Radek Gruchalski
Managing Director Software Engineer at Klarrio GmbH
Aachen, North Rhine-Westphalia, Germany
Summary
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SeniorRadek Gruchalski is a managing director and software engineer with 14 years of experience building cloud-native, IoT and big-data systems from architecture to production. He leads Klarrio GmbH, helping enterprises bridge digital transformation and open-source practices while also consulting on complex migrations to Kafka, Kubernetes and cloud messaging. Hands-on with Scala, Java, Akka and MQTT, Radek has contributed to notable open-source projects such as MQTT.js and the Ruby fog library, improving security, reliability and IAM role support. He combines systems-level thinking with pragmatic engineering—designing resilient microservices, CI/CD and test-heavy migrations for regulated environments. Based in Aachen, Germany, he pairs technical delivery with team training on functional programming and actor models to accelerate scalable adoption. A practical problem solver, he thrives where ambiguous business needs must be turned into concrete, auditable software solutions.
14 years of coding experience
English, Polish, German
Github Skills (13)
testing10
mqtt10
mtls10
javascript10
nodejs10
tls1210
aws10
tls1310
mqttnet10
libtls10
ruby10
network-protocol9
excon8
Programming languages (21)
Github contributions (5)
mqttjs/MQTT.js
Jun 2012 - Dec 2012
The MQTT client for Node.js and the browser
Role in this project:
Back-end Developer
Back-end DeveloperContributions:18 commits, 2 comments in 5 months
Contributions summary:Radek primarily contributed to the core functionality of the MQTT client library. Their work involved bug fixes related to the handling of client connections and message acknowledgments, as well as the addition of TLS support, demonstrating an understanding of network protocols and secure communication. Furthermore, the user implemented features such as connection timeout handling, and memory leak fixes, indicating a focus on reliability and performance improvements. These changes demonstrate a solid understanding of the project's architecture and the underlying MQTT protocol.
browsernode-jsjavascriptmqttnodejs-library
fog/fog
May 2013 - Feb 2014
The Ruby cloud services library.
Role in this project:Backend Developer
Backend DeveloperContributions:21 commits in 8 months
Contributions summary:Radek primarily contributed to adding and modifying backend logic related to AWS Identity and Access Management (IAM), specifically focusing on roles. They implemented support for creating and managing IAM roles, including testing the functionalities. Additionally, the user integrated a copy image request with parser, mocks, and tests. Furthermore, the user refactored base classes and implemented global timeout modifications.
cloud-servicesrubygemstest-kitchenfogruby
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