Writing launch copy that engineers believe

The fastest way to lose an engineer's trust is to write launch copy that overstates what the product actually does. The fastest way to keep it is to write copy they want to share.

The rule we apply: every claim on a launch page maps to a line of code, a database query, or a measurable behaviour. If we cannot point to it in the codebase, we do not say it on the page. "Sub-second responses" maps to a p99 dashboard. "Type-safe end to end" maps to a tsconfig and a CI check. "Realtime" maps to a subscription channel.

This is also good marketing. Specificity is more memorable than abstraction. "We render every above-the-fold image in under 1.2s on 3G" is a sharper claim than "blazing fast." It also makes you look like you know what you are doing, because you do.