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.

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.

Built for Umbraco

Open source, for the CMS behind most of that work.

blur-placeholder
Image placeholders generated once, in Umbraco.
Generated when the image is saved and handed to the frontend as one string. Public requests do no work.
Look insideDocs Source
web-analytics
Vercel and Plausible reports inside the Umbraco backoffice.
Traffic, and the numbers for the page being edited, without opening another tab. It reads the analytics you already run.
Look insideDocs Source
@charlietango/umbraco-rich-text
Umbraco rich text, rendered as React components.
Renders the Delivery API rich text JSON as React, with a hook to swap any node or block for a component of your own.
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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.

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 insideDocs Source20M 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.

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

MDT+

A clinical tool for preparing and discussing cancer cases, bringing patient data and AI recommendations into the same workflow.

Frontend lead · 2024

MDT+ is used by doctors preparing for multidisciplinary cancer conferences, where specialists meet to review patient cases and decide on treatment.

I built the Next.js application used to create and prepare patients for those conferences. The interface brings the relevant clinical data together with recommendations from an AI model, so doctors can review both as part of the same discussion.

The challenge was less about presenting an AI answer and more about making a large amount of clinical information useful in a setting where people need to understand it quickly. The AI is one source of information among many. The interface has to make that relationship clear and give the doctors enough context to make their own decision.

I was responsible for the frontend architecture and implementation, working with complex healthcare data and the different states that come with real patient workflows.

MDT+ is now being introduced at several hospitals in Denmark, with further expansion planned outside Denmark.

Client: Center for Surgical Science
Technology: Next.js, NextAuth, Tailwind CSS
Work: Frontend architecture, application development, clinical workflows and technical quality