Technical Lead, Data Science & AI Delivery

Sii Poland; Bydgoszcz; On-site; PLN 250,000 - 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

Job summary

Sii Poland is seeking a technical lead to steer end-to-end data science engagements, balancing leadership with hands-on Python work. You will mentor a team of data scientists, define modeling standards, and ensure production-quality results for client projects across cloud ecosystems.

Fluency in English and Polish is required, with at least 6 years in data science and 2 years in mentoring. The role emphasizes cross-team collaboration, client-facing communication, and delivering impactful AI

Qualifications

• 6+ years in data science with production model experience; minimum 2 years leading or mentoring data scientists.
• Hands-on Python across the data stack and ability to review and write the hard parts.
• Strong statistical and ML foundations with experimental design and validation experience.
• Experience with at least one cloud/data platform (Azure, AWS, GCP, Snowflake, Databricks, Palantir).

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

Python programming

Data science leadership

Statistical methods

ML model development

Cloud platforms

Client facing delivery

Communication skills

English fluent

Polish fluent

Production ML experience

Pandas

NumPy

scikit-learn

XGBoost

MLflow

Databricks

Tools

pandas

NumPy

scikit-learn

XGBoost

MLflow

Databricks

Job description

Sii Poland is seeking a technical lead to steer end-to-end data science engagements, balancing leadership with hands-on Python work. You will mentor a team of data scientists, define modeling standards, and ensure production-quality results for client projects across cloud ecosystems.

Fluency in English and Polish is required, with at least 6 years in data science and 2 years in mentoring. The role emphasizes cross-team collaboration, client-facing communication, and delivering impactful AI