# Andre Jilderda — Freelance front-end developer > Experienced front-end developer who moves your project forward. Hi, I'm Andre Jilderda — a freelance front-end developer based in Arnhem, the Netherlands. With 15+ years of experience and a background in design, I build solid websites and web applications that feel good to use and look great. With the experience I've gained from countless projects, big and small, I set the direction, contribute hands-on, and make sure everything runs smoothly. This is a Markdown version of , optimised for AI tools. ## What I do - Front-end developer (primary), designer, and certified Scrum Master. - **Languages:** TypeScript, JavaScript, HTML, CSS. - **Frameworks:** React, Astro. *Currently not taking on Angular assignments.* - **Tooling:** Vite, Storybook, Vitest, Playwright, Turborepo, and more. ## How I work I focus on **clean, scalable and future-proof code**: applications that are fast, stable and enjoyable to use. **Performance, accessibility and reusable components** are second nature. With my design background I translate designs effortlessly into code and add a bit of extra spark for a better end result. I also help teams work better together. As a certified Scrum Master I know agile inside out, but I stick to what works best for the team in practice — refining requirements, writing user stories, gathering input, wherever it helps most. ## Recent projects - **Powerchainger** *(Jan 2025 – present)* — Designer & senior front-end developer, freelance. Pilot in collaboration with Vattenfall to shift energy use to favourable moments and reduce peak load. Designed and built a Progressive Web App (React, TanStack Router, TanStack Query) that gives users real-time insight into energy consumption at device level. Implemented PWA functionality including notifications. Components developed and tested in Storybook. - **9292.nl** *(Jun 2023 – Aug 2025)* — Lead front-end developer, freelance. Set up new front-end architecture for the Dutch public-transport journey planner, used by millions of travellers monthly. Built the journey planner, station information, real-time departure times, subscription advisor, and content pages. Set up a flexible Storybook design system, wrote unit and component tests with Vitest, connected a headless CMS, and mentored three developers. Nominated for *Website of the Year* in the Mobility category. - **Shell** *(Nov 2022 – Jun 2023)* — Senior front-end developer, freelance. Built features for an internal React/TypeScript/GraphQL app for managing Proofs of Sustainability from renewable energy sources. Reduced tech debt, wrote unit and integration tests, and mentored a fellow developer in an international agile Scrum team. - **CloudNatix** *(Aug 2021 – Jul 2022)* — Senior front-end developer, freelance. Built a complex React app with dashboards, filters, server settings, data visualisations and APIs. Expanded the design system in Storybook. Wrote unit, integration and E2E tests. Front-end lead for several new features in a team of four senior front-end developers. - **Nederlandse Spoorwegen (Dutch Railways)** *(Oct 2019 – Aug 2021)* — Lead front-end developer in the Conversion Rate Optimisation team, freelance. Led many company-wide A/B tests with substantial conversion gains. Built a single-page Angular 10 wizard that helps consumers and business users decide on the right subscription. Built tooling and libraries for setting up and measuring A/B tests. Interim Scrum Master for two months. - **VodafoneZiggo** *(May 2018 – Oct 2019)* — Designer & front-end developer, freelance. Migrated Vodafone's Internet of Things platform to a new CMS with a modern front-end stack. Designed and implemented the Vodafone Smarter Working proposition. Facilitated design-system workshops for designers, developers and copywriters. - **Angi Studio** *(Sep 2012 – Jun 2018)* — Senior visual designer, front-end development team-lead and Scrum Master. Large online projects for Greenchoice, Municipality of The Hague, Sanoma, NEN, Triodos Bank, Reed Business International, International Business Cards and others. Set up reusable pattern libraries in Fractal. - **iWink** *(May 2010 – Sep 2012)* — Lead visual designer & front-end developer. Designed and/or built 60+ websites for Festival Zwarte Cross, Gasunie, Martiniplaza, Bevrijdingsfestival Groningen and others. Dutch Interactive Awards nominee in the *Best Corporate Website* category for the gasunie.nl redesign. - Earlier roles at **Koenencom / CMCR** (2009–2010) and **Landstra & De Groot** (2008–2009) as visual designer and front-end developer. In total: 150+ websites for international startups and large organisations. ## Education & certifications - Royal Academy of Art (KABK), The Hague — Graphic Design. - Hanze University of Applied Sciences, Groningen — Communication, Multimedia & Design (Bachelor's), specialisation Brand & Design Management. - Certified Scrum Master in interactive projects (2015). ## Working with me - Available for freelance front-end work; right now I take on a limited number of projects but always try to make space for the right ones. - Hourly or project-based, depending on what fits the assignment best. - Based in Arnhem, comfortable working remotely or in a hybrid setup. - Quick to pick up new tools and frameworks; happy to discuss specific needs. ## About me A few years ago I swapped the Randstad for the green city of Arnhem. In my spare time I trail-run, hit the gym, play indoor soccer, mountain bike, volunteer playing football with young people with mild intellectual disabilities, meditate, and work on hobby projects like [Dash](https://getdash.app) (a Figma plugin) or contribute to [open source](https://github.com/andrejilderda). This site itself is designed and built by me. It runs on [Astro](https://astro.build/), with [Alpine.js](https://alpinejs.dev/) for the few interactive bits. ## Contact - Website: - GitHub: - Registered at the Netherlands Chamber of Commerce under number 89978072. Reach out via the website for project enquiries — always up for a good chat.