Full-stack developer. Front-end expert.
Sometimes tech lead, sometimes deep in the code.
I build things that work well for the people using them.
A running app for serious outdoor athletes. High-fidelity topography meets training science.
I'm building everything: product vision, design, front-end, back-end, infrastructure.
"Leveret treats trail running like the technical discipline it is — not a road run with hills."leveret.run
Building critical digital infrastructure for the Dutch government.
Working through ICTU on systems for IND (Immigration & Naturalisation Service) and RViG (National Office for Identity Data).
"Not public, but the kind of work where reliability and security aren't optional."
Website for the museum in Middelburg's medieval abbey.
30,000+ objects of Zeeland history. Built with Norday. Headless CMS architecture.
"Where centuries of Zeeland history meet modern web performance."zeeuwsmuseum.nl
Web platform for the port authority.
41 square miles. 30,000 vessels per year. 385,000 jobs. 6.2% of Dutch GDP.
"Building with Norday for one of the most economically significant organizations in NL."
Platform for the City of Rotterdam's employment initiative.
Helping 2,500+ people with support needs find meaningful work.
"Technology that creates real opportunities for people who need them most."
Senior Full Stack Developer building complex search and discovery interfaces.
React, Next.js, Apollo GraphQL. Working on the design system used across all products.
"Complex information architecture for professionals who need precision."sdu.nl
Tech Lead for Team Quarantine & Vaccination.
Built a platform for rapid website delivery — live within weeks of starting development.
"When the whole country needed information fast, we shipped it. Accessible to everyone."
From front-end developer to Chapter Lead for 35+ developers over 7 years.
Built the award-winning route planner (300,000 daily visits). Created the design system.
"Where I grew from developer to tech lead. 3.5 million members. High-volume traffic apps."
Leading teams, architecture decisions, code reviews, mentoring.
Have scaled engineering teams up to 40 developers across multiple squads.
"Good leadership is about making yourself unnecessary."
React, Next.js, TypeScript on the front. Node, APIs and headless CMS on the back.
Sanity, Contentful, Bloomreach, Statamic. Whatever fits the problem.
"The stack should serve the product, not the other way around."
Component libraries that scale. Documentation that developers actually read.
Keeping things consistent across teams without slowing anyone down.
"A good design system is invisible until you need it."
Technical audits. Stack decisions. Team assessments.
Helping organizations understand where they are and where they could be.
"Sometimes the best code is the code you decide not to write."
React Amsterdam
How we built ANWB's design system with (P)React.
Sharing code across teams, consistency, component architecture.
"A design system is a product, not a project."
React Amsterdam
Static analysis, type checking, and testing strategies for shipping quality code regularly.
How to structure your testing pyramid and when to use each layer.
"Tests should give you confidence, not false security."
Rotterdam The Hague Frontend Group
Deep dive into component library architecture.
Patterns for building flexible, composable components that scale.
"Good components disappear into the background."
Bloomreach CMS Connect
Mobile development approaches with web technologies.
When to go native, when to go hybrid, and how to make the most of both.
"The best technology is the one that ships."
Whether it's a project, a question, or just talking front-end.
Drop me a line at bart@waardenburg.dev