Kleinanzeigen reaches 36M+ monthly users and is Germany’s leading online classifieds market. We are a sustainability-focused platform where you won't just write code; you will power the services that bridge our high-traffic backend with seamless user experiences.

We are looking for an AI engineer proficient in Python, AWS, and GenAI frameworks to bridge the gap between business needs and production-grade solutions, while upholding high standards of software quality and AI ethics.

Job Requirements

As an experienced AI Engineer, you will:

- Understand user needs and business opportunities and identify where Artificial Intelligence (including GenAI) can bring the greatest impact.

- Design, build and deploy AI systems and agentic workflows.

- Contribute to the implementation of the AI strategy and roadmap for the company.

- Share your knowledge with your colleagues to boost artificial intelligence in Adevinta and strengthen our AI community.

Job Responsibilities

Main responsibilities will be

- Have experience applying machine learning methods (including deep learning) to:

- Develop solutions to address impactful business needs.

- Assure quality and robustness of AI system outputs.

- Work with other team members to help productionize end-to-end ML solutions.

- Experience in designing, building, and deploying intelligent AI agents and multi-agent systems using frameworks like LangGraph.

- Demonstrate a robust ethical framework and critical thinking skills when developing, implementing, or utilizing AI technologies.

- Experience in applying Generative AI technologies to solve business problems, while demonstrating a thorough understanding of its associated risks.

- Proficiency in Python with ability to translate ideas into prototypes.

- Experience working in cloud environment (e.g. AWS)

- Experience with Agile philosophies (e.g. Scrum) and project management tools (e.g.: JIRA).

- Have strong interpersonal communication skills to:

- Engage with stakeholders and understand business requirements.





- Communicate effectively with non-technical audiences.

- Stay current with the latest advancements in Artificial Intelligence.

Nice to Have

- Backend Engineering Background: Prior hands-on experience in software engineering and backend development (e.g., building robust APIs, microservices architecture, serverless systems, and managing database integrations like SQL/NoSQL or vector databases).

- System Design: Understanding of distributed systems, high-availability architecture, and design patterns that support performant production application infrastructure.

Job Benefits

At Kleinanzeigen, we care about our people — their wellbeing, growth, and life beyond work. Our benefits are designed to support you holistically, giving you flexibility and opportunities to thrive.

✨ Flexibility

- 26 business days of paid annual holidays

- 20 days “work from anywhere”

- Adaptable working time (hybrid)

- Paid additional parental leave for both parents

- Extra paid days off for special occasions (e.g. your wedding or a move)

❤️? Wellbeing & Support

- Private health insurance

- Gym Pass (may cover up to 70% of gym membership fees)

- 40€ per month as a remote working allowance.

? Growth & Development

- Learning opportunities to grow your skills and career
- A unique position in an international and dynamic environment
- A flat, collaborative culture where your feedback actively shapes our processes

?️ Perks & Everyday Benefits

- Competitive compensation package (Base salary + annual bonus)

- Flexible Remuneration Program (tax-efficient options for transport, restaurant vouchers and childcare)

- Corporate benefits and exclusive discounts
- An attractive referral program

Kleinanzeigen is an equal opportunity employer that values diversity and inclusion. We welcome people of all backgrounds, races, religions, colours, national origins, gender identities, sexual orientation, ages, marital status, or disability status.

If this role sparks your interest but you’re not sure you meet every single requirement, we’d still love to hear from you anyway!

📌 AI Engineer (Barcelona)
🏢 Adevinta
📍 Barcelona