Jelle Raaijmakers
Chief Operating Officer
Eindhoven, North Brabant, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJelle Raaijmakers is a seasoned technology leader and operator with 13 years of experience building infrastructure, developer tools, and product teams from startup to scale. As COO of the Ladybird Browser Initiative he combines hands-on systems and back-end engineering with strategic leadership, contributing to independent open-source browser development. His background spans DevOps and infrastructure architecture roles, technical directorships, and entrepreneurial ventures, with deep expertise in PHP, Java middleware and cloud-native operations. Jelle is an active open-source contributor to notable projects like SerenityOS, where he worked on desktop environment and kernel components, and to widely used PHP libraries, demonstrating a focus on code quality and practical usability. Based in Eindhoven, he pairs academic training in computer science and biomedical engineering with a pragmatic knack for turning complex technical requirements into maintainable systems.
13 years of coding experience
17 years of employment as a software developer
Biomedical Engineering, Biomedical Engineering at Eindhoven University of TechnologyComputer Science, Computer Science at Fontys University of Applied SciencesVWO N&T and N&G, VWO N&T and N&G at Gymnasium Beekvliet
Stackoverflow
71reputation
19kreached
3answers
0questions
Github Skills (17)
parserator10
c-language10
parser10
e-mail10
kernel10
php10
kernel-mode10
cprogramming-language10
operating-system10
unit-testing9
file-handling9
front-end-development8
disk-cache6
docker-volume6
docker6
Programming languages (18)
Github contributions (5)
SerenityOS/serenity
Jan 2021 - Jan 2023
The Serenity Operating System 🐞
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1321 reviews, 612 commits, 741 PRs in 2 years
Contributions summary:Jelle primarily contributed to the development of the Serenity Operating System's desktop environment, kernel and the development of Ports. Their work included adding support for overriding application icons, collapsing if-else statements in application files, and supporting icons for launchers. They also improved the codebase by implementing new functions. Additionally, they made contributions to the taskbar service.
kernelunixbrowserserenityoperating-system
php-mime-mail-parser/php-mime-mail-parser
Aug 2016 - Feb 2017
A fully tested email parser for PHP 8.0+ (mailparse extension wrapper).
Role in this project:Back-end Developer
Back-end DeveloperContributions:5 commits, 2 PRs, 5 comments in 6 months
Contributions summary:Jelle contributed to the email parser's functionality by addressing header retrieval, making it case-insensitive. They also enhanced the attachment handling capabilities by adding a filename strategy argument to the `saveAttachments()` function, providing more control over how attachments are saved. Further improvements included fixing maximum line length and correcting a comment related to random filenames, suggesting a focus on code quality and usability. This work demonstrates a deep understanding of the parser's core mechanics and attachment management.
mailparse-extensionmailphpemailmailparser
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