Maciej Mensfeld
Principal Product Architect at Karafka
Queensland, Poland
Summary
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Rockstar🎓
Top SchoolMaciej Mensfeld is a Principal Product Architect with 15 years of experience building developer tools and secure software supply chains, currently leading product and architecture initiatives at Mend. He founded the Karafka framework to simplify Ruby + Kafka integration and is the creator of Diffend (Mend Supply Chain Defender), reflecting deep practical expertise in streaming systems and OSS security. His open-source contributions to ruby-kafka and Karafka emphasize performance, reliability, and consumer-side robustness—work that underpins high-throughput production systems. A former VP of Engineering and startup founder, he combines hands-on backend engineering with product leadership and team-building across distributed teams. Based in Queensland with roots in Poland, he often operates at the intersection of security, developer experience, and large-scale Ruby architectures.
15 years of coding experience
13 years of employment as a software developer
Master's degree Computer science, Master's degree Computer science at Politechnika Krakowska im. Tadeusza KościuszkiComputer Science, Computer Science at Universidad de León
Polish, English
Stackoverflow
91reputation
1kreached
7answers
0questions
Github Skills (22)
back-end-development10
api-design10
rubygems10
testing10
kafka10
kafka-node10
message-queue10
ruby10
framework-design10
kafkajs10
code-optimization9
multithreading9
error-handling9
activerecord9
ruby-kafka6
Programming languages (19)
Github contributions (5)
karafka/karafka
Jul 2015 - Jan 2023
Ruby and Rails efficient Kafka processing framework
Role in this project:
Back-end Developer
Back-end DeveloperContributions:118 releases, 95 reviews, 1194 commits in 7 years 7 months
Contributions summary:Maciej made several commits related to the Karafka framework, a Ruby and Rails efficient Kafka processing framework. Their work included implementing features, addressing errors, and refining the API, indicating a back-end development focus. Contributions span different modules and improvements to the framework, including code optimization and the addition of a base class. The user also focused on the development of additional components, further demonstrating their involvement in the project's core.
active-jobapache-kafkarubyruby-and-railskafka-producer
zendesk/ruby-kafka
Aug 2017 - Dec 2022
A Ruby client library for Apache Kafka
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 10 PRs, 209 comments in 5 years 5 months
Contributions summary:Maciej contributed extensively to the core functionality of the `ruby-kafka` library. Their work involved implementing features for consumer groups, including offset management and heartbeat mechanisms. They focused on improving the consumer's capabilities, such as adding configurable options for fetcher queue size and refactoring the code for improved API compatibility. The user's changes reflect a focus on the library's performance, reliability, and overall consumer experience.
apache-kafkaruby-gemkafka-consumerclient-libraryruby-client
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