What it is
A tool for sending text messages to large recipient lists, built for bulk communication and automation use cases.
The constraint that shapes everything
Sending to one recipient is a function call. Sending to many thousands is a queueing problem. The gateway has a throughput ceiling, delivery is asynchronous and best-effort, and the failure modes are partial by nature: some recipients receive the message, some do not, and the difference only surfaces later through delivery reports.
That pushes the design toward durable job state rather than in-memory batching. A blast has to survive a restart mid-send without either dropping recipients or messaging anyone twice.
My role
Built the tool and the send pipeline behind it.