Data Scientist

Easybrain is looking for a Data Scientist to join our Business Intelligence team. Our ML models run in production, powering LTV prediction and user acquisition optimization across a portfolio of games with billions of installs. Your focus will be on building new ML systems for ads monetization and game personalization from the ground up.
This is a hands-on, end-to-end role focused on improving business metrics. You will own your models from problem framing through research, production deployment, validation, and post-launch iteration.

Responsibilities:

- Researching and developing ads monetization optimization (floor pricing, ad load balancing) - an open research problem: from studying the underlying dynamics and simple heuristics to ML models and potentially RL;

- Predicting LTV and other key user metrics using large-scale behavioral data: improving forecast accuracy through new modeling approaches, data signals, and features;

- Building in-game personalization systems: difficulty and content management;

- Validating models through A/B tests in collaboration with the analytical team and bringing them to production.
Tech stack: Python - you’re free to choose whatever ML tools fit the task best (PyTorch and LightGBM are in production today); ClickHouse, PostgreSQL, Airflow, MLflow, Docker.

Requirements:

- Experience in predictive modelling and deploying ML models to production: framing an open problem, exploring the data, building baselines, and iterating towards an ML solution;

- Strong knowledge of Python and hands-on experience with the modern ML stack;

- Profound understanding of statistics and machine learning;

- Experience in reinforcement learning, recommender systems, ad tech, or mobile games is a plus;

- B2+ level of English;

- Fluent Russian is required.
Benefits:

Besides the engaging tasks, support from experienced colleagues, challenge, and drive, we offer:

- Full support in relocating to countries where our offices are located;

- High-end market salary with performance bonuses;

- All needed equipment;

- Regular company events and monthly Friday meetings;

- Social benefits (private medical cover, sports reimbursement, etc.);

- Paid vacations, sick days;

- English, Greek, and Polish online language classes;

- Reimbursement for education and professional development.