Data Scientist with ML (f/m/x)

Sii Poland; Kraków; On-site; PLN 150,000 - 210,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Medical care

Internal trainings

Job summary

Sii Poland seeks an experienced Data Scientist to join a newly formed analytics team in Kraków. You will build predictive models, analyze marketing data, and translate insights into actionable business decisions to influence consumer strategy.

Responsibilities include collaborating with marketing and product teams, delivering clear visualizations, and tracking model performance against KPIs. English proficiency is required in this international role.

Qualifications

• Minimum 5 years of experience as a Data Scientist.
• Strong proficiency in SQL and ability to write complex queries for modeling.
• Proficiency in Python (pandas, numpy, scikit-learn) for data analysis and validation.
• Experience with large datasets and ETL processes.
• Excellent English communication in an international environment.

Responsibilities

• Build and optimize predictive models (e.g., churn, CLV, segmentation).
• Analyze consumer and marketing data across multiple sources.
• Translate analytical findings into actionable business recommendations.
• Collaborate with marketing and product teams to set analytical priorities.
• Deliver outputs with usage guidance for business teams.

Skills

SQL

Python data analysis

ETL processes

English communication

Job description

We’re looking for an experienced Data Scientist skilled in building predictive models. You will join a newly formed analytics team inside a leading global company in the tobacco industry, shaping how data drives consumer strategy and marketing performance. Your work will focus on predictive modeling, consumer insights and translating analytics into actionable business decisions. If you want your models to truly ‘move the needle’, this role is for you.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications, competencies, and performance. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promote a diverse and inclusive work environment.

Your tasks

• 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

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

Nice to have

• 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)

Job no. JOB-N66KQ

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

Benefits For You

• Great Place to Work
• Solid financial situation
• Contracts with the biggest brands
• Centre of internal trainings
• Many experts you can learn from
• Open and accessible management team
• Profit sharing
• Passion Sponsorship program
• Regular integration events and trips
• Comfortable and well-equipped offices
• MySii app
• Medical care