Senior Data Scientist: Predictive Modeling & Growth

Sii Poland; Poznań; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Regular integration events and trips

Comfortable and well-equipped offices

Job summary

Sii Poland is seeking an experienced Data Scientist to join a newly formed analytics team. You will build predictive models, analyze consumer data, and translate analytics into business actions that improve marketing performance.

Strong SQL and Python skills, plus English, are essential in an international setting. You will collaborate with marketing and product teams, deliver dashboards and insights, and continuously track model impact on KPIs and P&Ls.

Qualifications

• 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 (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.

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

Skills

SQL

Python

ETL

Data interpretation

English communication

Job description

Sii Poland is seeking an experienced Data Scientist to join a newly formed analytics team. You will build predictive models, analyze consumer data, and translate analytics into business actions that improve marketing performance.

Strong SQL and Python skills, plus English, are essential in an international setting. You will collaborate with marketing and product teams, deliver dashboards and insights, and continuously track model impact on KPIs and P&Ls.