Onyx Spain

Onyx Spain · Granada

Operational software for security companies.

A studio in Granada, Spain. We build the software a security company runs on; Sentry is the case. Also backend, websites, mobile apps, and custom systems.

Four ways we build with you

  • Backend & APIs

    APIs, microservices, and databases built to grow. The system holds when the business takes off, not only on launch day.

  • Web development

    Fast, clear, carefully made websites and web apps. From the first screen to the last interaction detail.

  • Mobile apps

    iOS and Android held to the same standard as desktop. Native or cross-platform, depending on what the project needs.

  • Custom software

    Full-stack architecture from start to finish. One team, from the idea to deployment, responsible for the whole system.

Who we are

Two full-stack developers in Granada, Andalusia. We work remotely with private security companies across Spain. Onyx Spain builds operational software for private security companies.

We carry the project ourselves, from the first conversation to the code in production. The price is that of a studio just starting: you pay for the work, not for an agency structure. Quality is how we intend to earn a place in this field.

  • Manuel Cervantes Vico — Full-stack development
  • Alejandro Castellón Martínez — Full-stack development

From the idea to production

  • Idea

    We listen to the business before writing a line. We define the problem, the scope, and what must be true on day one.

  • Design

    We turn that into interface and system. Hierarchy, rhythm, and an experience that feels as clear as it looks.

  • Build

    We build the product end to end: APIs, web, and mobile, with the same standard in every layer.

  • Launch

    We leave it in production, measurable, and ready to grow. Launch is the start, not the end.

A short method, without the theatre

Five steps. The same team from start to finish, with work you can actually see.

  • Discovery

    Short conversations and the real context: timeline, team, risk, and what must not break.

  • Definition

    Closed scope, architecture, and a plan you can follow. No surprises halfway through.

  • Build

    Frequent deliveries, reviewed code, and a demo of the product, not of a slide deck.

  • Launch

    Deployment, observability, and a handover so your team can run it.

  • Evolution

    After launch we stay: performance, improvements, and whatever the data asks for next.

Sentry, operational surveillance

A real case of operational surveillance for a private security company: mobile app, web dashboard, and API.

Sentry

An operational surveillance product for a private security company. Guards clock in and report incidents from their phone; management sees a live map, rosters, reports, and invoicing.

Onyx Spain is the studio in Granada, Spain, behind that case. Backend, web, mobile, and custom software start from how a security company operates.