Kevin Van Rooijen - Founder Owner at Pijappi

Kevin Van Rooijen

Founder Owner at Pijappi

Gouda, South Holland, Netherlands

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Summary

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Senior

🎓

Top School

Kevin Van Rooijen is a versatile founder and web developer with 13 years of professional experience and over 15 years building mobile and web products through his company Pijappi. He has led development teams and shipped apps and responsive sites across Android, iOS, Amazon and telecom platforms for clients like Vivo, O2 and Vodafone, combining front-end design sensitivity with back-end engineering. Kevin's background includes multimedia engineering and device database maintenance for mobile platforms, giving him deep practical knowledge of cross-device compatibility and performance constraints. He contributes to open-source tooling for data validation in the Clojure ecosystem, improving schema features and default-handling in the well-regarded metosin/malli library. Comfortable moving between hands-on coding, client training, and product delivery, he brings entrepreneurial drive and a pragmatic focus on turning ideas into reliable, user-focused software. Based in Gouda, Netherlands, he also pursues formal studies in PHP/MySQL and language skills, reflecting a continual commitment to broadening his technical and cultural toolkit.

13 years of coding experience

9 years of employment as a software developer

NIMA A1-A2, NIMA A1-A2 at NCOI Opleidingen

Animation and Games, Animation and Games at Grafisch Lyceum Rotterdam

HAVO, HAVO at Antonius College

4th year Spanish language course, 4th year Spanish language course at Volksuniversiteit Gouda

PHP en MySQL professional, PHP en MySQL professional at LOI

Dutch, English, Spanish, German

Github Skills (12)

clojure10

data-structures10

data-structrues10

data-validation10

xml-schema10

schema10

clojure-cli10

clojurescript10

data-structure10

transformation9

testing7

json-schema6

Programming languages (16)

JavaRustElmValaErlangGDScriptTypeScriptQML

Github contributions (5)

metosin/malli

Apr 2020 - Jul 2020

High-performance data-driven data specification library for Clojure/Script.

Role in this project:

Back-end Developer

Contributions:5 commits, 4 PRs, 8 comments in 3 months

Contributions summary:Kevin contributed to the `malli` library by implementing and refining features related to data validation and schema definition. Their work included adding support for qualified keywords and map entry syntax within the schema language. They also addressed conditional logic and added default value handling for core utility functions within the library. These changes suggest a focus on enhancing the library's core functionalities for defining and validating data structures.

transformationdata-drivenvalidationgeneratorsclojurescript

kwrooijen/melpa

Apr 2015 - Jan 2021

Scripts for building Emacs packages from Version Control

Contributions:5 pushes, 5 branches in 5 years 10 months

elispversion-controlspacemacsemacsemacs-lsp

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