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AI Full Stack Developer

1 month, 1 week ago
Spain
Full-time
Mid Level
AI Engineer
Software Development
Express.js Fastify GCP NestJS Next.js Node.js PostgreSQL Prisma React REST API Tailwind CSS 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

  • Own features end-to-end across the Next.js frontend and NestJS backend services.
  • Develop and maintain frontend features using TypeScript, SWR, Tailwind, and a component-driven design system.
  • Build RESTful APIs for authentication, data processing, billing, usage tracking, and AI workflow orchestration.
  • Own backend services from schema design and migrations through deployment and observability.
  • Integrate and maintain third-party SDKs and APIs for payments, authentication, analytics, and messaging.
  • Build AI agents and tools using the Claude SDK and Model Context Protocol (MCP).
  • Design and maintain Prisma and PostgreSQL data models, including safe schema evolution and migrations.
  • Implement feature flags, A/B experiments, and analytics events to support data-driven product decisions.
  • Handle webhooks and asynchronous task processing with strong reliability for payment-critical and PII-handling flows.
  • Collaborate with AI product managers and specialists to turn complex requirements into scalable features and help maintain cloud infrastructure.

Requirements

  • Highly proficient in TypeScript across both frontend and backend environments.
  • Strong experience with React and Next.js App Router, including Server Components, route handlers, streaming, metadata, i18n, and modern data-fetching patterns.
  • Solid experience building production REST APIs with NestJS or comparable Node frameworks such as Express or Fastify.
  • Experience with PostgreSQL and an ORM such as Prisma, including schema design, migrations, and transaction reasoning.
  • Real experience integrating third-party SDKs, including webhooks, idempotency, retries, and asynchronous fulfillment.
  • Collaborative, pragmatic problem-solving mindset with willingness to challenge assumptions and discuss tradeoffs.
  • Genuine enthusiasm for AI products and a proactive approach to bringing in new techniques and tools.
  • Creative, self-directed, and able to propose features and improve user experience without being asked.
  • Ability to learn new tools and platforms quickly, adapting in days rather than weeks.
  • Nice to have: experience with payment or subscription systems, monorepo tooling, BigQuery, Tailwind, feature-flag systems, GCP, or AI/LLM-powered products.

Benefits

  • Competitive salary with a full-time permanent contract.
  • Top-tier private health insurance, including dental and psychological services.
  • Flexible work arrangement with full remote, hybrid, or Barcelona office options.
  • Flexible schedule with flextime, free Friday afternoons, and a 7-hour workday.
  • 35-hour workweek in July and August.
  • 25 days of vacation plus your birthday off, with flexible vacation and no blackout days.
  • Annual budget for external learning opportunities and personalized internal training.
  • Office perks in Barcelona including free coffee, fruit, snacks, a game room, a rooftop terrace, and additional vouchers for meals and nursery support.

Interested in this position?

Apply directly on the company website

Apply Now

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