Data Scientist: Build AI-Driven Cloud Data Apps

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

Benefits offered by this job

Great Place to Work

Solid financial situation

Centre of internal trainings

Profit sharing

Medical care

Regular integration events and trips

Job summary

Sii Poland is hiring data scientists to turn ambiguous business questions into usable models and analyses. You will frame problems, wrangle data, build and validate models, and explain results to non-technical stakeholders.

You’ll work with the Python data stack (pandas, NumPy, scikit-learn) and enterprise platforms like Microsoft Fabric, Palantir Foundry, and cloud services on Azure, AWS, or GCP. Fluent English and Polish are required, and residing in Poland is expected.

Qualifications

• 4+ years in data science or applied analytics, with models and analyses that progressed beyond prototype.
• Strong Python skills across the standard data stack (pandas, NumPy, scikit-learn).
• Knowledge of cloud/data platforms and their data science components (Azure, AWS, GCP, Snowflake, Databricks, Palantir).
• Ability to communicate analytical results clearly to business stakeholders and influence decisions with data.

Responsibilities

• Translate business problems into analytical solutions: define hypotheses, choose metrics, and select appropriate modeling approaches.
• Explore, clean, and prepare data using Python and multiple data sources with varying quality.
• Build, validate, and tune machine learning models for classification, regression, forecasting, segmentation, and recommendation.
• Design and analyze experiments: A/B tests, hypothesis testing, and causal analysis.
• Collaborate with data engineers and ML/AI engineers to move models from notebook to production.

Skills

English fluency

Stakeholder communication

Analytical thinking

Autonomy

Tools

Python

pandas

NumPy

scikit-learn

XGBoost

statsmodels

Azure

AWS

GCP

Snowflake

Databricks

Palantir Foundry

Job description

Sii Poland is hiring data scientists to turn ambiguous business questions into usable models and analyses. You will frame problems, wrangle data, build and validate models, and explain results to non-technical stakeholders.

You’ll work with the Python data stack (pandas, NumPy, scikit-learn) and enterprise platforms like Microsoft Fabric, Palantir Foundry, and cloud services on Azure, AWS, or GCP. Fluent English and Polish are required, and residing in Poland is expected.