Emilia Matrejek Data Analyst

Data Analyst (Commercial Analytics)

Allegro

Oct 2025 - Current (9 months)

• Analyzing big data with a focus on sales metrics (GMV, ASP, CR, view-to-cart rate, bounce rate) using SQL and Python to derive actionable insights that drive business decisions. • Building robust sales forecasting models leveraging SQL and Python to enhance predictive accuracy. • Developing applications for business users in Colab/AppSheets HTML pages/Streamlit applications ensuring user-friendly interfaces and efficient data processing. • Presenting insights and maintaining ongoing communication with stakeholders at all levels through Google Cloud Platform, facilitating informed decision-making. • Additionally, utilized Airflow to automate Google Query (GQ) processes through Directed Acyclic Graphs (DAG), streamlining data workflows

Analyst in the Insights team

RTB House

Feb 2025 - Sep 2025 (8 months)

• Analyzing big data in a niche, emerging domain (programmatic) (SQL, GraphQL, Grafana, Python, Google Cloud Platform); • deriving insights from data and developing new methodologies and processes based on those insights; • presenting data and findings to senior leadership; • building applications with machine-learning-driven backends for business users.

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SSP Integrations Analyst

RTB House, Warsaw

Jan 2024 - Feb 2025 (1 year 2 months)

• Leading end-to-end integration of a new platform at all levels (partner acquisition, legal processes, technical integration); • expanding live monitoring systems for metric discrepancies (Google Sheets, AppsScript, SQL, Python, Google Cloud Platform); • analyzing root causes of poor performance; • maintaining ongoing online and offline communication with partners.

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Junior Platform Specialist

RTB House, Warsaw

Jul 2022 - Jan 2024 (1 year 7 months)

As a Junior Platform Specialist, I was responsible for analyzing industry data using SQL and Google Sheets, ensuring accurate and actionable insights for our projects. I liaised with partners to provide essential data, facilitating collaboration and project success. Additionally, I assisted in developing workflows and methodologies in a new environment, enhancing operational efficiency. My experience with BigQuery was integral to my role, as I utilized it daily for data extraction, which streamlined our data analysis processes and improved the overall quality of our deliverables.

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First Line Analyst 2

Computacenter Sp. zo.o.

Oct 2021 - Jul 2022 (10 months)

• Providing technical support to employees in German; • resolving IT issues on the first line of support via phone and email; • maintaining proper workflow hygiene in the ticketing system (ServiceNow)

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IT Analyst First

Computacenter Sp. z.o.o.

May 2021 - Oct 2021 (6 months)

Emilia Matrejek

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