Data Scientist with ML (f/m/x)

Our requirements

• Minimum 5 years of experience as a Data Scientist
• Strong proficiency in SQL – ability to write complex queries, join large datasets, and prepare data for modeling
• Proficiency in Python (libraries such as pandas, numpy, scikit-learn, statsmodels, or similar) – focus on data analysis, modeling, and result validation
• Experience working with large datasets and ETL processes
• Ability to work with business data and interpret analytical results
• Attention to code quality and reproducibility of analyses
• Ability to communicate effectively in English in an international environment

Optional

• Expertise in the marketing and consumer analytics domain
• Good understanding of segmentation models (clustering, scoring, customer profiling) and predictive models (propensity, churn, LTV)
• Basic knowledge of model validation and performance metrics (AUC, lift, confusion matrix)

Your responsibilities

• Build and optimize predictive models (e.g., churn, propensity, segmentation, CLV, recommendations)
• Analyze consumer and marketing data across multiple sources
• Model and optimize customer journeys using AI/ML techniques
• Collaborate with marketing and product teams to define analytical priorities
• Translate complex analytical findings into clear business recommendations
• Deliver analytical outputs together with actionable usage guidance for business teams
• Prepare high-quality presentations, reports, and data visualizations for non-technical stakeholders
• Track model performance and measure business impact on marketing KPIs and P&L
• Identify new opportunities for data-driven growth and champion data-based decision-making across the organization

About the project

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People

Recruitment stages

• 1.
  Send your CV
• 2.
  Talk to us about your expectations
• 3.
  Learn more about our projects and choose the best
• 4.
  Start your adventure with Sii!

Sii Sp. z o.o.