Jeroen De Graaf
Staff Software Engineer Backend at TicketSwap
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolJeroen De Graaf is a Staff Software Engineer specializing in backend systems with 10 years of experience building resilient, well-architected platforms at TicketSwap. He focuses on Domain-Driven Design, CQRS, Event Sourcing and Hexagonal Architecture to turn complex business domains into maintainable, testable systems. Progressing from senior developer to lead and now staff engineer, he combines hands-on PHP backend craftsmanship with architectural leadership and team coaching. An active open-source contributor, he has improved PHP tooling like phpro/grumphp by expanding Deptrac formatter support and test coverage, showing attention to developer experience as well as runtime behavior. Based in Amsterdam with a Master's from TU Delft, he brings a pragmatic systems mindset rooted in both engineering and design thinking.
10 years of coding experience
15 years of employment as a software developer
Master of Science Architecture Real Estate & Housing: Design & Construction management, Master of Science Architecture Real Estate & Housing: Design & Construction management at Delft University of Technology
Github Skills (7)
unit-testing10
php10
software-quality10
baseline9
junit9
xml9
git-hooks8
Programming languages (3)
Github contributions (5)
phpro/grumphp
Sep 2019 - Mar 2022
A PHP code-quality tool
Role in this project:
Backend Developer
Backend DeveloperContributions:1 review, 8 commits, 3 PRs in 2 years 6 months
Contributions summary:Jeroen primarily contributed to the project by implementing and modifying features related to the Deptrac task within the grumphp tool. They addressed issues with the Deptrac graphviz options, correcting behavior and adding options for different formatters like XML and baseline. Their work involved modifying the `src/Task/Deptrac.php` and `test/Unit/Task/DeptracTest.php` files, demonstrating a focus on expanding functionality and improving the user experience. These changes involved adding options and features related to different formatters such as JUnit and baseline.
composer-plugingit-hooksphpcode-qualityconventional-commits
papyrusphp/ramsey-uuid-identity-generator
Oct 2022 - Sep 2023
Implementation of papyrus/identity-generator, based on ramsey/uuid
Contributions:1 release, 33 reviews, 34 PRs in 11 months
uuid-generatoruidnanoididentifiercqrs-es
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.