Dennis Kaarsemaker
Staff Software Engineer at GitHub
Flevoland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolDennis Kaarsemaker is a Staff Software Engineer with 17 years of experience building and operating large, heterogeneous web and infrastructure environments, currently at GitHub. He combines deep Unix/Linux and MySQL administration expertise with hands-on C and Python development to deliver highly available, scalable systems and fast turnarounds in small, focused teams. At GitHub he progressed from Site Reliability Engineering to staff-level engineering, reflecting a strong blend of operational rigor and architectural leadership. Dennis is an active open-source contributor, improving core tooling like Git and Fluent Bit and adding LDAP and auth backends to projects such as Bitlbee, showing attention to both security and interoperability. He excels at automation, distribution packaging and problem analysis, often tackling thorny parsing and integration issues that others avoid. Based in Flevoland, Netherlands, he enjoys technical challenges and thriving in environments where impact is measured by resilience and efficiency rather than headcount.
17 years of coding experience
13 years of employment as a software developer
VWO, VWO at Tabor CollegeBSc., Computer Science, BSc., Computer Science at University of Amsterdam
Dutch, English, German, French
Stackoverflow
286reputation
16kreached
4answers
1question
Github Skills (33)
git10
parser10
python10
user-authentication10
authentication10
c1110
c1710
parsing10
rest10
github-api10
parse10
fluent-bit10
rest-api10
logging10
shell10
Programming languages (12)
Github contributions (5)
sigmavirus24/github3.py
Oct 2012 - May 2016
Hi, I'm a library for interacting with GItHub's REST API in a convenient and ergonomic way. I work on Python 3.6+.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:44 commits, 4 PRs, 2 pushes in 3 years 8 months
Contributions summary:Dennis focused on enhancing the `github3.py` library by implementing new functionalities and refining existing ones to interact with the GitHub API. Their contributions include fixing pull request URLs, refactoring code for improved maintainability, and adding iterator functions for various API calls, particularly for methods that don't require parameters. They also addressed bugs and improved the library's robustness by handling edge cases and improving error messages for authorization methods.
apipythonpython-3-6python38rest-client
fluent/fluent-bit
May 2021 - Oct 2022
Fast and Lightweight Logs and Metrics processor for Linux, BSD, OSX and Windows
Role in this project:Back-end Developer
Back-end DeveloperContributions:2 reviews, 6 commits, 7 PRs in 1 year 5 months
Contributions summary:Dennis primarily contributed to the `fluent-bit` project by implementing and enhancing parsing functionalities, particularly for the `logfmt` format. They addressed issues related to incorrect parsing of bare keys and omissions of values, ensuring accurate data handling. The user also added metrics for processing volume in filters, adding features to modify filters, and optionally rejected messages with incomplete logfmt data. These changes suggest a focus on improving data processing and parsing capabilities within the logging pipeline.
data-collectorpromqlloggingprometheuscloudnative
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