Marcin Cylke
Warsaw, Masovian Voivodeship, Poland
Summary
👤
Senior🎓
Top SchoolMarcin Cylke is a seasoned software engineer and team leader with 13 years of experience building high-performance backends, distributed systems, and machine learning-driven recommender platforms. Based in Warsaw, he has led research-oriented teams at Allegro to deliver retrieval and ranking models, and now focuses on making diverse LLMs accessible to internal users at Grammarly. His background spans Hadoop/Spark ecosystems, Scala-based cloud deployments, and adtech/statistics systems, complemented by early experience in system engineering and Java EE development. An active contributor to open-source—having refined the jcabi GitHub API wrapper—he brings practical testing and API-alignment sensibilities to integrations. Colleagues describe him as intellectually curious and fond of hacking on offbeat projects, which fuels his continual learning across new domains. He pairs strong hands-on implementation skills with leadership in knowledge-sharing and production-grade ML engineering.
14 years of coding experience
18 years of employment as a software developer
M. Sc., computer science, M. Sc., computer science at Warsaw University of Technology
English, German, Chinese, Spanish
Stackoverflow
2,100reputation
435kreached
35answers
44questions
Github Skills (14)
javas10
rest-api10
github-api10
java10
testing9
api9
oop9
datetime6
data-structures6
browser6
user-interface6
postgresql6
default-value6
autotools6
Programming languages (13)
Github contributions (5)
jcabi/jcabi-github
Dec 2014 - Apr 2015
Java Object-Oriented Wrapper of GitHub API, with a fake implementation of the entire GitHub API (for your tests)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 commits, 2 PRs, 21 comments in 4 months
Contributions summary:Marcin primarily worked on modifying and enhancing the GitHub API wrapper's functionality. Their commits focused on refining the URL structures used for accessing pull request comments and implementing the GitHub Status API. These changes included updating Java code to align with the GitHub API endpoints and adjusting test cases to validate the changes. The user also made minor fixes to ensure code correctness.
javaapisdkrest-apioop
zygm0nt/llm-paper-notes-mcl
Mar 2024 - Sep 2025
Contributions:183 pushes, 6 branches in 1 year 6 months
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