Senior Data Scientist

Macadam; Barcelona; Híbrido; EUR 70.000 - 110.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Wellness allowance

Hybrid working culture

Offices in Barcelona

Friday team lunch

Company events

Descripción de la vacante

Macadam is hiring a Senior Data Scientist in Barcelona to shape product and growth strategy through machine learning and advanced analytics. You will own problem definition, deployment, and impact measurement while collaborating with Product, Growth, Marketing, Engineering, and Analytics teams.

We seek 5+ years in data science, strong Python/SQL, and experience with BigQuery, GCP, dbt, and analytics tools. Barcelona-based with a hybrid work culture and international collaboration.

Formación

• 5+ years of experience in Data Science, ML, or related fields.
• Proficiency in Python and SQL, and experience with production ML workflows.

Responsabilidades

• Identify and lead data science opportunities to improve growth, engagement, retention, revenue.
• Build models for personalization, recommendations, segmentation, and forecasting.
• Design experiments using A/B testing and causal inference; deploy models to production.
• Define success metrics and communicate impact to stakeholders.
• Collaborate with Product, Growth, Engineering, and Analytics teams.

Conocimientos

Python

SQL

Data Science

Machine Learning

A/B testing

Educación

Bachelor's or Master’s in CS/Math/Stats

Herramientas

BigQuery

GCP

dbt

Mixpanel

Firebase Analytics

Descripción del empleo

At Macadam, we've built an app that rewards people for walking. With over 15 million users worldwide, we help individuals turn their daily steps into positive habits for health, wellbeing, and sustainability.

Our team is growing fast, and our ambitions are global. We operate at the intersection of health, gamification, and technology, and we're building a world-class data team to support this growth.

If you’re passionate about using data and machine learning to build products that improve lives at scale, we’d love to meet you.

THE ROLE

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.

RESPONSIBILITIES

• 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

WHAT YOU'LL BRING

• 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

NICE TO HAVE

• 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

WHAT'S IN IT FOR YOU

• 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.
• Wellness allowance (powered by Urban Sports).
• Hybrid working culture with international flexibility.
• Friday team lunch.
• Company events and offsites.

WHY MACADAM?

We don’t just talk about change - we walk it.

• Make it happen - take ownership, drive outcomes that matter.
• Build together, win together - support and challenge each other to go further.
• Trust the data - decide clearly, act confidently, measure what counts.
• Build for people - design with empathy, simplicity, real humans in mind.
• Think bigger - set the bar high, push boundaries, imagine better ways.