FRONTEND
DEVELOPER
Hi! I'm Koen De Vulder. Aspiring Frontend Composer | Crafting Harmony with React | Fueling Curiosity with Coffee.
Experience Breakdown:
- Frontend: 4 years and 3 months
- Backend: 1 year and 8 months
Based on:
- Started December 2020
- 40h work week (Mon-Fri)
- 32 days off per year
- Updates hourly
I create meaningful digital experiences that combine aesthetics with functionality and performance.
This is me
Hi, I'm Koen.
I'm a frontend developer with experience in building web and mobile applications using React, React Native, and Angular. My work focuses on creating responsive and user-friendly interfaces.
I prioritize delivering optimal user experiences by considering the audience's needs and project requirements. Currently, I'm expanding my expertise in React and JavaScript to become a full-stack React developer and mentor others in the tech community.
Beyond coding, I enjoy playing the piano, baking, cooking, and gaming. I also stay updated with the latest tech developments by watching YouTube and following tech news.
My Stack
frontend
PostHog
VS Code
React Query
Javascript
HTML
RxJs
React
Figma
PrimeReact
ViteJs
Cursor
(Framer) Motion
Tailwind
CSS
Google Analytics
Angular
Typescript
WordPress
Cypress
Playwright
Vitest
WebFlow
Redux
NextJs
Storybookbackend
.Net
Payload CMS
C#
NodeJsdatabase
SQL Server
FirebaseWork Experience
Front-End Developer
2025-04-17 - PresentDeveloped and designed the complete Certifisc website from concept to production.
Key Responsibilities:
- Led the full design process using Figma, iterating with business stakeholders to achieve the final design
- Developed the entire frontend using modern web technologies
- Implemented custom integrations with Asana for automated appointment-to-ticket conversion
- Integrated PayloadCMS for company-wide content management
- Created and produced all website media including videos and photography
- Implemented SEO optimization strategies
- Set up analytics and tracking with Google Analytics and PostHog
Front-End Developer (Consultant)
July 2022 - April 2025Provided frontend expertise as a consultant for Codesense, contributing in major digital transformation projects for logistics and public sector clients.
Projects:
Tabaknatie (Aug 2023 – Apr 2025):
- Rebuilt three legacy React Native warehouse applications, migrating codebases from JavaScript to TypeScript.
- Developed a comprehensive planning tool in Next.js/.NET for warehouse logistics management.
- Optimized workflows with QR/barcode automation to minimize manual input and streamline processes.
- Technologies: React Native, TypeScript, Next.js, .NET
Digipolis (Jul 2022 – May 2023):
- Refactored a city mapping tool from AngularJS to Angular 15, maintaining backend compatibility while modernizing the frontend architecture.
- Enabled dynamic creation of roadwork zones and automated notifications to local residents to ensure timely alerts.
- Technologies: AngularJS, Angular 15, JavaScript, TypeScript
Front-End Developer
July 2022 - May 2023Independently refactored an AngularJS mapping tool to Angular 15, updating the frontend while retaining the backend. Users could draw roadwork zones on the map, triggering notifications to residents in affected areas, ensuring timely localized alerts.
Back-End Developer
November 2020 - July 2022
Participated in building a backend planning system for optimizing chocolate factory processes. Utilized drag-and-drop interfaces to streamline scheduling and resource allocation, improving batch efficiency and production management.
My Projects
Unwindr Event Planner
2025A collaborative team event planning platform that simplifies organizing social gatherings. Features democratic voting for dates and restaurants, real-time chat, RSVP management, and smart notifications to make team hangouts effortless.
Certifisc Website
2025A fully custom-designed website for Certifisc with complete design, development, and content management implementation. Features seamless Asana integration and PayloadCMS for dynamic content.
React Guide
2025An interactive React application designed specifically to teach fundamental React concepts (like hooks) to .NET developers through side-by-side code comparisons and live, editable code examples.
Portfolio V2
2025My current, enhanced portfolio website built with Next.js and plain CSS. It features an integrated CMS for effortless content management, a superior mobile experience, and subtle animations.
Portfolio V1
2025My first personal portfolio website, built using Vite, designed primarily to showcase my frontend projects, provide my resume for download, and offer a basic contact method.
Road Work Planner
2025An Angular web application utilizing the Google Maps API, enabling city planners or companies to visually map planned road works, automatically identifying and facilitating notifications for affected addresses.
Cargo Loader
2025A React Native mobile app for Zebra devices that validates and tracks cargo items by scanning barcodes as they are loaded onto shipments, ensuring accuracy and security.
Cargo Load Count
2025A React Native mobile app for Zebra devices used during unloading to quickly count cargo by scanning one item for details and then entering stack dimensions.
Cargo Inspector
2025A React Native mobile inspection tool for Zebra devices allowing users to scan cargo, record detailed inspection results (issues or approval), and update its status in the logistics workflow.
Transport Issue Logger
2025A web application built with Next.js and PrimeReact for logging and managing various operational issues within a transport company, featuring a highly customizable interface for defining issue types and details.
Get In Touch
Interested in working together?
Let's connect.
I'm always open to discussing new projects, creative ideas, or opportunities to be part of your vision. Feel free to reach out if you're looking for a developer who can bring your ideas to life.