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Eduardo SanchezES

Eduardo Sanchez

Full Stack Developer

€100/day
Salamanca, ES
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Eduardo

Backend Engineer specializing in Node.js and the design of scalable APIs for real-world applications.
I have developed complete systems in production, including booking platforms, CRMs, and mobile applications, managing everything from backend architecture to frontend integration.
Currently, I am developing Shishapp, a full-stack mobile application with a backend in Fastify + Prisma + PostgreSQL, which includes authentication, inventory management, ticket OCR, and complex business logic.
I focus on creating robust, maintainable systems that are ready to scale from the outset.
  • Spanish

    Native or bilingual

  • Catalan

    Native or bilingual

Can work on-site
Salamanca (up to 10km)

Experience

  • Shishapp
    Full Stack Developer (Founder)
    ENTERTAINMENT AND LEISURE
    November 2025 - Today (9 months)
    Salamanca, Spain
    Development of Shishapp, a mobile application aimed at the hookah community that allows personal tobacco inventory management, discovery of new flavor combinations, and facilitates mixture preparation.

    The application includes an interactive flavor roulette that generates random tobacco combinations to help users discover new mixtures quickly and enjoyably.

    I have designed and developed the entire full-stack architecture of the product, including the mobile application, backend, and administrative tools.

    The system is built with React Native (Expo) on the mobile client and Fastify + Prisma + PostgreSQL on the backend, following a modular architecture that allows for project scaling and sharing of types and logic across different services.
    React Native OpenAPI REST API JWT Authentication Software Architecture
  • Alsis IoT
    Frontend Developer
    INTERNET OF THINGS (IOT)
    July 2025 - April 2026 (9 months)
    Salamanca, Spain
    Development and leadership of the frontend for an enterprise web platform for optimizing and analyzing logistics routes in the agri-food sector. Implementation of an advanced SPA with React and TypeScript, focused on intensive data usage and operational users.

    Design of complex interfaces with Material UI and MUI DataGrid, including high-performance tables with virtualization, master-detail rows, dynamic expansion, advanced filters, accent-insensitive searches, custom sorting, and multi-step editing modals. Integration of advanced forms and validations with React Hook Form and Yup.

    Integration with Google Maps API for visualizing routes, optimized paths, and custom markers, combining tabular and geographical data in real-time. Development of dashboards and analytical views with different modes (daily, historical, comparative), aimed at facilitating decision-making.

    Continuous optimization of performance and user experience, reducing unnecessary renders, improving load metrics (LCP, INP), and ensuring smooth navigation on screens with large volumes of information. Focus on maintainability, component reusability, and code quality in a real production environment.
    Typescript React.js Front-end Interface Development MUI Web Optimization
  • Freelance
    Full Stack Developer
    RETAIL (SMALL BUSINESS)
    January 2024 - February 2025 (1 year and 1 month)
    Salamanca, Spain
    Full Stack Developer specializing in backend, focused on the design, development, and maintenance of robust and scalable systems. Experience in creating a CRM for an electronics store in Chile, optimizing customer, sales, and commercial tracking management. Additionally, participated in the development and evolution of a reservation management platform for the Wanderlust restaurant chain in Spain, improving operational efficiency and user experience through efficient and maintainable technical solutions.
    Typescript Backend Service Development External API Integration MySQL React.js

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