László Kollár
Senior Software Engineer at Bloomberg
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolLászló Kollár is a senior software engineer based in London with 15+ years of experience building high-performance, distributed systems and OS-level tooling across finance and infrastructure. He has deep C/C++ and Python expertise, shipping production Cython extensions and large-scale deployment tooling for thousands of Python developers at Bloomberg. A pragmatic engineer with a founder’s mindset, he co-founded and sold a CI product for BI dashboards, blending product development with hands-on implementation. László is an active open-source contributor to widely used projects like pip and manylinux, improving package tooling, build automation and robust testing. He combines low-level optimisation and systems thinking with strong DevOps automation skills, and is currently not seeking new opportunities.
10 years of coding experience
18 years of employment as a software developer
BSc Information Technology, BSc Information Technology at Dunaújvárosi Főiskola
Github Skills (36)
docker10
pytest10
python10
scripting10
scroll-wheel10
testing10
packaging10
linux10
wheels10
dockers10
cicd10
script10
mousewheel10
build-automation10
sh10
Programming languages (9)
Github contributions (5)
pypa/auditwheel
May 2019 - Jul 2022
Auditing and relabeling cross-distribution Linux wheels.
Role in this project:
DevOps Engineer & Automation Engineer
DevOps Engineer & Automation EngineerContributions:3 releases, 44 reviews, 48 commits in 3 years 3 months
Contributions summary:László primarily focused on improving the project's build and testing infrastructure. They added a linter (flake8) to the test suite and corrected linting errors. They also implemented changes to the test environment, including pinning specific versions of dependencies and adding integration tests using Docker. Furthermore, the user improved the overall testing and build processes of the project.
relabelinglinux-distributionauditsecuritylinux
bloomberg/memray
Nov 2020 - Apr 2022
Memray is a memory profiler for Python
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 reviews, 135 commits, 2 PRs in 1 year 5 months
Contributions summary:László primarily focused on enhancing the memory profiling capabilities of the `bloomberg/memray` repository. Their contributions included the creation of a `RecordWriter` class for efficient and thread-safe saving of allocation records, along with implementations for stream and in-memory serializers. Furthermore, they implemented the socket-based reader and writer and made changes to include metadata such as command-line information and peak memory usage. These changes improve the project's core functionality related to memory analysis.
memorymemory-profilerpythonpython3memory-leak-detection
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