Writing on machine learning, web development, and security

Field notes from Spencer Calimlim on on-device machine learning, full stack web development, and hands-on security practice.

Featured note / Systems

picoCTF 2025 — my favorite solves

The picoCTF 2025 solves that actually taught me something, mostly about not trusting a boundary you have not read.

Recent writing

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How I actually went from fixing my friends' phones to shipping machine learning that runs on a phone.

Getting a bird-call model small enough to run on a phone, without losing the recordings I actually cared about.