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Engineering

How the thing you see is built: the technical decisions, the mistakes that cost us, and why we picked each path.

All Product12 Guides3 Case studies2 Engineering1 Vision2

Why we built our own notification engine

On October 1st Meta starts charging for service messages. How we modelled the cost, and why we ended up writing the channel ourselves.

Matías, founder of CircliSeptember 3, 2026