Data Science Tech Lead — Hands-On & Mentorship

Sii Poland; Wrocław; On-site; PLN 280,000 - 420,000; Full time

Benefits offered by this job

Great Place to Work

Contracts with the biggest brands

Centre of internal trainings

Profit sharing

MySii app

Medical care

Job summary

Sii Poland is seeking a technical lead to guide end-to-end data science engagements, framing client problems, validating modeling approaches, and ensuring production-grade delivery. This hands-on role requires Python excellence, model critique, and mentoring a team across platforms such as Microsoft Fabric, Palantir Foundry, and Databricks.

You will drive technical direction, collaborate with AI Architects and data engineers, and align decisions with business outcomes.

Qualifications

• 6+ years in data science with production models.
• 2+ years leading or mentoring data scientists.
• Strong English and Polish language skills.
• Hands-on Python with pandas, NumPy, scikit-learn

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

Python

ML modeling

Team leadership

Tools

Azure

AWS SageMaker

GCP Vertex AI

Databricks MLflow

Palantir Foundry

Microsoft Fabric

Job description

Sii Poland is seeking a technical lead to guide end-to-end data science engagements, framing client problems, validating modeling approaches, and ensuring production-grade delivery. This hands-on role requires Python excellence, model critique, and mentoring a team across platforms such as Microsoft Fabric, Palantir Foundry, and Databricks.

You will drive technical direction, collaborate with AI Architects and data engineers, and align decisions with business outcomes.