Onyx Spain

Services

We build mobile applications

We design and build apps for iOS and Android, with the API and web panel they need behind them. We work project by project, remotely and from Granada.

What we do

  • Mobile apps for iOS and Android

    One Flutter codebase for both platforms. Geolocation, camera, notifications and light and dark mode, as in our Sentry app.

  • API and backend

    The logic and data the app needs, on Cloudflare Workers: role-based access, storage and alerts to the phone.

  • Web management panel

    A React panel for the people who run things: onboarding, rosters, reports and invoices. The app and the panel share the same data.

  • Design and launch

    Screens designed for people using them on site or in the office, a prototype before we build, and help publishing the app on the App Store and Google Play.

How we did it with Sentry

Sentry is the system a private security company runs its operations on. It is our reference case and the best way to see how we work.

  • Guard app (Flutter)

    Clocks in and out with a geofence, checks the week ahead and reports incidents, with a photo when the site requires it.

  • Management panel (React)

    Live map, rosters, incidents, staff with roles, and invoicing through to the PDF and the accounting export.

  • API (Cloudflare Workers)

    One API for the app and the panel, with different access for guard, supervisor, administration and management.

  • Urgent alerts

    Alerts that reach the phone and that the guard must confirm as read.

Technology

  • Flutter

    iOS and Android apps from a single codebase.

  • React and TypeScript

    Fast, maintainable web panels.

  • Cloudflare Workers

    API and data close to the user, with no servers to manage.

  • Push notifications

    Alerts to the phone with Firebase Cloud Messaging.

How we work

  • 1. We talk

    You tell us what you need and who will use it.

  • 2. We agree the scope

    In writing: what gets built, the timeline and the price.

  • 3. We build

    You see progress during the project, not only at the end.

  • 4. We deliver

    The code belongs to the client. If needed, we continue with improvements.

Who it is for

For companies and teams that need an app of their own. Our case is private security, but the method fits any business with staff in the field or processes that still run on paper and spreadsheets.

Onyx Spain is the name under which Manuel Cervantes Vico and Alejandro Castellón Martínez work from Granada. We work project by project: you talk directly to the people building your app.

Let's talk