Mindrift is looking for skilled Full-Stack Web App Developers (JavaScript/TypeScript + Python or Node) to join the Tendem project ( ) and build interactive browser-based applications for real-world use cases.

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In this role, you'll apply your full-stack engineering expertise to design, build, and maintain functional, robust, and user-friendly web applications. This part-time remote opportunity is adecuado for professionals with hands-on experience in modern frontend frameworks, backend APIs, databases, and shipping interactive web products end-to-end.

What We Do

The Mindrift platform connects specialists with innovative technology projects. Our mission is to help develop high-quality AI technologies by combining real-world expertise from professionals across the globe with advanced AI development efforts.

About the Role

This is a freelance role for a Tendem project. As a Full-Stack Web App Developer, you'll design, build,



and refine browser-based applications with real logic, state, persistence, and user input — from habit trackers and budgeting tools to internal dashboards, mini-SaaS tools, and AI-powered apps. You may also work on standalone Python applications and data-processing scripts that sit alongside or behind these products.

Key Responsibilities
- Build interactive web applications with frontend (React, Next.js, Vue, or similar) and a backend API (Python/FastAPI/Flask or Node/Express).
- Design and implement data models, schemas, and persistence layers using SQL (PostgreSQL, SQLite) or NoSQL stores.
- Implement authentication, sessions, and basic role-based access where needed.
- Integrate third-party APIs and AI/LLM services (OpenAI, Anthropic, or similar) into product features.
- Handle state management, user input validation, error states, and loading states cleanly.
- Build standalone Python tools and scripts where required by th

📌 Freelance Full-Stack Web App Developer (España)
🏢 Mindrift
📍 España