Oliver Hader
TYPO3 Security Team Lead at TYPO3 GmbH
Hof, Bavaria, Germany
Summary
🤩
Rockstar🎓
Top SchoolOliver Hader is a seasoned web software engineer and security leader with 19 years of experience, currently leading the TYPO3 Security Team and contributing to the TYPO3 CMS core. He combines deep hands-on backend development and static-analysis work—having enhanced taint analysis in the widely used Psalm tool—with practical security practice in PSIRT, forensics, and reverse engineering. As a long-time core team member, extension maintainer and technical writer, he blends code, documentation and architecture to improve developer experience and platform security. He also teaches and runs his own engineering consultancy, bringing an academic background in technical informatics and internet/web science to pragmatic open-source stewardship. An underappreciated strength is his track record of evolving legacy CMS internals toward more declarative, secure patterns while keeping real-world compatibility.
19 years of coding experience
10 years of employment as a software developer
Diplom-Informatiker (FH), Technische Informatik, Multimediale Systeme, A, Diplom-Informatiker (FH), Technische Informatik, Multimediale Systeme, A at Hochschule Hof, University of Applied Sciences
German, English, French
Stackoverflow
4,146reputation
361kreached
98answers
9questions
Github Skills (34)
type-inference10
static-analysis10
restructuredtext10
back-end-development10
taint10
rs10
php10
typo310
documentation10
mysql9
fluid9
security9
plugin-development9
databases9
extbase9
Programming languages (12)
Github contributions (5)
TYPO3/typo3
Jan 2007 - Jan 2023
The TYPO3 Core - Enterprise Content Management System. Synchronized mirror of https://review.typo3.org/q/project:Packages/TYPO3.CMS
Role in this project:
Back-end Developer
Back-end DeveloperContributions:3146 commits, 14 PRs, 1 push in 16 years 2 months
Contributions summary:Oliver primarily focused on addressing bugs and enhancing the functionality of the TYPO3 CMS core, with a focus on back-end improvements. Their work included fixing issues with workspace states and session management. Additionally, the user improved the flexibility of form engine by replacing direct JavaScript invocations with a more declarative approach. The contributions show the user's ability to contribute to the core codebase.
cmsmanagement-systemphpsynchronizedtypo3-cms
TYPO3-Documentation/TYPO3CMS-Reference-CoreApi
Sep 2016 - Nov 2020
"TYPO3 Explained": Main TYPO3 Core Document: Main classes, Security, TypoScript syntax, Extension API and much more
Role in this project:Technical Writer
Technical WriterContributions:4 reviews, 19 commits, 11 PRs in 4 years 2 months
Contributions summary:Oliver primarily contributed to the project by creating and modifying documentation files within the repository. Their work includes fixing typing errors, adding detailed scenarios for workspace persistence, and restructuring documentation using different markup elements (csv-table, definition lists). The user also updated the documentation to include suggestions on Content Security Policy (CSP) headers for resource storages and refactored existing content, improving the clarity and structure of the documentation.
apiexplainedsecuritytyposcripttypo3-cms-extension
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