Data BI Analyst

We're looking for an independent mid-to-senior Data or BI Analyst with real programmatic or ad tech experience. You would join one of Poland's largest online publishers, in the advertising area. Your purpose is to own the data layer of their advertising ecosystem. You'd connect raw data in columnar databases with day-to-day business operations by automating API data pulls, reporting and BI dashboard feeds. This is a role for someone who builds product-oriented analytical solutions, not someone who only runs reports.

Details:
Location: Warsaw, Poland. Hybrid, with 3 days a week in the office.
Employment: Full-time
Seniority: Mid to Senior
Stack: SQL, Python, ClickHouse, Trino, Power BI, REST APIs, Google Ad Manager, SSP, Airflow, Git

What you'll do
Own the analytics data layer across the advertising and programmatic ecosystem
Automate data extraction from ad platform and SSP APIs
Build and maintain the data feeds behind BI dashboards
Turn raw data from large-volume columnar databases into solutions the business can use
Work closely with the sales and programmatic teams

What you bring
3+ years in a Data Analyst, BI Analyst or similar role
Professional experience in advertising, programmatic or ad tech, with a solid understanding of SSPs and Google Ad Manager
SQL on large-volume columnar databases (ClickHouse, Trino, BigQuery, Hive)
Python for automation, including REST APIs and data processing
Proven ownership of analytical solutions and dashboards in Power BI, Superset or Tableau, beyond pure execution

Nice to have
Experience pulling data from the Google Ad Manager API or similar platforms
Git and orchestration tools such as Airflow
Daily use of AI coding assistants (Claude Code, Cursor, Codex) or other LLM tools
Background at a publisher or ad tech firm in a product-oriented role

Hiring process
Interview with Hiring manager
Task sheet, which focuses on your approach and reasoning (AI use is allowed)
Conversation with manager