Marcus Klein
VP Release Management at Open-Xchange
Olpe, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolMarcus Klein is a seasoned engineering leader with 20 years' experience driving release management and CI/CD for the Open-Xchange App Suite, where he currently serves as VP Release Management. He combines deep hands-on expertise across cloud and infrastructure technologies—OpenStack, Kubernetes, Ceph, KVM, PowerDNS—and a JVM/Python toolchain with practical automation using GitLab, Jenkins, Ansible and Chef. Marcus progressed from developer to team lead and now oversees software release processes and quality metrics, improving test coverage and delivery pipelines. An active contributor to embedded IoT tooling, he has optimized the homie-esp8266 framework with SSL and firmware-size improvements, showing a willingness to dive into low-level constraints as well as large-scale platform concerns. Based in Olpe, Germany, he pairs systems-level curiosity with pragmatic delivery focus, often bridging legacy redesigns and modern cloud-native practices.
20 years of coding experience
11 years of employment as a software developer
Diploma, Computer Science, Diploma, Computer Science at University of Siegen
German, English
Github Skills (13)
application-framework10
app-framework10
iot10
mqtt10
web-framework10
c-language10
cprogramming-language10
arduino10
mqttnet10
esp826610
home-automation9
ssl8
mdns8
Programming languages (18)
Github contributions (5)
homieiot/homie-esp8266
Mar 2019 - Dec 2020
💡 ESP8266 framework for Homie, a lightweight MQTT convention for the IoT
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:6 reviews, 12 commits, 21 PRs in 1 year 9 months
Contributions summary:Marcus's contributions primarily focus on enhancements and modifications to the Homie-ESP8266 framework, specifically for IoT devices. They've added compile flags to disable configuration and mDNS, optimizing the firmware size. Further contributions include SSL support for MQTT connections and fixing a reorder warning. The user also addressed WiFi DNS parsing and made code adjustments related to boot modes and device ID generation.
esp8266iotmqtthomiearduino
kleini/bricklink
Jan 2014 - Jun 2021
Tools for extracting data from BrickLink
Contributions:381 commits, 72 PRs, 335 pushes in 7 years 6 months
bricklinkpythonextracting-data
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