Leon Handreke - Data Platform Engineer

Leon Handreke

Data Platform Engineer

Berlin, Germany

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Summary

👤

Senior

🎓

Top School

Leon Handreke is a Data Platform Engineer with 16 years of software engineering experience, currently shaping data infrastructure at OpenSanctions from Berlin while studying sociology at Humboldt-Universität. He brings deep backend and mobile experience from roles at Google and long-term open-source contributions to the Matrix project, notably improving push notification gateways (sygnal) and Android SDK image uploads and GCM support. Comfortable across systems and client code, he combines reliability-focused engineering with a pragmatic approach to integrations and dependency management. His background in computer science from KIT and sociological studies gives him an uncommon blend of technical rigor and human-centered perspective on data problems.

16 years of coding experience

3 years of employment as a software developer

Bachelor of Science - BS, Computer Science, 2.1, Bachelor of Science - BS, Computer Science, 2.1 at Karlsruhe Institute of Technology (KIT)

Bachelor of Arts - BA, Sociology, 1.3, Bachelor of Arts - BA, Sociology, 1.3 at Humboldt-Universität zu Berlin

Github Skills (16)

javas10

notification10

api10

mobile-development10

image-upload10

android-sdk10

python10

apidoc10

java10

matrix9

sqllite9

sqlite-database9

sqlite9

gevent8

flask-ask7

Programming languages (13)

JavaC++CGoPerlHTMLKotlinTypeScript

Github contributions (5)

matrix-org/sygnal

Feb 2015 - Apr 2015

Sygnal: reference Push Gateway for Matrix

Role in this project:

Backend Developer

Contributions:8 commits, 2 PRs in 2 months

Contributions summary:Leon primarily contributed to the backend functionality of the sygnal project, focusing on implementing and modifying push notification features. Their work involved making the configuration parser case-sensitive, adding support for Google Cloud Messaging (GCM) push notifications, and integrating the GCM client. The user also addressed dependencies and removed unnecessary libraries.

push-gatewaypythonpushgatewaymatrix

matrix-org/matrix-android-sdk

Feb 2015 - Mar 2015

The Matrix SDK for Android

Role in this project:

Mobile Developer (Android)

Contributions:14 commits, 10 PRs, 4 comments in 1 month

Contributions summary:Leon primarily focused on improving the image upload and notification functionalities within the Android SDK. They fixed image upload issues related to the G+ Photos app by utilizing content streams and MIME types. They refactored code by moving resource-opening operations and correctly set the content length during uploads. Additionally, they added support for GCM message reception and implemented notification display logic, including actionable notifications.

the-matrixandroidsdkkotlinmatrix-sdk

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