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Welcome — I’m Daniel Allen, a software application developer focused on building practical, data-driven and AI-assisted systems.

Here you’ll find a snapshot of my journey — a selection of projects that shaped how I think and build. Explore the full portfolio →

I build practical systems and care about how they hold up once real people use them — what happens when the input is malformed, when a service is down, or when someone comes back to the code six months later and has to understand it.

Most of what I have learned came from finishing things rather than starting them: getting a system deployed, writing the tests that stop a fixed bug coming back, and writing down the reasoning so it outlives my memory of it. The portfolio has the detail on each project, including what broke and what I did about it.

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