Senior Data Scientist (m/f/d)

Jobgether; España; Híbrido; EUR 80.000 - 105.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Home-office budget

Learning & development budget

Flexible remote work

Office relocation option

International team

Descripción de la vacante

Jobgether in Spain is seeking a Senior Data Scientist for a partner company to build and optimize machine-learning products at scale in the digital advertising space. You will manage the full data science lifecycle, from research to production deployment, collaborating with data scientists, analysts, and ML engineers to deliver measurable business impact.

You will work in an international, collaborative, experimentation-driven environment, focusing on practical and scalable ML solutions with

Formación

• 5+ years in data science or ML product development.
• Experience in Ad-Tech or programmatic advertising.
• Strong Python programming with clean, testable code.

Responsabilidades

• Develop ML models for large-scale ad systems.
• Improve models with new features and data sources.
• Collaborate with ML Engineers to deploy scalable algorithms.
• Explore data sources to boost model and product performance.
• Design and analyze A/B tests to measure impact.

Conocimientos

Python

Spark

Hadoop

Reinforcement learning

Machine learning

A/B testing

Data analysis

Herramientas

Docker

Airflow

Descripción del empleo

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Data Scientist (m/f/d) based in Spain.

This role offers the opportunity to build and improve machine-learning products operating at exceptional scale within the digital advertising ecosystem.
You will work with large, complex datasets and models processing billions of ad requests and users in real time.
The position spans the full data science lifecycle, from research and experimentation through production deployment and continuous optimization.
You will collaborate closely with data scientists, analysts, and machine learning engineers to develop scalable solutions with measurable business impact.
Your work will directly contribute to improving product performance, customer outcomes, and the efficiency of programmatic advertising systems.
The environment is international, highly collaborative, experimentation-driven, and focused on solving complex problems with practical machine learning.
This is an opportunity for an experienced data scientist to work on challenging problems while having meaningful technical and commercial impact.

• Develop, improve, and maintain machine-learning models used within large-scale programmatic advertising systems.
• Enhance existing models by introducing new features, tuning parameters, and incorporating additional data sources.
• Collaborate with Machine Learning Engineers to research, develop, and deploy scalable supervised and unsupervised learning algorithms.
• Explore new and existing data sources to identify opportunities for improving models and product performance.
• Research and evaluate machine-learning approaches that can optimize different stages of the business and technology value chain.
• Design, run, and analyze A/B tests to validate hypotheses, measure impact, and guide product and modeling decisions.
• Develop solutions capable of handling sparse, large-scale datasets for prediction, clustering, outlier detection, and related use cases.
• Contribute to neural-network-based products for classification, regression, multi-task learning, and other relevant applications.
• Build clean, reproducible, well-tested code suitable for production environments.
• Develop and improve monitoring solutions, dashboards, and data-driven tools to track model and system performance.
• Work closely with analysts, engineers, and other data scientists to communicate findings and translate research into practical solutions.
• Maintain a strong focus on simplicity, experimentation, measurable impact, and solutions that address real business problems.

Requirements:

• Minimum 5 years of professional experience developing data science or machine-learning products, ideally covering the full lifecycle from research through production deployment.
• Previous professional experience in Ad-Tech is required, with relevant exposure to programmatic advertising or mobile advertising technologies.
• Strong programming skills, particularly in Python, with a focus on clean, reproducible, maintainable, and well-tested code.
• Practical experience with technologies such as Spark, Hadoop, Airflow, Docker, and SQL.
• Hands-on experience developing algorithms for sparse and large-scale datasets, including prediction, clustering, and outlier detection.
• Experience building neural-network-based products for classification, regression, multi-task learning, or similar applications is highly valuable.
• Knowledge of reinforcement learning and large-scale optimization problems is an advantage.
• Strong SQL skills and a good understanding of dashboards and monitoring tools.
• Ability to work effectively with large datasets and complex machine-learning systems operating at scale.
• Strong analytical and problem-solving abilities, combined with a pragmatic approach to selecting appropriate solutions.
• Excellent communication and collaboration skills, with the ability to work effectively alongside data scientists, analysts, engineers, and other stakeholders.
• A strong experimentation mindset and willingness to continuously research, test, and refine new approaches.
• Ability to focus on tangible product and business outcomes rather than applying technology for its own sake.

Benefits:

• Direct collaboration with founders and the opportunity to make a visible impact.
• Strong opportunities for career development and continuous learning.
• Opportunity to work alongside experienced data scientists, engineers, entrepreneurs, and industry specialists.
• International and multicultural team distributed across Europe, Asia, North America, and other regions.
• Flexible work-from-home arrangement.
• Opportunity to relocate to an office in Berlin.
• USD $500 home-office setup budget.
• USD $1,000 annual learning and development budget.
• Opportunity to work on machine-learning systems processing massive datasets and real-time advertising workloads.
• Exposure to challenging data science problems across large-scale programmatic advertising and machine learning.

How Jobgether works:

We use an AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team.

We appreciate your interest and wish you the best!

Data Privacy Notice: By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time.