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Senior Full Stack AI Native Developer

Leadtech Group🌍 Remote WorldwideEstimated: $80,000 - $120,000

Full-Stack Developer (AI Focus)

About the Role

Join our Development team as a Full-Stack Developer and play a key role in building and scaling our platforms and products. You will work across our entire AI technology stack to deliver a seamless and powerful user experience, contributing to projects with a fast-shipping approach and a modern tech stack.

Key Responsibilities

  • Design, implement, and maintain RESTful APIs with NextJS/Express for user authentication, data processing, and analysis workflows.
  • Build AI agents using Model Context Protocol (MCP) with Claude SDK to access real-time data, APIs, and tools, enabling agents to take actions and combine LLM reasoning with real-world integration.
  • Develop AI agents with LangGraph + LangFuse to handle multi-step reasoning, agent collaboration, task handoffs, conversation state management, and complex decision trees.
  • 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 for media uploads, analysis management, and product interaction.
  • Integrate our platform with external services (e.g., Payment Service Providers, APIs) and handle incoming webhooks for asynchronous tasks.
  • Collaborate closely with AI product managers and specialists to translate complex requirements into robust features using AI design prompts.
  • Contribute to database schema design and write migrations for PostgreSQL & BigQuery databases.
  • Collaborate on application deployment and assist in maintaining our cloud infrastructure on Google Cloud Platform (GCP).

What You Bring

  • Extensive knowledge of Javascript/Typescript.
  • Extensive experience with the Python framework.
  • Deep API Integration experience with 3rd party vendors and various SDKs.
  • TypeScript Proficiency in both frontend (React) and backend (Node.js) environments.
  • Frontend Expertise: Strong experience with React, modern state management (Hooks, Context API).
  • Backend Expertise: Solid experience building and consuming REST APIs with Node.js, 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 and eager to tackle new challenges in a fast-paced environment.
  • Passion for AI: Genuine passion for artificial intelligence and a desire to build products leveraging its capabilities.
  • Very High Agency: Ability to work with autonomy and freedom to implement business vision in consultation with Product Owner and Engineering Manager.
  • Creativity and Proactivity: Passion for building great products, proposing new features, and improving user experience.

Nice to Have

  • AI Project Experience (ML, LLMs).
  • Familiarity with UI component libraries.
  • Knowledge of cloud platforms like Google Cloud Platform (GCP).

Why You’ll Love Working With Us

  • High-Impact Role: Key player in a small, agile team building a greenfield project.
  • Modern Technology: Work with a cutting-edge tech stack and best practices.
  • Growth & Learning: Gain deep experience in AI-driven applications, cloud-native architecture, and real-time systems.
  • Stability & Vision: Startup energy backed by a large, successful company.
  • Collaborative Culture: Open communication, teamwork, and passion for building exceptional products.
  • Growth and Career Development: Flexible career path, personalized internal training, and an annual budget for external learning.
  • Work-Life Balance: Flexible schedule, flextime, option for full remote or office work, free Friday afternoons, and a 35-hour workweek in July/August.
  • Comprehensive Benefits: Competitive salary, full-time permanent contract, top-tier private health insurance (including dental and psychological services), 25 days of vacation plus your birthday off, and flexible vacation options.
  • Unique Perks (Office): Free coffee, fresh fruit, snacks, game room, rooftop terrace, ticket restaurant, and nursery vouchers.

Location

  • Flexible: Fully remote, hybrid, or in-office at our Barcelona office.

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Job Overview

Posted6/4/2026
CategoryAI & Machine Learning
SourceJobsCollider

FAQ

Is this position remote?

The Senior Full Stack AI Native Developer role is a remote opportunity. The location specified is Remote Worldwide.

What is the salary?

The salary is not explicitly stated, but is competitive and based on experience.

How do I apply?

You can apply by clicking the "Apply for this role" button above to submit your application on the hiring website.

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