Data Science Tech Lead — Hands-on Leader & Mentor

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

Benefits offered by this job

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Job summary

Sii Poland is seeking a technical lead to steer data science engagements end-to-end, combining hands-on Python craftsmanship with mentoring and setting high standards. You will shape problem framing, modeling choices, validation, and delivery quality across platforms like Azure, Databricks, and Palantir Foundry.

You'll coach a team of data scientists, review methodologies, and ensure solutions scale in production while communicating business impact to clients and stakeholders.

Qualifications

• Minimum 6 years in data science with production models shipped.
• 2+ years leading or mentoring other data scientists.
• Strong Python skills across the data stack (pandas, NumPy, scikit-learn, XGBoost).
• Experience with cloud/data platforms (Azure, AWS, GCP, Snowflake, Databricks).

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.

Skills

Data science

Leadership

Fluent English

Fluent Polish

Client-facing communication

Tools

Python

pandas

NumPy

scikit-learn

XGBoost

Job description

Sii Poland is seeking a technical lead to steer data science engagements end-to-end, combining hands-on Python craftsmanship with mentoring and setting high standards. You will shape problem framing, modeling choices, validation, and delivery quality across platforms like Azure, Databricks, and Palantir Foundry.

You'll coach a team of data scientists, review methodologies, and ensure solutions scale in production while communicating business impact to clients and stakeholders.