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Aaron CastellsAC

Aaron Castells

AI & Full Stack Developer | LLM Integration

€300/day
Tarragona, ES
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Aaron

Full Stack Developer with over 5 years of experience transforming complex ideas into scalable digital products.

My specialty is the JavaScript/TypeScript ecosystem, creating robust architectures with React (Next.js) on the frontend and Node.js on the backend.

My differential value? I don't just develop the web, I make it intelligent. I help companies integrate AI and LLMs (like GPT/Claude) into their existing products to automate processes and improve user experience.
  • Catalan

    Native or bilingual

  • Spanish

    Native or bilingual

  • English

    Conversational

Can work on-site
Tarragona (up to 50km)

Experience

  • Trazable
    Full Stack Developer
    TECH
    June 2022 - June 2025 (3 years)
    Valencia, Spain
    Develop reusable components using React, Tailwind CSS, and Storybook
    Develop new features for the platform (Vite, NodeJS)
    Refactor legacy code and integrate Tanstack Query
    Develop new products (NextJS, Node, Bubble)
    AI Agent Development
    React.js Node.js Google cloud Typescript LLM
  • Goxo City SL
    Fullstack developer
    DIGITAL AND IT
    June 2021 - June 2022 (1 year)
    Madrid, Spain
    Develop new features for a restaurant digitization platform. (Next js)
    Integrate third-party services into the platform. (Cabify, Stripe, Deliverect)
    React.js GO Node.js
  • Emburse Captio
    Tier 2 Customer Support Expert II
    September 2016 - Today (9 years and 9 months)
    Deltebre, Cataluña, España
    + Giving support to both external clients and internal teams at Emburse Captio + Developing internal apps

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Education

  • Higher Technician
    IES Montsia
    2017

Skill set

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