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Notes on answering leads, from the people who build Send4

Following up website and campaign leads, how business SMS and email work in practice, and the engineering behind the AI assistant. Product claims are checked against the app on the day we publish.

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Featured · Engineering 10 Nov 2026 7 min read

Ten leads, one 9:00 slot: how our AI assistant holds the time it offers to avoid double booking

When a burst of leads all get the earliest free time, the first yes wins and everyone else has to be asked again. So we made the assistant hold each time it offers.

Viktoras Lava CTO