Sebastian Helzle
Selbstständiger at Sebastian Helzle IT-Beratung
Rheinstetten, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolSebastian Helzle is a seasoned full-stack developer and independent IT consultant with 15+ years delivering web applications, product coaching, and Scrum leadership from Rheinstetten, Germany. He specializes in Neos CMS and Flow Framework development, building React/PHP modules, improving SEO, image optimization and integrations, and regularly contributes to Neos core and UI repositories. Equally comfortable on frontend and backend, he has enhanced CKEditor5 for namespaced SVG elements, optimized Flow cache backends (Redis/PDO), and created living styleguides with HTML5 and JavaScript. As a former Scrum Master and Product Owner he combines hands-on engineering with customer-facing discovery to turn requirements into practical solutions. He also publishes open-source work for the community and automates workflows with Python—offering both consultancy and reusable modules. Off-duty he’s as likely to be found baking as committing to a Neos pull request.
15 years of coding experience
6 years of employment as a software developer
Diplom Informatik, Diplom Informatik at Karlsruhe Institute of Technology (KIT)
English, German
Stackoverflow
36reputation
225reached
4answers
0questions
Github Skills (26)
caching10
content-management-system10
javascript10
redis10
flowframework10
css10
ui-design10
ckeditor10
fusion10
uid10
dom-manipulation10
php10
wysiwyg10
front-end-development10
content-management10
Programming languages (10)
Github contributions (5)
neos/neos-development-collection
Oct 2013 - Jan 2023
The unified repository containing the Neos core packages, used for Neos development.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:242 reviews, 278 commits, 199 PRs in 9 years 5 months
Contributions summary:Sebastian contributed to documentation, integrated new features into existing Eel query cookbooks, and improved the UI by switching to a wireframe mode with better readability using CSS styles. Additionally, the user implemented and tested features related to FlowQuery operations and refactored the code to optimize and add the feature for backend module menu. The user also created and updated backend UI elements such as menus.
core-packagecontent-managementflowframework
neos/flow-development-collection
Oct 2014 - Oct 2022
The unified repository containing the Flow core packages, used for Flow development.
Role in this project:Back-end Developer
Back-end DeveloperContributions:31 reviews, 35 commits, 27 PRs in 8 years 2 months
Contributions summary:Sebastian primarily contributed to bug fixes within the Neos Flow framework, focusing on core caching and routing functionalities. They addressed issues related to cache backends, including the PDO, Redis, and file-based implementations, resolving problems with data retrieval and iteration. The user also implemented the `flushByTags` feature across multiple cache backends, and optimized the Redis cache backend to increase performance. Furthermore, they addressed issues related to the handling of HTTP headers.
core-packagephp-frameworkflowframeworkopinionated-framework
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