Technical Lead — Data Science (f/m/x)

Miejsce pracy: Katowice

Technologies we use

Expected

Cloud Computing
Python
Pandas
XGBoost
Scikit-learn
Data Platforms
NumPy

Optional

MLOps
GenAI
LLM
Palantir Foundry
Microsoft Fabric

About the project

We’re looking for a technical lead who can do two hard things at once: keep a team of data scientists shipping work that holds up to scrutiny, and stay close enough to the code to know when it doesn’t. You’ll own the technical direction of data science projects end-to-end — from framing the problem with the client to signing off on the modeling approach, reviewing the work, and making sure what gets delivered actually runs.

This is a hands-on role. You’ll still write Python, still challenge model choices, still dig into why the metrics look too good. But your biggest impact will come through others — setting standards, mentoring the team, and making the technical calls that keep projects on track across platforms like Microsoft Fabric, Palantir Foundry, Databricks, and the major clouds.

Your responsibilities

Own the technical direction of data science engagements: solution design, modeling approach, validation strategy, and delivery quality
Lead and mentor a team of data scientists — code reviews, methodology reviews, career development, and raising the bar on what "done" means
Stay hands-on: prototype approaches, unblock the team on hard modeling problems, and contribute production-grade Python where it matters most
Translate client business problems into scoped, estimable data science workstreams, and push back when the problem doesn’t need a model
Set and enforce engineering standards for the team: reproducibility, experiment tracking, testing, and documentation
Guide platform decisions and delivery across cloud/data ecosystems — Microsoft Fabric, Palantir Foundry, Databricks, Snowflake, and native Azure/AWS/GCP services
Work with AI Architects, data engineers, and client stakeholders to align technical decisions with business outcomes and timelines
Represent the team in front of clients: present results, defend methodology, and manage technical expectations

Our requirements

At least 6 years in data science with a track record of models shipped to production, including a minimum of 2 years leading or mentoring other data scientists
Deep, hands-on Python skills across the standard data stack (pandas, NumPy, scikit-learn, XGBoost) — you can still review and write the hard parts yourself
Strong statistical and ML foundations: experimental design, validation methodology, and the judgment to spot results that won’t survive contact with reality
Familiarity with 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)
Experience leading delivery in a client-facing or consulting context: scoping, estimation, and managing technical risk
Strong communication skills — able to defend a methodology to a technical audience and explain its business impact to a non-technical one
Fluent English (both written and spoken)
Fluent Polish required
Residing in Poland required

Optional

Production experience with Microsoft Fabric or Palantir Foundry, or relevant platform certifications
Experience with MLOps at team scale: CI/CD for ML, model registries, monitoring, and governance
Exposure to GenAI/LLM projects and judgment about where they do — and don’t — belong in a data science solution
Public technical presence: conference talks, publications, or open-source contributions

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

This is how we work on a project

Continuous Deployment
Continuous Integration

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.

Technical Lead — Data Science (f/m/x)

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