Data Scientist

20 hours ago

Belgrade Serbia AdTech Holding Full time €60,000 - €120,000 per year

AdTech Holding is an Innovation hub based in Cyprus, which creates vibrant startup ecosystems and technologies for AdTech & MarTech projects.

Since 2011, AdTech Holding has been a starting point for an array of industry-leading advertising and digital marketing companies (PropellerAds, Zeydoo etc). Holding brings the most daring ideas to the market and creates cutting-edge solutions to deliver technology globally.

We are looking for a Data Scientist to join our Research & Analytics Team.

We have a strong team with a rich culture of ML and AI technologies, developed over more than 10 years

About the Team

The Research & Analytics team at PropellerAds applies Machine Learning to build advertising recommendation algorithms (CTR Prediction, Ranking), optimize bidding in Real-Time Bidding, segment users, and assess traffic quality.

Our solutions handle billions of requests daily and impact the experience of hundreds of millions of users worldwide.

We work with Python, Airflow, Vertica, Amazon Sagemaker, PyTorch, and Docker.

What You'll Do

  • Develop ML models for recommendation systems and auction optimization.
  • Apply modern techniques such as Multi-Armed Bandits, Reinforcement Learning, and Counterfactual Learning.
  • Work across the entire ML pipeline — from data and feature engineering to production inference.
  • Collaborate closely with backend engineers, contribute to infrastructure design, and participate in A/B testing of models.
  • Monitor metrics and model performance after deployment.
  • Communicate with business stakeholders, analyze corner cases, and identify opportunities to improve the system together.

What We Expect

  • 3+ years of experience developing and deploying ML models in production.
  • Strong knowledge of classical Machine Learning algorithms.
  • Excellent skills in Python, pandas, and scikit-learn.
  • Solid understanding of probability theory, statistics, and basic Reinforcement Learning principles.
  • Ability to turn vague business problems into clear, structured tasks and suggest appropriate models or solutions.

Nice to Have

  • Experience in AdTech or Recommender Systems.
  • Experience working with SQL and large-scale data.
  • Knowledge of Airflow and Docker.
  • Familiarity with deep learning frameworks — PyTorch, TensorFlow, or JAX.
  • Ability to design solutions with latency and high-load considerations (highload ML).


We offer freedom of choice: with us, you'd have a cafeteria benefits system where you can choose which benefits would fit your individual needs.
And, of course, a standard pack of benefits as well: health insurance, fully covered 10 working days of sick leave per year, 5 additional day-offs per year, English and other languages compensation, quartile, and annual bonuses, corporate events, gifts, also food (yummy) - you can find snacks in our worldwide working spaces and breakfasts & lunches in the offices

Please not, that by applying to this position, you confirm your consent to the processing of your personal data for recruitment purposes.

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