Cees-jan Kiewiet
Senior Software Engineer at SurveyMonkey
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolCees-jan Kiewiet is a Senior Software Engineer based in Amsterdam with 15 years of experience building high-performance PHP systems and asynchronous tooling. He is a core maintainer in the ReactPHP ecosystem and an active contributor to well-known projects like reactphp/http, reactphp/event-loop and CakePHP, with a particular focus on async programming, performance optimizations and TLS/DNS robustness. At SurveyMonkey (following Usabilla’s acquisition) he brings production-grade backend expertise alongside hands-on DevOps work such as Windows support for Phansible and Vagrant/Ansible automation. Colleagues know him for pragmatic, testable improvements—examples and benchmarks he authored often clarify complex async patterns for other developers. He combines deep protocol-level knowledge (AMQP/RabbitMQ examples in the Bunny library) with a taste for developer experience and tooling that makes distributed, event-driven systems easier to build and maintain.
15 years of coding experience
8 years of employment as a software developer
MBO3, System Administration, MBO3, System Administration at Horizon College
Github Skills (51)
asynchronous10
socket-io10
ss10
cakephp10
middleware10
ssl10
amqp10
console10
async10
reactphp10
es6-promise10
amqp-client10
testing10
http10
sslv310
Programming languages (24)
Github contributions (5)
igorw/evenement
Jul 2017 - Sep 2022
Événement is a very simple event dispatching library for PHP.
Role in this project:
Backend Developer
Backend DeveloperContributions:7 reviews, 81 commits, 74 PRs in 5 years 3 months
Contributions summary:Cees-jan primarily focused on improving the performance and functionality of the event dispatching library. Their contributions included implementing benchmark scripts to measure performance, optimizing the code by replacing `call_user_func_array` with argument unpacking and using variadic functions. They also addressed code maintainability by adding copyright notices and testing different callable types.
event-dispatchingphpdispatchingdispatcher
reactphp/event-loop
Jun 2014 - Nov 2022
ReactPHP's core reactor event loop that libraries can use for evented I/O.
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 releases, 39 reviews, 87 commits in 8 years 6 months
Contributions summary:Cees-jan primarily contributed to the testing and benchmarking of the ReactPHP event loop, focusing on memory usage and performance metrics. They added examples to test memory consumption under different loop configurations and integrated usage instructions. The user also enhanced the test script, incorporating command-line arguments for loop selection and execution duration. Furthermore, they added support for signal handling within the `StreamSelectLoop`.
event-loopreactorphpstreamsloop
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