Agency : Havas Media Group Spain

Job Description : We’re looking for a Junior Product Engineer to support the development of AI-powered features for HAVAS data products. You’ll work alongside senior engineers and product teams to build, test, and deploy backend services and API integrations. This is a hands-on role where you’ll learn to build scalable applications, integrate AI and advertising APIs, and contribute to production features for Converged Activate and Match.AI.

Main Responsibilities Product Engineering Support

Support the development of AI-driven features by implementing technical requirements under guidance

Build and maintain Python-based applications and APIs using FastAPI or Flask

Collaborate with senior engineers and product teams to understand and implement user-facing features

AI & API Integration

Assist with integrating LLM APIs (Gemini, GPT) for use cases like audience insights and content generation

Help connect external advertising APIs (Meta, Google Ads, TikTok, Amazon Ads)

Learn and apply prompt engineering techniques to improve AI outputs

Cloud Deployment & DevOps

Deploy services to cloud environments (Google Cloud Run) with support from senior team members

Participate in CI/CD processes and learn deployment best practices

Monitor application performance and troubleshoot issues

Learning & Collaboration

Work closely with cross-functional teams including product managers, designers, and data scientists

Participate in code reviews and learn from senior engineers

Document your work and communicate progress effectively

Education

Bachelor’s degree in Computer Science, Data Science, Engineering, or related field (or equivalent practical experience)

Previous Experience





0-1 years of professional experience or strong internship/project portfolio

Language Skills

Good working knowledge in English

Key Competencies

Basic Python programming skills (familiarity with frameworks like FastAPI or Flask is a plus)

Understanding of APIs and how to work with them

Foundational knowledge of software development principles and data structures

Eagerness to learn about LLM technologies and AI applications

Basic familiarity with Git and version control

Problem-solving mindset and attention to detail

Strong communication skills and ability to ask questions

Comfortable working in a collaborative, multicultural team environment

Nice to have:

Exposure to cloud platforms (Google Cloud, AWS, or Azure)

Any experience with AI/ML projects (coursework, personal projects, or internships)

Basic understanding of Docker or containerization concepts

Interest in advertising technology or digital marketing

Participation in coding bootcamps, hackathons, or open-source projects

Familiarity with API testing tools (Postman, curl)

What You’ll Learn

Production-grade Python development and API design

Working with cutting-edge LLM technologies in real business applications

Cloud deployment and DevOps practices

Advertising technology ecosystem and campaign automation

Agile product development workflows

Cross-functional collaboration in a integral organization

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Contract Type : Permanent

Here at Havas across the group we pride ourselves on being committed to offering equal opportunities to all potential employees and have zero tolerance for discrimination. We are an equal opportunity employer and welcome applicants irrespective of age, sex, race, ethnicity, disability and other factors that have no bearing on an individual’s ability to perform their job.

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📌 Junior Product Engineer - AI (Madrid)
🏢 Havas Group
📍 Madrid