SOS Button
One tap: an emergency report, coordinates to trusted contacts and camera video
What it gave the business
The client got a working emergency channel rather than an app: one tap fires three independent paths at once, so if one fails the signal still leaves through the other two.
The problem
A person in danger has no time to choose between calling, texting and hitting record. The app had to do all three from a single tap.
My role
Everything from the first screen to the server: mobile app, database and server logic, payments, deployment, domain.
What was built
- Phone sign-in: a one-time code through an SMS gateway wired into auth with a dedicated hook
- SOS flow: an emergency report carrying the statement text, coordinates and a video link
- In parallel: SMS to trusted contacts with coordinates and a short link, plus an event row in the database
- Front-camera video in storage behind signed URLs: 14 days, or kept forever if it was part of an SOS
- Subscription with recurring charges, tiers and promo codes
The engineering core
The infrastructure runs on an own server instead of a rented cloud: PostgreSQL with triggers and functions, auth with an SMS-gateway hook, storage behind signed URLs, Deno edge functions, own domain. Every node was built for a scenario where failure is not an option — which is why the signal has three independent paths.
Stack
Integrations
Tell me about your project
I will tell you how long it takes and what it costs before any work starts. If it is not my kind of task, I will say so right away and point you elsewhere if I can.
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