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justDice

Senior Data Scientist

justDice

Senior Data Scientist designing targeting models and optimizing bidding policies for mobile ad platform adjoe. Collaborating in a fast-paced programmatic data science team in Hamburg, Germany.

Posted 4/16/2026full-timeHamburg • 🇩🇪 GermanySeniorWebsite

Tech Stack

Tools & technologies
PythonSQL

About the role

Key responsibilities & impact
  • Design and implement sophisticated targeting models to understand user preferences.
  • Develop and optimize bidding policies using advanced optimization algorithms.
  • Create and implement meta-models that learn from user interactions.
  • Conduct rigorous A/B testing and experimentation to validate hypotheses.
  • Take end-to-end ownership of models within the modern ML stack, balancing speed-to-market with robust engineering principles.
  • Foster a collaborative environment with direct, constructive feedback.

Requirements

What you’ll need
  • 4+ years of professional experience in the Data Science field working in AdTech, mobile gaming, e-commerce, or a similar industry.
  • Track record of architecting and deploying machine learning solutions, with strong expertise in real-time large scale recommender systems and neural networks.
  • Excellent Python and SQL writing skills, with hands-on experience integrating models into automated training and deployment pipelines.
  • Strong foundation in mathematical concepts and ability to translate complex algorithms into clear, concise explanations for both technical and non-technical audiences.
  • Solutions-oriented with a balance of technical excellence and the need for velocity.

Benefits

Comp & perks
  • Regular feedback and our development program support your growth, helping you expand your skillset and achieve your career goals.
  • Need a visa? No problem.
  • Enjoy 30 vacation days, 3 weeks of remote work per year, and free access to an in-house gym with lots of different fitness classes and mental health support through our Employee Assistance Program (EAP).
  • Participate in regular team and company events, including hackathons and social gatherings.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools
machine learningoptimization algorithmsA/B testingPythonSQLrecommender systemsneural networksautomated trainingdeployment pipelinesmathematical concepts
Soft Skills
collaborative environmentconstructive feedbacksolutions-orientedtechnical excellencecommunication