Hands-On Data Science Tech Lead

Sii Poland; Lublin; On-site; PLN 240,000 - 380,000; Full time

Benefits offered by this job

AI Grant

AI Center of Excellence

Your tools, your choice

Real project variety

Conference and speaking support

Job summary

Sii Poland is seeking a Technical Lead for data science to own end-to-end technical direction, mentor a team of data scientists, and stay hands-on with production-grade Python. You will guide platform decisions across Fabric, Foundry, Databricks, Snowflake, and cloud services while translating client problems into actionable workstreams.

The role emphasizes leadership, collaboration with AI architects and client stakeholders, and strong communication in English and Polish.

Qualifications

• 6+ years in data science with production models shipped.
• At least 2 years leading or mentoring data scientists.

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 — Azure 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.

Skills

Python programming

Data science production

People leadership

Statistics & ML

Cloud platforms

Client-facing

Fluent English

Fluent Polish

Communication

Tools

pandas

NumPy

scikit-learn

XGBoost

MLflow

Azure Machine Learning

SageMaker

Vertex AI

BigQuery ML

Databricks ML

Palantir Foundry

Snowflake

Fabric

Foundry Code Workspaces

Foundry ML

AIP

Job description

Sii Poland is seeking a Technical Lead for data science to own end-to-end technical direction, mentor a team of data scientists, and stay hands-on with production-grade Python. You will guide platform decisions across Fabric, Foundry, Databricks, Snowflake, and cloud services while translating client problems into actionable workstreams.

The role emphasizes leadership, collaboration with AI architects and client stakeholders, and strong communication in English and Polish.