Open to opportunities

Marcin Olejniczak

@marcinolejniczak

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Inventory-focused manager and data analyst optimizing supply chains.

Poland

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What I'm looking for

I seek a data-driven operations role where I can optimize inventory and logistics, lead teams, and apply forecasting and analytics to reduce costs and improve efficiency.

I am an experienced inventory management professional and data analyst with a proven record of maintaining appropriate stock levels, optimizing transportation and storage costs, and producing actionable reports and forecasts. I have led teams, supported returns and quality-control processes, and prepared financial and sales forecasts for multi-state operations.

I combine hands-on production and warehouse leadership with analytical skills in spreadsheets, SQL, Tableau, and data visualization, backed by the Google Data Analytics Professional Certificate. I deliver process improvements, cost reductions, and data-driven decisions to improve operational continuity and efficiency.

Experience

Work history, roles, and key accomplishments

Current

Production Machine Operator

Current

Wytwórnia Opakowań Wojciech Kenkel

Oct 2024 - Present (11 months)

Perform quality control and ensure manufactured products meet specifications while maintaining continuity of the production process. Monitor operations to sustain throughput and compliance.

Quality Control Spreadsheets Data Analytics

Data Analyst

Buffalo Market

Oct 2022 - Jul 2024 (1 year 9 months)

Maintained appropriate inventory levels and prepared orders based on sales data and forecasts, reducing transport and storage costs through data-driven optimizations. Produced inventory, sales, and financial reports for forecasting.

SQL Tableau Spreadsheets Inventory Management Forecasting Data Visualization Financial Reporting Cost Optimization

Warehouse Staff / Returns Specialist

DTS Group

May 2022 - Oct 2022 (5 months)

Executed quality control of products and processes, recorded deviations from standards, and supported returns and complaints workflows to improve reverse logistics accuracy.

Quality Control Compliance

Shipping Department Lead

Amazon

Mar 2021 - May 2022 (1 year 2 months)

Co-managed a team of up to 40 people, monitored and optimized sorting processes, and oversaw truck loading to ensure departures met schedule readiness. Improved operational throughput on the flat sorter.

Team Leadership Process Optimization Logistics Monitoring

Education

Degrees, certifications, and relevant coursework

Google

Professional Certificate, Data Analytics

Completed the Google Data Analytics Professional Certificate comprising eight courses with hands-on assessments preparing for introductory-level data analytics roles.