Sefa Yildiz
Data Analytics Specialist
Madrid, Community of Madrid, Turkey
Summary
👤
Senior🎓
Top SchoolSefa Yildiz is a Data Analytics Specialist with 15 years of experience who turns complex data into actionable business outcomes at TEMSA, having built end-to-end ETL pipelines and multiple Power BI dashboards that improved decision-making across Finance, After Sales, and Strategy teams. Selected from 10,000 candidates for Sabancı Holding’s SEED Management Trainee program, he combines strong academic credentials (MSc in Data Science, BSc in Industrial Engineering, both 3.75 GPA) with hands-on cloud expertise in Azure Data Factory, Synapse, and Microsoft Fabric. His master's work on Graph Neural Networks for optimization signals a research-driven approach to solving complex problems, while practical skills in PyTorch, DGL, PySpark, Python and SQL enable production-ready ML and analytics solutions. Comfortable both teaching and scaling analytics—he supported hundreds of students as a TA—Sefa uniquely blends storytelling, data quality governance, and cross-department collaboration to drive measurable business impact.
15 years of coding experience
Master of Science - MS, Data Science, 3.75/4.00, Master of Science - MS, Data Science, 3.75/4.00 at Sabanci UniversityExchange Program, Exchange Program at National University of Singapore
English, Turkish
Github Skills (41)
formulas9
geolocation9
kotlin8
kotlin-android8
java7
push-notifications7
google7
static-site7
tcm7
php7
splunk7
firebase7
maps6
auth6
android6
Programming languages (7)
Github contributions (5)
sayz/file
Dec 2010 - Jan 2016
Contributions:24 commits, 1 push in 5 years 1 month
sayz/docker
Oct 2016 - Oct 2016
Contributions:8 pushes, 1 branch in 1 day
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