Niels Theen
Senior Software Developer at onOffice GmbH
Baesweiler, North Rhine-Westphalia, Germany
Summary
👤
Senior🎓
Top SchoolNiels Theen is a Senior Software Developer and tech lead with 11 years of experience building and maintaining PHP- and JavaScript-driven web backends, currently shaping engineering standards and mentorship at onOffice GmbH. He blends hands-on development — including Elasticsearch integrations, MariaDB work, and large-scale refactoring — with a focus on code quality, test automation and developer coaching. As an active open-source contributor he improved the ReactPHP HTTP library’s test suite and added a Chunked Decoder, demonstrating a practical knack for low-level protocol correctness. Organizer of Web Engineering Aachen meetups, he cultivates community learning and cross-team knowledge sharing beyond his day job. Based in Baesweiler, Germany, he balances engineering rigor with continuous self-improvement and even publishes small projects like bragdoc.me, signaling a practical builder’s mindset.
11 years of coding experience
8 years of employment as a software developer
Bachelor of Science - BS Informatik, Bachelor of Science - BS Informatik at Aachen University of Applied Sciences - FH AachenAusbildung Fachinformatik Anwendungsentwicklung, Ausbildung Fachinformatik Anwendungsentwicklung at Datus AG
Stackoverflow
46reputation
1kreached
3answers
1question
Github Skills (23)
unit-testing10
back-end-development10
testing10
http10
lms10
http-client10
php10
ilias10
test-automation10
git9
http-server9
mysql7
database-api7
databases7
database7
Programming languages (6)
Github contributions (5)
reactphp/http
Feb 2017 - Apr 2017
Event-driven, streaming HTTP client and server implementation for ReactPHP.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:43 commits, 28 PRs, 105 comments in 2 months
Contributions summary:Niels primarily focused on improving the test suite for the ReactPHP HTTP library. Their contributions include removing unnecessary interfaces and type hints, fixing assertions within the test suite, and refactoring tests to use mock objects and stub implementations. They also added and tested a Chunked Decoder class for handling chunked transfer encoding in HTTP requests.
streaming-requesthttp-clientphpstreamingstreaming-response
onOfficeGmbH/api-client-gui
Feb 2021 - Feb 2023
Contributions:1 release, 2 PRs, 1 push in 1 year 11 months
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