Mid-Level Data Scientist – Machine Learning & Advertising Domains

Unleash innovation in digital advertising — shape the next generation of data-driven performance! Warsaw-based opportunity with fully remote work model. As a Senior Data Scientist – Machine Learning & Advertising Domains, you will be working for our client, a leader in digital advertising technology. You will play a crucial role in designing and refining advanced ML models for bidding, ranking, and content optimization that directly impact campaign success and platform efficiency. This is your chance to contribute to cutting-edge solutions in the high-stakes world of online advertising, driving measurable business results and technological breakthroughs. Your main responsibilities: • Design and optimize machine learning models targeting key performance metrics such as CTR, CVR, and RoAS, embedded in core bidding logic and performance strategies. • Architect complex models that fuse diverse data signals, including user, product, publisher, and placement features. • Fine-tune models to meet the demands of high-throughput, low-latency online environments. • Develop models for Dynamic Content Optimization within the DSP platform, including retargeting scenarios. • Collaborate across teams to ensure model deployment, monitoring, and continuous improvement follow industry best practices. • Write production-quality, tested, and well-documented Python code, leveraging CI/CD workflows and cloud infrastructure. You're ideal for this role if you have: • At least 3 years of experience in data science or related fields, with a focus on machine learning development and deployment. • Proficiency in Python, PyTorch or TensorFlow, Pandas, and NumPy. • Solid knowledge of SQL, preferably BigQuery or similar analytic SQL. • Extensive experience working with public cloud platforms, specifically Google Cloud Platform (Vertex AI, Pipelines). • Proven track record in designing and training deep neural networks in production environments. • Academic background or extensive professional experience in STEM fields such as Computer Science, Mathematics, or Physics. • Strong engineering skills, including writing reliable, testable, and documented code, with familiarity in CI/CD practices. It is a strong plus if you have: (optional)• Experience developing low-latency ML models for real-time applications in online advertising. • Background working within the advertising or marketing industry. • Experience in predictive modeling for business metrics like CTR and CVR. • Knowledge of Real-Time Bidding (RTB) algorithms and Demand Side Platforms. • Familiarity with traditional machine learning techniques such as Random Forests or Gradient Boosted Trees. • Practical experience using AI-assisted coding tools to boost productivity and code quality. Language Required for the role: • English — communicative proficiency (spoken and written). Eligibility for the role: • Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.