Data Science Technical Lead — Build & Guide AI Projects

Sii Poland; Poznań; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

AI Grant budget & resources

AI Center of Excellence collaboration

Conference and speaking support

Mobile/Hybrid work options

Job summary

Sii Poland is seeking a Technical Lead for data science to own end-to-end technical direction, from framing problems with clients to approving modeling approaches and ensuring delivery quality. This hands-on role requires mentoring a team of data scientists and maintaining production-grade Python solutions.

You will work across platforms like Microsoft Fabric, Palantir Foundry, Databricks, and major clouds, while maintaining strong client communication in English and Polish.

Qualifications

• At least 6 years in data science with production models shipped.
• Minimum 2 years leading or mentoring data scientists.
• Hands-on Python and data stack proficiency.
• Strong statistical, ML, and experimental design foundations.
• Experience with cloud/data platforms (Azure, AWS, GCP, Snowflake, Databricks, Palantir).
• Experience delivering in client-facing or consulting contexts.
• Excellent written and spoken English and Polish.

Responsibilities

• Own the technical direction of data science engagements: solution design, modeling approach, validation strategy, delivery quality.
• Lead and mentor a team of data scientists through code reviews, methodology reviews, and career development.
• Stay hands-on: prototype approaches and contribute production-grade Python where it matters.
• Translate client problems into scoped, estimable data science workstreams and push back when needed.
• Set and enforce engineering standards for reproducibility, experiment tracking, testing, and documentation.
• Guide platform decisions across cloud/data ecosystems (Microsoft Fabric, Foundry, Databricks, Snowflake).'
• Collaborate with AI architects, data engineers, and client stakeholders to align decisions with business outcomes.
• Represent the team to clients: present results, defend methodologies, and manage expectations.

Tools

Python

Pandas

NumPy

scikit-learn

XGBoost

Cloud platforms

Communication skills

Fluent English

Fluent Polish

Client-facing experience

Job description

Sii Poland is seeking a Technical Lead for data science to own end-to-end technical direction, from framing problems with clients to approving modeling approaches and ensuring delivery quality. This hands-on role requires mentoring a team of data scientists and maintaining production-grade Python solutions.

You will work across platforms like Microsoft Fabric, Palantir Foundry, Databricks, and major clouds, while maintaining strong client communication in English and Polish.