Andrzej Klajnert
Senior Software Engineer at Akamai Technologies
Jaworzno, Silesian Voivodeship, Poland
Summary
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Rockstar🎓
Top SchoolAndrzej Klajnert is a Senior Software Engineer with seven years of professional experience, currently contributing to Akamai from Jaworzno, Poland. He progressed from embedded and support roles into lead and senior engineering positions at Cadence, demonstrating strong system-level and backend expertise. Andrzej is an active open-source contributor—his work on pytest improved fixture scoping and dynamic behavior, and he modernized a popular Spotify downloader by refactoring to asyncio and hardening CI with tests and mypy checks. He combines practical UNIX/system administration experience with test automation and asynchronous backend development, favoring maintainable, well-tested solutions. Colleagues know him for turning tricky concurrency and testing edge-cases into robust features and for improving developer workflows through thoughtful automation.
7 years of coding experience
6 years of employment as a software developer
Inżynier (Inż.) Informatyka, Inżynier (Inż.) Informatyka at Polish-Japanese Academy of Information Technologytechnik informatyk, technik informatyk at Zespół Szkół nr 1 w Piekarach Śląskich
Polish, English
Stackoverflow
348reputation
23kreached
2answers
2questions
Github Skills (15)
test-automation10
unit-testing10
spotify10
pytest10
ffmpeg10
python10
unit-test10
asyncio10
testing10
automation9
automations9
asynchronous6
selenium6
web-crawler6
python-asyncio6
Programming languages (8)
Github contributions (5)
spotDL/spotify-downloader
Dec 2020 - Mar 2021
Download your Spotify playlists and songs along with album art and metadata (from YouTube if a match is found).
Role in this project:
Back-end Developer & Automation Engineer
Back-end Developer & Automation EngineerContributions:143 reviews, 11 commits, 16 PRs in 3 months
Contributions summary:Andrzej primarily refactored the project's download functionality, switching from multiprocessing to asyncio for asynchronous operations, which likely improved performance and resource utilization. They added comprehensive tests for the downloader, demonstrating a focus on code quality and maintainability. Furthermore, the user addressed CI/CD by making mypy checks, installing ffmpeg for testing, and fixing regressions, indicating involvement in build and testing automation.
spotifyyoutubemp3download-musicmusic
pytest-dev/pytest
May 2019 - Dec 2022
The pytest framework makes it easy to write small tests, yet scales to support complex functional testing
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:10 reviews, 6 PRs, 86 comments in 3 years 7 months
Contributions summary:Andrzej contributed to the pytest framework by fixing scope behaviors with indirect fixtures and implementing the dynamic scope feature, enhancing the framework's flexibility and functionality. They also made minor cleanup changes in tests and addressed fixture function signature issues, ensuring the code's robustness and maintainability. Furthermore, they added and corrected test cases demonstrating the dynamic scope and argument handling of pytest fixtures.
functional-testingpytestunit-testingtestingpython
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