contributions to the widely used RoaringBitmap library. Cornel has worked across startups and consultancies (including multiple stints at Ardan Labs) and has driven production-grade compiler and runtime fixes in TinyGo, showing comfort at the intersection of systems, runtime, and library design. He combines pragmatic optimization—benchmark-driven improvements and clearer error handling—with a hands-on approach to serialization, GC and memory issues. Known for tackling low-level problems that materially improve reliability and throughput, he brings both deep technical craft and a track record of open-source impact.
12 years of coding experience
12 years of employment as a software developer
English, German, Spanish
Github Skills (25)
benchmark10
compiler-development10
testing10
benchmarking10
data-serialization10
data-structure10
hashmap10
serialization10
go10
hashtable10
data-structures10
lock-free10
concurrency10
llvm9
reflection9
Programming languages (6)
Github contributions (5)
cornelk/hashmap
Aug 2016 - Oct 2022
A Golang lock-free thread-safe HashMap optimized for fastest read access.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:7 releases, 145 commits, 38 PRs in 6 years 4 months
Contributions summary:Cornel primarily contributed to the development of a thread-safe, lock-free HashMap in Go. They implemented the core functionality of the HashMap, including creation, insertion, retrieval, deletion, and resizing operations. The user also added benchmark tests to compare the performance of the custom HashMap with the standard Go map, demonstrating a focus on optimization and performance analysis. Code changes indicate this user was responsible for implementing a specific data structure and optimizing its behavior.
golanglock-freelockfastestgo
RoaringBitmap/roaring
Jul 2016 - Dec 2018
Roaring bitmaps in Go (golang), used by InfluxDB, Bleve, DataDog
Role in this project:Back-end Developer
Back-end DeveloperContributions:14 commits, 3 PRs, 11 pushes in 2 years 4 months
Contributions summary:Cornel primarily contributed to the core functionality of the roaring bitmap library. Their work included implementing the `MarshalBinary` and `UnmarshalBinary` interfaces for serialization, allowing for encoding and decoding bitmaps using the `gob` package. Furthermore, the user addressed and improved error handling, specifically providing more meaningful panic messages within the container operations. The user also fixed typos and optimized code, demonstrating an understanding of the library's internal structure.
golangcreditsoftware-designelasticroaring-bitmaps
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