Junior Product Engineer – AI

Havas

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

Posted 9/24/2026full-timeMadrid • SpainJuniorWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in Python programming with experience in building applications and APIs using FastAPI or Flask. Familiar with AI technologies, API integration, and cloud deployment, with a strong emphasis on collaboration and effective communication in a team environment.

Highest-signal resume keywords

Python ProgrammingFastAPI Application DevelopmentAPI IntegrationGoogle Cloud DeploymentCollaboration in Multicultural Teams

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

PythonFastAPIFlaskAPIsSoftware Development PrinciplesData StructuresGitDockerAI/ML ProjectsAPI Testing

Soft Skills

Problem-Solving MindsetAttention to DetailStrong Communication SkillsEagerness to LearnCollaborative Work Style

Tools & Technologies

Google CloudAWSAzurePostmanCurl

Industry Keywords

AI TechnologiesAdvertising TechnologyDigital Marketing

Tech Stack

Tools & technologies

AWSAzureCloudDockerFlaskPython

About the role

Key responsibilities & impact

Support 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 implement user-facing features
Assist with integrating LLM APIs, including Gemini and GPT, for audience insights and content generation
Help connect external advertising APIs such as Meta, Google Ads, TikTok, and Amazon Ads
Learn and apply prompt engineering techniques to improve AI outputs
Deploy services to 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
Work with product managers, designers, and data scientists
Participate in code reviews and learn from senior engineers
Document work and communicate progress effectively

Requirements

What you’ll need

Bachelor's degree in Computer Science, Data Science, Engineering, or related field (or equivalent practical experience)
0-1 years of professional experience or strong internship/project portfolio
Good working knowledge in English
Basic Python programming skills; familiarity with 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
Exposure to cloud platforms (Google Cloud, AWS, or Azure) is nice to have
Experience with AI/ML projects is nice to have
Basic understanding of Docker or containerization concepts is nice to have
Interest in advertising technology or digital marketing is nice to have
Participation in coding bootcamps, hackathons, or open-source projects is nice to have
Familiarity with API testing tools (Postman, curl) is nice to have

Benefits

Comp & perks

Equal opportunities for all potential employees
Zero tolerance for discrimination
Welcomes applicants irrespective of age, sex, race, ethnicity, disability, and other factors unrelated to job performance