Hands-On Data Science Tech Lead

Sii Poland; Toruń; On-site; PLN 260,000 - 420,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Centre of internal trainings

Many experts to learn from

Open management team

Job summary

Sii Poland is seeking a technical lead to steer end‑to‑end data science projects. You’ll own problem framing, modeling approaches, validation, and delivery quality while mentoring a team of data scientists.

You’ll stay hands‑on, writing production‑grade Python and challenging model choices, with influence across Microsoft Fabric, Palantir Foundry, Databricks, and cloud services. Fluent English and Polish are required.

Qualifications

• 6+ years in data science with models shipped to production
• 2+ years leading or mentoring data scientists
• Hands‑on Python across the data stack (pandas, NumPy, scikit‑learn, XGBoost)
• Experience with at least one cloud/data platform (Azure, AWS, GCP, Snowflake, Databricks, Palantir)
• Client-facing delivery experience: scoping, estimation, risk management
• Strong communication; ability to explain business impact to non‑tech audiences
• Fluent English (written and spoken) and Polish; residing in Poland

Responsibilities

• Own the technical direction of data science engagements from framing to delivery
• Lead and mentor a team of data scientists; code reviews and methodology reviews
• Stay hands‑on: prototype approaches and contribute production‑grade Python
• Translate client problems into scoped, estimable workstreams and push back when needed
• Set and enforce engineering standards: reproducibility, experiment tracking, testing
• Guide platform decisions across cloud/data ecosystems (Azure, AWS, GCP, Snowflake, Databricks)
• Collaborate with AI Architects and data engineers; align decisions with business outcomes
• Represent the team to clients: present results and defend methodology

Skills

Data science

Python

Communication

English

Polish

Leadership

Client-facing

Tools

Python

pandas

NumPy

scikit-learn

XGBoost

Azure ML

SageMaker

Databricks

Job description

Sii Poland is seeking a technical lead to steer end‑to‑end data science projects. You’ll own problem framing, modeling approaches, validation, and delivery quality while mentoring a team of data scientists.

You’ll stay hands‑on, writing production‑grade Python and challenging model choices, with influence across Microsoft Fabric, Palantir Foundry, Databricks, and cloud services. Fluent English and Polish are required.