Job DescriptionOur customer is a product company with a truly general presence, specializing in mobile app monetization. They provide a platform that helps developers grow their businesses through intelligent mediation and cutting-edge data tools. The team is composed of international professionals dedicated to building history-defining solutions for the mobile industry.

Location: Barcelona, Spain

Contract: Full-Time

Working location: On-Site

What You'll Drive

Optimize Ad Efficiency: Design and deploy end-to-end models that directly improve ad targeting, bid strategies, and campaign ROI

Scale Intelligent Systems: Develop high-performance data science solutions from initial analysis through to production-ready deployment

Uncover Trends: Independently analyze massive datasets to identify patterns that drive business decisions and product innovation

Enhance Pipelines: Maintain and optimize existing ML models and data pipelines to ensure efficiency within the fast-moving ad-tech ecosystem

Bridge Tech and Business: Translate complex technical requirements into data-driven insights that non-technical stakeholders can act upon

Who You Are

AdTech Expert: You bring 2+ years of experience specifically within the ad-tech domain or a closely related field.

Experienced Engineer: You have 3+ years of professional experience in data science, ideally within a product-focused company.

Python & SQL Specialist: You are highly proficient in Python and SQL, with hands-on experience using PySpark and Pandas.

ML Practitioner: You have a proven track record of training DNN models using PyTorch and managing workflows with Hydra or Comet.

Cloud Native:



You are comfortable working with AWS cloud services to deploy and manage data solutions.

How You'll WorkYou will be an integral part of the Data Science team in Barcelona, working in a cross-functional environment alongside both technical and business teams. This role requires a balance of independent problem-solving and deep collaboration to ensure models align with dynamic market trends.

Decisions are data-driven, and you will have the autonomy to own your projects from development to deployment. While the company supports remote collaboration globally, this specific role is based in the city-center office in Barcelona to foster close-knit team innovation.

What You'll Get

Career Growth: Professional development opportunities and a clear path for advancement within a fast-growing environment

Work-Life Balance: Flexible work arrangements and a culture that respects personal time

Relocation Support: Assistance with relocating to a vibrant hub in Barcelona

Impactful Projects: The chance to work on high-stakes ML projects that influence the global mobile ecosystem

What Happens Next

Screening call with an All The Hires team member to ensure general fit, motivation, and availability

Internal HR Screen: An initial conversation to discuss your background and expectations with a member of the customer's recruiting team

Technical Interview (Coding & ML Fundamentals): A 60-minute deep dive into your core technical skills

Technical Interview (System Design): A 60-minute session focused on architectural and scalable thinking

Bar Raiser / Hiring Manager Stage: A final 30–45 minute conversation to discuss mission alignment and culture fit

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📌 Data Scientist / ML Engineer (Madrid)
🏢 All The Hires
📍 Madrid