Engineering Blog

Engineering deep-dives from the SlashFeed team — Elixir, Phoenix, and how the product is built.

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Adding passkeys to a Phoenix app with wax_

How I added WebAuthn / passkey authentication to SlashFeed using the wax_ library — the data model, the JavaScript dance, the origin-binding gotcha that ate an afternoon, and the testing strategy for code that needs a real browser to fully exercise.

Apr 23, 2026

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