Data Scientist – Python & Cloud Data Platforms (f/m/x)

Miejsce pracy: Rzeszów

Technologies we use

Expected

Cloud Computing
Python
Data Platforms
XGBoost
Pandas
NumPy
Scikit-learn
Google Cloud Platform

Optional

Palantir Foundry
Snowflake
Microsoft Fabric
Natural Language Processing
LLM
MLflow
Apache Spark
Time Series Forecasting
Microsoft Power BI

About the project

We’re looking for data scientists who turn ambiguous business questions into models and analyses that actually get used. You’ll frame the problem, wrangle the data, build and validate models, and — just as importantly — explain what the numbers mean to people who don’t speak Python. Your day-to-day will revolve around the classic Python data stack: pandas, NumPy, and scikit-learn.

You’ll also work on modern enterprise data platforms — running notebooks and lakehouse workloads in Microsoft Fabric, building pipelines and operational applications in Palantir Foundry, and deploying analytics on Azure, AWS, or GCP. The science matters, but so does making it work inside a real organization’s data ecosystem.

Your responsibilities

Translate business problems into analytical solutions: define hypotheses, choose metrics, and select the right modeling approach for the question at hand
Explore, clean, and prepare data using Python (pandas, NumPy), working with structured and semi-structured sources of varying quality
Build, validate, and tune machine learning models for classification, regression, forecasting, segmentation, and recommendation using scikit-learn, XGBoost, and statsmodels
Design and analyze experiments: A/B tests, statistical hypothesis testing, and causal analysis that hold up to scrutiny
Work hands-on with enterprise data platforms such as Microsoft Fabric (lakehouses, notebooks, semantic models) and Palantir Foundry (pipelines, ontology, operational workflows)
Communicate findings through clear visualizations, dashboards, and narratives tailored to technical and non-technical stakeholders alike
Collaborate with data engineers on data availability and quality, and with ML/AI engineers to move models from notebook to production
Monitor deployed models for drift and degradation, and own the retraining and improvement cycle

Our requirements

At least 4 years in data science or applied analytics, with models and analyses that made it past the prototype stage
Strong Python skills across the standard data stack (pandas, NumPy, scikit-learn)
Solid statistical foundations: hypothesis testing, regression, experimental design, and knowing when a result is real versus noise
Knowledge of at least one cloud/data platform and its data science components — Azure (Microsoft Fabric, Azure Machine Learning), AWS (SageMaker), GCP (Vertex AI, BigQuery ML), Snowflake (Snowpark ML, Cortex), Databricks (MLflow, Mosaic AI), or Palantir (Foundry Code Workspaces, Foundry ML, AIP)
Ability to communicate analytical results clearly to business stakeholders and influence decisions with data
Familiarity with working autonomously while collaborating effectively with data engineers, architects, and product teams
Fluent English, both written and spoken
Fluent Polish required
Residing in Poland required

Optional

Production experience with Microsoft Fabric or Palantir Foundry certification (Foundry Data Engineer / Data Scientist tracks)
Experience with time series forecasting, NLP, recommender systems, or exposure to LLM-based workflows
Familiarity with MLOps practices: MLflow, experiment tracking, model versioning, and CI/CD for ML
Experience with Power BI or other BI tools, and distributed processing with Spark/PySpark

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

Send your CV
Talk to us about your expectations
Learn more about our projects and choose the best
Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.

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

Data Scientist - Python & Cloud Data Platforms (f/m/x)

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