Hands-On Data Science Lead

Sii Poland; Szczecin; On-site; PLN 240,000 - 360,000; Full time

Benefits offered by this job

AI Grant

AI Center of Excellence

Your tools, your choice

Real project variety

Conference and speaking support

Profit sharing

Medical care

Job summary

Sii Poland is seeking a technical lead to own the end-to-end direction of data science projects. You will frame client problems, validate modeling approaches, review work, and ensure deliverables run smoothly across platforms like Microsoft Fabric, Palantir Foundry, Databricks, and major clouds.

The role is hands-on with Python and involves mentoring a team, setting standards, and making technical calls to keep projects on track.

Qualifications

• 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).
• Strong statistical and ML foundations: experimental design and validation.
• Familiarity with cloud/data platforms: Azure, AWS, GCP, Snowflake, Databricks, Palantir Foundry.
• Experience leading delivery in client-facing or consulting contexts: scoping, estimation, risk management.
• Strong communication skills for technical and non-technical audiences.
• Fluent English and fluent Polish; residing in Poland.

Responsibilities

• Own the technical direction of data science engagements: design, modeling approach, validation strategy, delivery quality.
• Lead and mentor a team of data scientists with code reviews and career development.
• Stay hands-on: prototype approaches and produce production-grade Python when needed.
• Translate client problems into scoped data science workstreams and manage expectations.
• Set and enforce engineering standards: reproducibility, tracking, testing, documentation.
• Guide platform decisions across cloud/data ecosystems and align with business outcomes.

Skills

Python

Data science mentoring

Communication

Fluent English

Fluent Polish

Education

Master's degree in a relevant field

Tools

Azure

AWS

GCP

Databricks

Palantir Foundry

Microsoft Fabric

SageMaker

Job description

Sii Poland is seeking a technical lead to own the end-to-end direction of data science projects. You will frame client problems, validate modeling approaches, review work, and ensure deliverables run smoothly across platforms like Microsoft Fabric, Palantir Foundry, Databricks, and major clouds.

The role is hands-on with Python and involves mentoring a team, setting standards, and making technical calls to keep projects on track.