Freelance Full-Stack Developer | Django | AI Products | Python & LLM Integration en España

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Freelance Full-Stack Developer | Django | AI Products | Python & LLM Integration based in Spain. As a Freelance Full-Stack Developer, you will contribute to the ongoing development of an evolving AI-powered product at the intersection of artificial intelligence and marketing intelligence. You will build and enhance full-stack features using Python and Django, while integrating large language models and third-party APIs to deliver practical, high-value capabilities. Working with a small, experienced team, you will have meaningful ownership over your work and the opportunity to influence technical decisions and product direction. You will combine strong software engineering fundamentals with modern AI-assisted development practices to build clean, maintainable, and scalable solutions. This fully remote, part-time engagement offers flexibility and autonomy, with approximately 60 hours of work per month. It is an opportunity to contribute directly to a live AI product with an ambitious roadmap and room for new ideas. Accountabilities: You will contribute to the full development lifecycle, from implementing product features to integrating AI services and improving the codebase, working independently while collaborating closely with a small, senior team. - Build, maintain, and extend full-stack features for an AI-powered product, primarily using Django and Python. - Develop lightweight frontend interfaces using HTMX, Alpine. js, and Tailwind CSS. - Integrate third-party APIs, AI services, and large language model providers, including OpenAI, Anthropic, and OpenRouter. - Connect marketing data sources and incorporate relevant data into product functionality. - Write clean, reliable, maintainable Python code and contribute to a well-structured, evolving codebase. - Apply modern AI-assisted development tools and workflows to accelerate implementation while maintaining strong engineering standards.

- Manage your workload independently, communicate progress clearly, and collaborate effectively with a remote team. - Contribute technical insights, suggest improvements, and help shape product development decisions. - Support the continued evolution of the platform by delivering features aligned with its roadmap and user needs. Requirements: You are an experienced full-stack developer who combines strong Python and Django expertise with practical experience building AI-powered applications. You are comfortable working autonomously, using modern development tools, and contributing ideas in a collaborative environment. - At least five years of hands-on full-stack development experience, preferably with Django as your primary framework. - Strong Python programming skills and a proven track record of building and shipping production-ready products. - Experience developing AI-powered applications using technologies such as LangChain, LangSmith, OpenAI APIs, OpenRouter, or Anthropic APIs. - Familiarity with Docker and confident use of Git for version control and collaborative development. - A balanced approach to software development that combines sound engineering fundamentals with modern AI-assisted workflows. - Practical experience or familiarity with AI development tools such as Cursor, Codex, and Claude Code, with the ability to explain how you use them in your daily work. - Strong written and spoken English, as English is the primary working language. - The ability to work independently, manage priorities, communicate clearly, and contribute ideas proactively. - Experience with Google Cloud Platform (GCP), Azure, CI/CD, or DevOps pipelines is a plus. - Frontend development skills and a strong eye for UI design and user experience are advantageous.