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Full Stack Web Developer (Backend Focus) – Multi-cloud GenAI Platform / Secure GPT

On-site in Barcelona·Full-time·Added 4 months ago (last checked 9 Oct)

Pasiona

38 open roles

Overview

Work mode
On-site, Barcelona
Contract
Permanent contract, full-time hours
English
Required
Experience
5+ years
Benefits
Private health insurance

Visa options

  • The ad doesn’t mention sponsorship

    Not a refusal, but not a yes. Worth asking in your first message.

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Skills

This job advert was originally written in Spanish.

Requirements

What we're looking for

  • 5+ years of experience in backend web development (ideally in Azure or cloud environments).
  • Node.js (backend) and React / Next.js (light frontend).
  • Design and implementation of REST/GraphQL APIs.
  • Full testing experience:
    • Unit testing.
    • End-to-end (E2E) testing.
  • Azure:
    • App Services.
    • Cosmos DB.
    • Application Insights.
    • Observability and monitoring.
  • CI/CD with Azure DevOps.
  • Knowledge of Infrastructure as Code (IaC).
  • Experience with AI APIs: OpenAI, Azure AI, Anthropic, or Gemini.
  • Knowledge of:
    • RAG (Retrieval-Augmented Generation).
    • Agents / agentic frameworks.
  • Experience in prompt engineering (design, iteration, and optimization of prompts).
  • Autonomous mindset: end-to-end ownership of features.
  • Proactive, solution-oriented approach.
  • Ability to work in fast-changing environments.
  • Good communication skills in English (minimum B1).
  • Teamwork in international contexts.

Languages

  • Languages: Spanish and English.

Pay & benefits

What you'll get

¡One day off for your birthday so you can celebrate it however you want!

Improved paid leave for a better personal and professional balance.

Access to private health insurance for your peace of mind.

Extra vacation days based on your seniority, because we value your rest and well-being.

The role

We are looking for a Full Stack Web Developer with a strong backend focus to join the product team developing a Multi-cloud GenAI platform (Azure, AWS, Google Cloud), with the main focus on the Secure GPT service.

This is a key technical role in an international environment, where you will contribute to the design, development, and evolution of advanced generative AI capabilities, ensuring security, scalability, and regulatory compliance.

What you'll do

  • Design, develop, and improve features of the Secure GPT service (RAG, agents, document understanding, translation, APIs, automation).
  • Participate in the entire development lifecycle: analysis, technical design, implementation, testing, documentation, and monitoring.
  • Build and maintain robust and scalable APIs.
  • Define and monitor KPIs for product usage and performance.
  • Develop automations and efficiency improvements for the platform.
  • Collaborate with the Tech Lead and Product Owner in an international team.
  • Ensure compliance with security, compliance, and corporate architecture standards.

How you'll work

  • Location: Barcelona.
  • Occasional travel: France, Spain, or Portugal.

About Pasiona

Pasiona is a technology consulting firm specializing in cybersecurity, cloud infrastructure, and digital transformation. The company operates as a strategic partner for enterprises, offering services that range from vulnerability management and penetration testing to AI-driven platform engineering and data integration. With a global footprint, Pasiona combines deep technical expertise with a strong focus on innovation, helping organizations modernize their IT environments and secure their digital assets.

In Spain, Pasiona has established a significant presence in Barcelona, where it runs its Spanish operations and serves as a hub for international talent. The company is known for its collaborative, engineering-driven culture and actively recruits international professionals, offering opportunities for growth in areas like AI, cloud security, and platform engineering. For international hires, Pasiona provides a multicultural environment and the chance to work on cutting-edge projects, making it an attractive destination for those looking to build a career in Spain's thriving tech sector.

Industry
Tech Consulting
Founded
2010
Employees
100–500
Headquarters
Barcelona, Spain
In Spain
Barcelona

Good to know if you are moving

  • Pasiona is headquartered in Barcelona, so international hires would be joining the company at its global HQ.
  • The company's working language is English, making it accessible for non-Spanish speakers.
  • Pasiona offers visa sponsorship and relocation support for international candidates.
  • The company has a strong focus on professional development and certifications in cybersecurity and cloud technologies.
  • Barcelona offers a high quality of life, with a strong tech ecosystem and international community.

In their own words

Additional information

At Pasiona we are committed to diversity and equal opportunities.

We encourage everyone to apply, regardless of gender, age, disability, sexual orientation, gender identity, ethnic origin, religion, or any other personal or social circumstance.

All open roles at Pasiona

Location

Pasiona · Barcelona

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