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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Full Stack AI Native Developer - **Company:** Leadtech - **Location:** Barcelona, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, BigQuery, Cloud Computing, Databases, Database Applications, Database Schema, Design of User Interfaces, Python (Programming Language), PostgreSQL, Machine Learning, Node.Js, Payment Service Provider, Software Product Management, Next.js, Software Deployment, Software Engineering, TypeScript, Data Processing, Google Cloud, ReactJS, Large Language Models, Backend, Webpack, Material UI, Real Time Data, Front End Software Development, React Redux, Restful APIs, Webhooks - **Published:** July 22, 2026 - **Apply:** https://es.indeed.com/viewjob?jk=62c91f2af6d2c948 ## About the Role We are seeking a proactive and skilled developer who is passionate about building modern, data-driven applications. * Extensive experience with the Python framework * Deep API Integration experience with 3rd Party vendors. Being able to work with multiple types of SDK to integrate into our products quickly. * A serious self-learner and someone that adapts to new tools and platforms very quickly and adapts it into their day to day workflow in days. * TypeScript Proficiency: You are highly proficient in TypeScript and its application in both frontend (React) and backend (Node.js) environments. * Frontend Expertise: Strong experience with React and modern state management, including Hooks and the Context API. * Backend Expertise: Solid experience building and consuming REST APIs with Node.js and NextJS or Express. * Database Skills: Experience with like PostgreSQL, and working with an ORM or query builder. * Knowledge of LangGraph, LangChain, LangFuse, * Problem-Solving Mindset: You are a collaborative problem-solver, eager to take on new challenges and contribute to a fast-paced development cycle. * Passion for AI: A genuine passion and awareness for artificial intelligence and a strong desire to build products that leverage its capabilities to solve real-world problems. and bring those new discoveries to our product Portfolio. * Very High Agency: in consultation with a Product Owner and the Engineering Manager, you must work with autonomy with a large degree of freedom to implement the business vision. * Creativity and Proactivity: You have a passion for building great products, are eager to propose new features, and enjoy finding creative solutions to improve the user experience., * AI Project Experience: Previous experience working on projects involving AI, machine learning, or interacting with large language models (LLMs). * Familiarity with UI component libraries. * Knowledge of cloud platforms like Google Cloud Platform (GCP). ## Description As part of the Development team as a Full-Stack Developer, you will be instrumental in building and scaling our platforms and products. You will work across our entire A.I technology stack to deliver a seamless and powerful user experience. You will be joining projects with a shipping fast approach and a modern tech stack. * Extensive knowledge of Javascript/Typescript. * Design, implement, and maintain RESTful APIs with NextJS/Express to manage user authentication, data processing, and orchestrate analysis workflows * Model Context Protocol (MCP) Knowledge Agents with Claude SDK: to Build AI agents access to real-time data, APIs, and tools Create AI Agents that can actually take actions, Combine the reasoning power of LLMs with real-world integration * Build AI Agents with LangGraph + LangFuse that can handle multi-step reasoning, Create workflows where AI agents collaborate or hand off tasks to other agents. Maintain conversation state and context across interactions and Handle complex decision trees and conditional logic * Develop and maintain features on both our React frontend and Node.js (NextJS) backend. * Build intuitive user interfaces using TypeScript, Vite, React and our UI component library, enabling users to upload media, manage their analyses, and interact with our web delivered product. * Integrate our platform with various external services like Payment Service Providers and APIs, and handle incoming webhooks for processing asynchronous tasks * Collaborate closely with AI product managers and AI specialists to translate complex requirements into robust, scalable features expressed in AI design prompts. * Contribute to database schema design and write migrations for our PostgreSQL & BigQuery databases. * Knowledge of GCP to Collaborate with the team on application deployment and help maintain our cloud infrastructure on Google Cloud Platform. ## Related Videos - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Micro Frontends with Module Federation: Why and How?](https://www.wearedevelopers.com/videos/165-micro-frontends-with-module-federation-why-and-how) - [Hiring AI Native Talents](https://www.wearedevelopers.com/videos/100268-hiring-ai-native-talents) - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) ## Related Articles - [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Dev Digest 132 - Binging WADFlix?](https://www.wearedevelopers.com/magazine/473-dev-digest-132-binging-wadflix)