[Hiring] Senior Full Stack AI Native Developer @leadtech

Role 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:
  • 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.
  • 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.

Qualifications

• Extensive experience with the Python framework.
• Deep API Integration experience with 3rd Party vendors.
• A serious self-learner and someone that adapts to new tools and platforms very quickly.
• TypeScript Proficiency: 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 PostgreSQL, and working with an ORM or query builder.
• Knowledge of LangGraph, LangChain, LangFuse.
• Problem-Solving Mindset: Collaborative problem-solver, eager to take on new challenges.
• Passion for AI: Genuine passion and awareness for artificial intelligence.
• Very High Agency: Work with autonomy with a large degree of freedom to implement the business vision.
• Creativity and Proactivity: Passion for building great products and proposing new features.

Requirements

• 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).

Benefits

• High-Impact Role: Be a key player in a small, agile team building a greenfield project.
• Modern Technology: Work with a cutting-edge tech stack with a focus on best practices.
• Growth & Learning: Gain deep experience in AI-driven applications, cloud-native architecture, and real-time systems.
• Stability & Vision: Enjoy the energy of a startup environment backed by a large, successful company.
• Collaborative Culture: Value open communication, teamwork, and a shared passion for building exceptional products.
• Growth and career development: Flexible career path with personalized internal training and an annual budget for external learning opportunities.
• Work-Life balance: Flexible schedule with flextime and the option of working fully remote or from our Barcelona office.
• Comprehensive benefits: Competitive salary, full-time permanent contract, and top-tier private health insurance.
• 25 days of vacation plus your birthday off, with flexible vacation options.
• Unique Perks: Office in Barcelona with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace.