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Antonio Cantero RuizAC

Antonio Cantero Ruiz

Independent Engineer · Flutter · Full-Stack · From

320 €/día
Jaén, ES
8-15 años

Tiempo medio de respuesta: 1h

Acerca de Antonio

I build production software. Not prototypes, not MVPs that die in staging — apps that ship to the App Store and Google Play, serve real users, and stay maintained.

I've been doing this for 10 years. My core is mobile: Flutter and React Native for iOS and Android. But I genuinely cover the full stack — backend in Laravel or Node.js, web front-end in React or Astro — without subcontracting the parts that need connecting.

Since 2024, I work AI-native. That means a RAG in production for an app with tens of thousands of active users, an on-device AI engine that runs entirely on the phone without any external API, and an autonomous multi-agent pipeline for real-time monitoring and structured delivery. Not planned features —running systems.

I work well with non-technical founders. I make architecture decisions, explain trade-offs without jargon, prioritize around the business, and get a product live without accumulating unnecessary technical debt. If you need one engineer who owns
the whole thing — I do that.

Tell me what you want to build.
  • Español

    Bilingüe o nativo

  • Inglés

    Competencia profesional completa

Solo teletrabajo
Lleva a cabo sus proyectos principalmente en remoto

Experiencia

  • Freelance
    Software Engineer
    mayo de 2022 - Hoy (4 años y 3 meses)
    Jaen, Spain
    Worked across multiple parallel client and personal projects as sole technical
    lead — mobile, backend, and AI — owning the full cycle from architecture to production.

    Core pattern across all engagements: one engineer covering the complete stack. Flutter and React Native for iOS and Android, backend in Laravel or Node.js, web front-end in React or Astro. No handoffs, no subcontractors.

    Fractional CTO work for early-stage startups: architecture decisions, stack evaluation, trade-off analysis, and technical roadmap alongside non-technical founders. Ongoing advisory role in production AI systems for a startup with active users.

    AI integration since 2024 — production work, not experiments:
    · RAG pipeline with LLM in production (retrieval, caching, context management)
    · On-device AI inference in a mobile app — no cloud API, fully private
    · Autonomous multi-agent pipeline for monitoring and structured delivery

    8+ apps shipped across health, real estate, education, and sustainability —
    each from first architecture decision to App Store and Google Play.
    Tech Lead Mobile Applications Flutter Desarrollo Full Stack Clean Architecture
  • Rosita Longevity (Hearts Radiant)
    Product Engineer
    EDUCACIÓN & E-LEARNING
    marzo de 2022 - junio de 2023 (1 año y 3 meses)
    Valencia, Spain
    • Architected and implemented robust mobile app designs to deliver exceptional user experiences.
    • Took ownership of implementing new features, leading successful outcomes.
    • Implemented a comprehensive end-to-end testing suite, covering critical user flows, to ensure the app's stability and reliability across different devices and platforms.
    • Mentored and supported junior developers, enabling them to make meaningful contributions to the team's productivity.
    Mobile Applications Flutter React.js Typescript Mentoring
  • Signa Sports United
    Software Engineer
    E-COMMERCE
    septiembre de 2020 - diciembre de 2021 (1 año y 3 meses)
    Barcelona, España
    • Redesigned and implemented robust mobile apps for optimal user experiences, driving high engagement and retention rates.
    • Led the implementation of new features, delivering successful outcomes on time and within budget.
    • Introduced a testing layer and optimization techniques to identify and resolve bottlenecks, resulting in improved app responsiveness and reduced loading times.
    • Mentored and coached junior developers to cultivate a strong team culture, resulting in improved productivity and quality standards.
    Flutter Kotlin Swift Testing Clean Architecture

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