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Senior Full Stack AI Native Developer

4 weeks ago
Spain
Full-time
Senior
AI Engineer
Software Development
Express.js GCP JavaScript LLM Machine Learning Next.js Node.js PostgreSQL Python React REST API TypeScript
Apply Now
Leadtech

Leadtech

Leadtech is a Barcelona-based Online Innovation Technology company that has rapidly grown since 2007, becoming an industry leader in online project management with a global team of over 570 professionals.

IT Services
251-1K
Founded 2009
View All Jobs 18

Description

  • Design, implement, and maintain RESTful APIs using Next.js and Express for authentication, data processing, and analysis workflows.
  • Build AI agents and multi-step workflows using Model Context Protocol, Claude SDK, LangGraph, and LangFuse.
  • Develop and maintain features across the React frontend and Node.js/Next.js backend.
  • Create intuitive user interfaces in TypeScript, Vite, React, and the company UI component library.
  • Enable users to upload media, manage analyses, and interact with the web product.
  • Integrate the platform with external services, including payment providers and third-party APIs.
  • Handle incoming webhooks and asynchronous processing tasks.
  • Collaborate with AI product managers and AI specialists to translate requirements into scalable features and AI design prompts.
  • Contribute to PostgreSQL and BigQuery schema design and write database migrations.
  • Collaborate on deployment and maintain cloud infrastructure on Google Cloud Platform.

Requirements

  • Extensive experience with JavaScript/TypeScript.
  • Highly proficient in TypeScript for both frontend and backend development.
  • Strong experience with React, including Hooks and the Context API.
  • Solid experience building and consuming REST APIs with Node.js and Next.js or Express.
  • Experience with PostgreSQL and working with an ORM or query builder.
  • Experience integrating with third-party vendors and multiple SDKs.
  • Knowledge of LangGraph, LangChain, and LangFuse.
  • Ability to learn new tools and platforms very quickly and adapt them into daily workflow.
  • Proactive, collaborative problem-solving mindset with high autonomy.
  • Passion for AI and building products that use LLMs to solve real-world problems.
  • Nice-to-have experience with AI, machine learning, or LLM-based projects.
  • Nice-to-have familiarity with UI component libraries.
  • Nice-to-have knowledge of Google Cloud Platform (GCP).

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.
  • Flexible vacation policy with no blackout days.
  • Flexible schedule with flextime and the option to work fully remote or from the Barcelona office.
  • Free Friday afternoons with a 7-hour workday and a 35-hour workweek in July and August.
  • Annual budget for external learning opportunities and personalized internal training.
  • Office perks including free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with Mediterranean views.
  • Ticket restaurant and nursery vouchers paid directly from gross salary.

Interested in this position?

Apply directly on the company website

Apply Now

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