Daniel Schmidt

Frontend engineer working on the difficult parts between product, design and engineering.

I care about architecture, accessibility, performance and developer experience, and about building things that are still pleasant to work with years later.

Scroll to fly

The day job

At Charlie Tango, I help set the technical direction on larger web projects while staying hands-on as a developer.

I’ve helped shape our frontend platform and engineering practices, led frontend architecture, improved accessibility and testing, mentored developers, and built tooling that makes the work easier for the teams using it.

1. 2026Viaplay Sport NewsSports newsroomUmbraco Awards runner-upSports news, clips and video, backed by a custom Umbraco newsroom built for live publishing.
2. 2025SundhedsstyrelsenPublic healthA new public health platform built as a shared multisite setup, with accessibility and maintainability treated as part of the architecture.
3. 2024MDT+Clinical decision supportA clinical tool for preparing and discussing cancer cases, bringing patient data and AI recommendations into the same workflow.
4. 2023FeriepartnerHoliday bookingHoliday-home search and booking, with a map and result list that work together across desktop and mobile.
5. 2022EDCProperty platformA content-heavy property platform with a custom React layer integrated into .NET.
6. 2020VælgererklæringPublic serviceAn accessible and secure public service for giving and withdrawing voter declarations.
7. and many more

Open source

I maintain react-intersection-observer, a React library downloaded around 20 million times a month, along with a handful of other projects.

Open source is where I get to scratch the kinds of technical itches that turn up repeatedly in real projects, and occasionally discover that several million other people had the same itch.

1. react-intersection-observer

   Tell a React component when it enters the viewport.

   A hook, a render prop, and a component over the Intersection Observer API. It reuses observers where the options match, and ships a test mock so tests do not need a browser.

   Look insideDocsSource20M downloads a month

It’s a Unix system!

When I saw Jurassic Park back in 1996, the dinosaurs were cool. But not as cool as the “unix” file system, flown through in 3D to lock the doors. I have wanted to build one ever since.

1. FSN

   Visualize and navigate your file system in 3D space.

   Point it at a folder and the files stand up in front of you, in the same arrangement every time you open it.

   Source

One got out

It has been hanging over the canyon since 1978, and there are fifty-four more behind it.

Say hello

• hello@thebuilder.dk
• GitHub
• X@teh_builder
• LinkedIn