Senior Data Scientist (Marketing DSA)

Location: Vilnius or Kaunas, Lithuania. Hybrid work; 2 days in the office are recommended but not enforced, with exact days agreed with the team.

Gross monthly salary: €4,608–€6,233.

Company

hirify.global is a second-hand marketplace connecting millions of members across more than 20 markets, with additional shipping and payment businesses within the hirify.global Group.

What you will do

• Code, calibrate, and scale Bayesian Media Mix Models and ROI frameworks for marketing measurement.
• Build and maintain econometric and statistical models for marketing impact, GMV, and engagement.
• Design automated model validation frameworks and reliability metrics to monitor model health and accuracy.
• Develop automated data products, including self-healing MMM capabilities, using AI and automation.
• Partner with decision scientists and marketing leadership to connect model outputs with business decisions.
• Maintain high standards for code quality, rigorous validation, and reproducibility.

Requirements

• Hands-on data science experience focused on advanced statistical, econometric, or time-series modelling.
• Strong theoretical knowledge of advanced statistics, causal inference, and regression.
• Ability to read scientific papers, investigate state-of-the-art techniques, and replicate or adapt advanced methodologies.
• High proficiency in Python and experience building modular, reproducible, production-grade model pipelines and data products.
• Ability to connect technical model outputs with commercial metrics and business outcomes.
• Master’s or PhD degree in Statistics, Econometrics, Mathematics, Data Science, or a similar highly quantitative discipline.
• Ability to present confidently and facilitate strategic discussions with technical and leadership audiences.

Nice to have

• Experience in marketing measurement or Media Mix Modelling.
• Familiarity with probabilistic programming, such as PyMC.

Culture & Benefits

• Hybrid workplace model with flexible office days.
• 25 working days of holiday and private health insurance.
• Share options programme, home-office equipment, and up to €540 for home workplace furniture.
• Annual individual learning budget for courses, certifications, and workshops.
• Up to 90 days per year of workation, including up to 21 days outside the EU.
• Employee Assistance Program, team-building events, hirify.global shopping budget, and office-specific meals and facilities.