David Frost

Software engineer working on cloud infrastructure at Capital One.

Now

I'm building Retrofolio, a portfolio backtester I started because I wanted to know what would have happened if I'd actually held the things I almost bought. At Capital One I work on the network infrastructure behind the web and mobile apps, mostly cloud engineering, infrastructure-as-code, and CI/CD.

Projects

Retrofolio — A portfolio backtester built with Next.js and FastAPI. Long-running backtests run through an async task pipeline so the UI stays responsive. Started it because every investing decision comes with a nagging "what if I'd just held it" question.

Smart Lamp — IoT lighting system built with Raspberry Pi, MQTT, and Bluetooth for real-time control. Backed by a Django web dashboard with WebSockets and a native iOS app in Swift, with Ansible handling provisioning. Built four full-stack interfaces around a single physical device for a distributed systems course.