Senior Data Scientist

• 5+ years of experience in Data Science, Machine Learning, Applied Science, or a similar role

• Strong proficiency in Python and SQL

• Experience using BigQuery, GCP, dbt, and product analytics tools such as Mixpanel or Firebase Analytics

• Experience developing, deploying, and evaluating machine learning models

• Familiarity with data pipelines and production machine learning workflows

• Strong knowledge of statistical modeling, experimentation, and model evaluation

• Experience working with large behavioral, transactional, or product datasets

• Strong product and business mindset, with a focus on measurable outcomes

• Excellent communication and cross-functional collaboration skills

• Fluent in English

• Experience with consumer mobile apps, gaming, advertising, loyalty, or rewards products

• Experience with recommender systems, personalization, churn, LTV, or fraud models

• Experience with causal inference, uplift modeling, or large-scale experimentation

• Familiarity with mobile attribution frameworks, including Apple's SKAdNetwork

Please submit your CV in English.

• Be part of a mission-driven company making a tangible difference in people's lives, one step at a time.

• Real ownership: lead high-impact data science initiatives and build solutions used by millions from day one.

• Opportunities for professional growth, learning, and international exposure.

• A supportive, talented, and passionate international team.

• Offices in the heart of Barcelona.

• Meal voucher.

• Wellness allowance (powered by Urban Sports).

• Private healthcare (Alan).

• Hybrid working culture with international flexibility.

• 4 additional Macadam holiday days.

• Friday team lunch.

• Company events and offsites.

We are looking for a Senior Data Scientist to help shape Macadam's product and growth strategy through machine learning, experimentation, and advanced analytics.

You will work on high-impact topics such as personalization, user engagement, retention, monetization, fraud prevention, and reward economy optimization. This is a hands-on senior role with ownership from problem definition through deployment and impact measurement.

You will partner closely with Product, Growth, Marketing, Engineering, and Analytics teams to build data-driven solutions used by millions of users.

This role is based in Barcelona. We're looking for candidates who are already living in the city or ready to relocate.

• Identify and lead data science opportunities that improve growth, engagement, retention, revenue, and user experience

• Build machine learning models for personalization, recommendations, user behavior prediction, segmentation, and forecasting

• Develop solutions supporting churn prevention, lifetime value optimization, fraud detection, and Macadam's reward economy

• Design and analyze experiments using A/B testing, causal inference, and other advanced statistical methods

• Take models from initial exploration to production, working closely with Data and Engineering teams

• Define clear success metrics and evaluate solutions based on measurable product and business impact

• Communicate findings and recommendations clearly to technical and non-technical stakeholders

• Contribute to Macadam's data science roadmap, standards, and best practices