Ozan Özyüksel
Verified Expert in Engineering
Data Analytics Developer
Berlin, Germany
Toptal member since November 12, 2025
Ozan is a data analytics manager with 15+ years of experience delivering business impact through data engineering, analytics, and visualization. He is skilled in executing data strategies and leading cross-functional teams to build scalable data solutions, optimize ETL pipelines, and design actionable dashboards. An expert in AWS Redshift, Tableau, SQL, Python, Oracle, and other technologies, Ozan transforms complex data into insights that drive strategic decision-making.
Portfolio
Experience
- SQL - 15 years
- Amazon Redshift - 5 years
- Tableau - 5 years
- Amazon Athena - 4 years
- BigQuery - 4 years
- Syniti - 2 years
- Metabase - 2 years
- Looker Studio - 1 year
Preferred Environment
SQL, Tableau, Metabase, Python, Databricks
The most amazing...
...thing I've developed is the data warehouse (DWH) and business intelligence (BI) stack from scratch.
Work Experience
Senior Product and Data Analyst
Zalando SE
- Collaborated with data engineering teams to design executive dashboards in Looker Studio, tracking revenue and KPIs that enabled data-driven decisions for product owners.
- Developed KPI framework and A/B testing analytics using EPPO, delivering 8% conversion increase on board-sharing feature through statistical analysis.
- Built scalable data pipelines in Databricks using SQL and Python, integrating AWS S3, Unity Catalog, and BigQuery to support product analytics.
- Created data governance standards through tracking plans for new features, validating implementations with Git version control to ensure data quality.
BI Consultant
Punto Medya
- Designed and deployed interactive Tableau dashboards.
- Built a data pipeline on top of AWS Redshift using Airflow.
- Improved reporting efficiency by 30% by creating interactive dashboards.
Data Analytics Manager, Finance Systems
OLX Global
- Headed and delivered the global SAP S/4HANA ERP data migration project for 10+ countries in 3 waves using Syniti ADM, supervising a data team of 20+ members.
- Managed data sharing, preparation, enrichment, and visualization tasks using SQL, Python, and Tableau within the financial applications ecosystem. Enhanced the main ERP data pipeline, improving performance by up to 40%.
- Executed vendor management strategies by overseeing relationships, reviewing and processing purchase orders (POs) through Coupa, and overseeing statements of work (SoWs) to maintain operational efficiency and alignment with organizational goals.
Experience
SAP S/4HANA ERP Data Migration
In doing so, I ensured that all necessary data transformations were performed to align with the target system requirements, that pre-load validation reports were consistent and reliable, and that data from each entity was completely and accurately loaded into the target system. I also oversaw the sign-off process, confirming that all data loads were executed as planned.
Skills
Tools
BigQuery, Tableau, Looker, Apache Airflow, Amazon Athena, Informatica ETL
Languages
SQL, Python
Paradigms
ETL, Business Intelligence (BI)
Platforms
Databricks, Amazon Web Services (AWS), Oracle Data Integrator (ODI)
Storage
Data Pipelines, Exadata, MySQL, Database Administration (DBA), Database Modeling, Database Caching, PostgreSQL
Frameworks
Apache Spark
Other
Amazon Redshift, Data Analysis, Data Analytics, Data Engineering, Data Modeling, Complex Data Analysis, Data Quality, Architecture, Data Architecture, DataOps, BI Reports, Google BigQuery, Looker Studio, Syniti, SAP Data Services, Scripting, Financial Data, Database Optimization, Database Partitioning, Metabase, Eppo, A/B Testing, Google Tag Manager, IT Project Management, Budget Management
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