Senior Data Scientist

The role

The Senior Data Scientist will build statistical and machine learning models to improve content discovery and user engagement. You will work with ML engineers to translate models and insights into production systems.

What you will do

• Build statistical and machine learning models to improve content discovery and user engagement
• Work closely with ML engineers to translate models and insights into production systems
• Apply analytical skills to dive deep into data to find key insights
• Apply causal inference methods to understand the impact of potential product changes
• Define and build new ML features using text and multimodal embeddings and GenAI
• Validate offline learnings with online outcomes through AB testing
• Design, execute, and analyze experiments to prove product change attribution

Required qualifications

• PhD or M.S. in Computer Science, Mathematics, Electrical Engineering, Statistics, Economics or Operations Research
• 5+ years of professional experience in data science, machine learning or related quantitative field
• 3+ years of professional experience with large-scale online ranking/recommender systems
• Deep expertise in statistical inference and experimental design: hypothesis testing, power/sample size calculations, variance reduction, etc.
• Proficiency in causal inference methods to measure product impact
• Proven ability to translate offline analysis into product decisions and measurable improvements in online metrics
• Fluency in the Python analytics stack (pandas, NumPy), statistical modeling (statsmodels or scikit-learn) and machine learning packages such as LightGBM and XGBoost
• Strong experience with SQL (e.g. postgres, snowflake, etc)

Nice to have

• Experience working on consumer-facing products with millions of users
• Hands-on experience with orchestration/transformation tools (e.g. dbt and Airflow)
• Experience with deep learning and being familiar with tools such as PyTorch or TensorFlow
• Hands-on development of products/tools incorporating GenAI, LLMs, RAG, and/or Agents

About the company

Haystack News is a destination for news on streaming platforms trusted by over 30 million viewers.