GülSen Üşümüş

Data Analyst with hands-on experience in data cleaning, analysis, and visualization using SQL, Python, Power BI, Excel and SAP (MM and SD modules). Strong problem-solving skills gained through sales forecasting, customer analysis, and EDA projects. Knowledge of statistical analysis, machine learning, and predictive modeling for actionable insights.

Background in business analysis and UI/UX, combining technical and business understanding to support KPI reporting, dashboards, and data-driven decision-making.

Master Data and Process Management Assistant Specialist at CALIK ENERGY INDUSTRY AND TRADE INC. (2025-09 – Present)

• Improved operational process flow by utilizing SAP MM and SD modules, helping reduce transaction handling time by approximately 20–25%.
• Improved data accuracy by supporting the management of 5,000+ master data records across operational processes.
• Contributed to process improvement initiatives that reduced manual workload by approximately 15%.
• Supported reporting and workflow tracking operations across 3+ departments.

Business Analyst at PREPTEST STARTUP (2025-01 – 2025-09)

• Contributed to the development of 10+ new website features to improve user experience and platform functionality.
• Supported gamification-based feature development processes that led to approximately 20% growth in user engagement and acquisition.
• Took an active role in mobile application development and user flow improvement processes.
• Analyzed 1,000+ user records using MySQL to identify user behaviors, trends, and product opportunities.
• Conducted competitor analysis across 10+ platforms to identify market trends and product opportunities.
• Prepared weekly product and data insight reports to support data-driven decision-making processes.

Retail Plan. and Business Development Mgr. — Micromobility Team Member at OTOKOC AUTOMOTIVE INC. (2023-12 – 2024-11)

• Conducted market and competitor analyses supporting sales and business development strategies.
• Analyzed customer feedback data and contributed to approximately 10% increase in customer satisfaction.
• Coordinated operational processes with 5+ cross-functional teams and stakeholders.
• Contributed to operational planning activities that improved project delivery efficiency by approximately 15%.
• Supported KPI, sales, and operational reporting processes to improve workflow efficiency.

Innovation and Entrepreneurship — Micromobility at OTOKOC AUTOMOTIVE INC. (2023-01 – 2023-12)

• Supported operations, sales, and after-sales processes across 15+ branches.
• Contributed to operational improvements that reduced issue resolution time by approximately 20%.
• Supported sales and operational workflows to improve daily process efficiency.
• Assisted billing and workflow tracking operations contributing to reduced operational errors.

Office Staff— Project Based at UCTEA CHAMBER OF GEOLOGICAL ENGINEERS (2022-05 – 2022-11)

• Supported operational coordination for 10+ professional events and organizations.
• Assisted workflow tracking and communication processes to ensure timely execution.
• Contributed to event organization and daily operational management activities.

Quality Control Specialist Purchasing at GENC LTD. - FOOD, COSMETICS CHEMICALS (2020-03 – 2022-01)

• Managed purchasing and supplier communication processes with 20+ suppliers.
• Supported daily quality control operations to reduce production-related issues.
• Contributed to uninterrupted production workflows through effective material supply coordination.
• Assisted process tracking and procurement operations to improve operational efficiency.

Management Information Systems — AUZEF – ISTANBUL UNIVERSITY (2024)

Geological Engineering — Faculty of Engineering – ISTANBUL UNIVERSITY (2013 – 2018)