Erva Sude Karali

Data and BI professional with 1.5+ years of experience spanning data engineering, business intelligence, and ETL/ELT development. Hands-on expertise in SQL, dbt, Power BI, and Google Cloud Platform (BigQuery). Proven ability to deliver end-to-end data solutions from pipeline development and data modeling to dashboard reporting and data quality management.

Data Engineering Intern at Hepsiburada (2026-03 – Present)

• Developed and maintained dbt models within a BigQuery-based data warehouse, implementing transformation logic across staging, intermediate, and mart layers
• Authored complex SQL queries for both pipeline development and reporting purposes, supporting data availability across Sales and other business domains
• Delivered end-to-end documentation for the Sales domain covering source-to-target data mapping, model lineage, and transformation logic across dbt and BigQuery warehouse layers

BI & Data Analytics Intern at LC Waikiki (2025-01 – 2025-11)

• Gained hands-on exposure to ETL pipeline development using Google BigQuery and Cloud Dataflow while supporting data engineering team
• Developed and maintained interactive Power BI dashboards monitoring operational and financial KPIs for 15+ stakeholders, enabling data-driven decision-making across departments
• Resolved 200+ data inconsistency and corruption cases reported from call center operations, improving data quality accuracy by 30%
• Optimized BigQuery SQL queries achieving 35% faster query performance through indexing strategies and query restructuring
• Collaborated with cross-functional teams in Agile/Scrum framework using JIRA, consistently completing sprint tasks and contributing to 5+ major projects

Business Intelligence Intern at LC Waikiki (2024-07 – 2024-09)

• Created interactive Power BI dashboard with dynamic slicers, conditional formatting, and drill-through capabilities for retail operations analysis
• Wrote and optimized 50+ complex SQL queries (T-SQL, BigQuery) for data extraction and transformation, improving report generation efficiency by 40%
• Implemented advanced DAX calculations and custom measures in Power BI to analyze sales trends, inventory turnover, and customer behavior patterns

Bachelor of Business Administration in Management Information Systems – Marmara University (2026-06)