Berkay Şahin
Platform Engineer
Ankara, Ankara, Turkey
Summary
🤩
Rockstar🎓
Top SchoolBerkay Şahin is a software engineer based in Ankara with three years of experience building robust back-end systems at Synnada and Aselsan. He holds a bachelor's in Electrical and Electronics Engineering and is pursuing a master's in Computer Engineering at Middle East Technical University. Berkay contributes to Apache DataFusion, where he refactored core batch processing, fixed union type-casting bugs, and optimized time-based arithmetic—work that improved query engine efficiency in a widely used open-source SQL engine. His day-to-day blends production engineering with low-level data processing improvements, showing a knack for turning algorithmic fixes into tangible performance gains. Colleagues describe him as a practical problem-solver who moves clean, maintainable changes through complex codebases.
3 years of coding experience
5 years of employment as a software developer
Master's degree Computer Engineering, Master's degree Computer Engineering at Orta Doğu Teknik Üniversitesi / Middle East Technical University
İngilizce, Turkish
Github Skills (11)
fusion10
query-engine10
rust10
arrow-keys10
sql10
arrows10
arrow-js10
data-structure9
data-structures9
big-data9
algorithms9
Programming languages (2)
Github contributions (5)
apache/datafusion
Feb 2023 - Apr 2026
Apache DataFusion SQL Query Engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:440 reviews, 163 PRs, 73 pushes in 3 years 2 months
Contributions summary:Berkay primarily focused on refactoring and improving the `datafusion` query engine. They removed the `merge_batches` function and replaced it with `concat_batches`, improving data processing efficiency. They addressed and corrected type casting issues in the union functionality to resolve a data integrity bug. The user also implemented and optimized time-based arithmetic operations within the query engine.
sql-queryarrowbig-datadataframedatafusion
synnada-ai/datafusion-upstream
Feb 2024 - Sep 2025
Apache Arrow DataFusion SQL Query Engine
Contributions:54 reviews, 22 PRs, 405 pushes in 1 year 7 months
apache-arrowsql-query
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