👋 Hi, I am Andre Jilderda,
Freelance front-end developer with a passion for design &TypeScript.
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About my work
14+ years online experience as a developer & designer
I am a front-end developer with a strong foundation in design, which leads to better user experiences in less time.
Front-end development
I have extensive knowledge of HTML, CSS & JavaScript (ES6), TypeScript and experience with the 3 most popular frameworks (React, Vue & Angular*). Add ambition, endless curiosity and a GTD‑mindset and you have a pretty complete picture of me.
*I'm not taking on jobs involving Angular or Vue at the moment, sorry!
Digital designer
I speak the designer mumbo-jumbo and dare to make design decisions while coding. This saves valuable development time, endless ping-ponging with designers and often looks even better than the original design. I also do not hesitate to work out something in Figma or Sketch myself.
Curriculum Vitae
I’ve worked on more than 150 websites for great organizations
From international startups to large organizations such as the Dutch Railways and VodafoneZiggo.
- Lead front-end developer, freelance
- 9292 REISinformatiegroep, Utrecht
- June 2023 – now
- Tooling
Astro, TypeScript, React, Vitest, Storybook, Tailwind CSS, and more
- Work & reponsibilities
- Set up a new front-end architecture for 9292.nl, focusing on speed, scalability, and future-proofing,
- Built the Reisplanner – the core of 9292 that helps millions of travelers plan their journeys every month,
- Developed additional website functionalities such as station information, real-time departure times, subscription advisor, content pages, and more,
- Set up a flexible design system in Storybook to boost productivity and ensure consistency,
- Wrote unit and component tests using Vitest and Storybook to ensure stability,
- Integrated a headless CMS for easy and efficient content management,
- Mentored three developers and fostered a positive, proactive team culture,
- Met both deadlines and ensured everything went live on time and stress-free.
- Senior front-end developer, freelance
- Shell Renewables and Energy Solutions, Rotterdam
- November 2022 – June 2023
- Tooling
TypeScript, React, GraphQL, Apollo Server, Testing Library/Jest, Storybook, styled‑components
- Work & reponsibilities
- Develop features for an internal application built with React, TypeScript & GraphQL that administers Proofs of Sustainability of renewable energy sources among other things,
- Reduce technical debt and improve the code quality
- Write unit and integration tests,
- Create user stories and streamline the development process,
- Mentoring a co-developer,
- Work within an international agile Scrum team.
- Senior front-end developer, freelance
- CloudNatix, Silicon Valley (US) - Remote
- August 2021 – July 2022
- Tooling
TypeScript, React, Testing Library/Jest, Cypress, Storybook, styled‑components, REST API's
- Work & reponsibilities
- Developing a complex React application with a lot of interaction and state. Think of dashboards, filters, server settings, data visualizations and communicating with APIs,
- Expand the design system and document new components in Storybook,
- Writing unit, integration and E2E tests,
- Front-end lead for the planning and development of several new features,
- Work in an agile Scrum team of 4 senior front-end developers.
- Lead front-end developer @ team Conversion rate optimisation, freelance
- NS / Dutch Railways, Utrecht (NL)
- October 2019 – August 2021
- Tooling
JavaScript, TypeScript, Angular, RxJS, Jest, REST API's, Alpine.js, HTML, CSS/Sass, eslint, Webpack + Babel, Handlebars, Relay42, Git, Bamboo, Azure, Figma
- Work & reponsibilities
- A/B-testing: develop new features and optimisations throughout the entire NS-website,
- Developed a wizard that helps consumers and business users decide on what subscription best fit their needs (single page Angular 10 app),
- JavaScript tooling and libraries to make it easier to setup and develop A/B-tests,
- Develop, optimise and maintain new page-templates for subscriptions and business context,
- Helped the team to improve the development process and code quality,
- So, how much extra conversion did this bring in? Loads. ;)
- Interim-scrum master for a period of 2 months.
- What I do
- Front-end developer (primary), designer & scrum master
- Languages
- TypeScript, JavaScript, HTML, CSS/Sass/BEM
- Frameworks
- React, Vue, Angular
- Tooling
- Vite, Turborepo, Nx, Webpack, Babel and more
🔍These are just a few of the technologies I’ve worked with. Are you looking for specific skills? Don't hesitate to ask!
Six things you probably like to know from me
Unfortunately, I'm currently not available for another freelance job. But you can always get acquainted, who knows, maybe I can put you in touch with someone from my network.
My hourly rate is €98,50 per hour.
I am a real hands-on worker and I am constantly experimenting with new techniques and tools. So I'm used to making things my own quickly. Are you looking for very specific skills? Please contact me to see if I can help you with that!
A few years ago I exchanged the Randstad for green Arnhem in the Netherlands. Is Arnhem too far away from your organization? No problem, I'm used to working remotely. A hybrid model (for example x days in the office) is also possible.
React framework Next.js, TypeScript and Tailwind CSS. The initial draft I built with Eleventy, but moved to Next.js for the nicer developer experience. I’m now thinking of porting it to Astro, which is a much better choice for simple landing pages like this (but didn’t exist in 2020). Why? Astro ships zero JavaScript by default and has great lazy loading capabilities out of the box (and is therefore fast). It’s what I’ve used for the Dash landing page also.
When I'm not running through the picturesque landscapes around Arnhem, you'll find me at the gym, playing indoor soccer or on a mountain bike. Being a dedicated meditator I take care of my mental well-being and believe that it's essential for living a balanced life. My evenings are often spend tinkering away on some side project (like Dash, a plugin for Figma) or working on open source code.
Feel free to contact me if you're looking for a communicative front-end developer who is passionate about creating great user experiences or just want to have a chat.
Andre JilderdaFreelance front-end developer
Registered at the Netherlands Chamber of Commerce Chamber under number 89978072.