Toai Duong
Senior Software Engineer at DeepUp
Berlin, Germany
Summary
🤩
Rockstar🎓
Top SchoolToai Duong is a Senior Software Engineer in Berlin with six years of experience building reliable backend systems for high-growth companies. He currently engineers at Delivery Hero after roles across Manabie, FPT Software and Sutrix Group, bringing hands-on production experience in scaled services. An active open-source contributor to the Apache DataFusion SQL engine, he has strengthened core query processing—adding partitioning checks to hash and sort‑merge joins, validating UDF outputs, extending unnest semantics, and improving explain-test formatting. That blend of production backend work and low-level query‑engine contributions highlights a pragmatic focus on correctness, performance and observability in data‑intensive systems.
7 years of coding experience
7 years of employment as a software developer
Foreign Trade University
Stackoverflow
1reputation
177reached
1answer
1question
Github Skills (14)
fusion10
rust10
sql10
arrowjs9
arrow-js9
arrows9
apache-arrow9
query-engine9
dataframes8
dataframe8
android-intent6
android6
intent-filter6
xamarinforms6
Programming languages (4)
Github contributions (5)
apache/datafusion
Mar 2023 - Mar 2025
Apache DataFusion SQL Query Engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:44 reviews, 11 PRs, 97 comments in 2 years
Contributions summary:Toai primarily contributed to the Apache DataFusion SQL query engine, focusing on implementing and refining core query processing functionalities. Their work involved adding assertions and validations within the hash join and sort merge join execution plans, ensuring data partitioning counts match. They also worked on refining existing features like UDF output validation and extending unnest functions to support more complex data types. The user also updated the SQL logic testing framework to enhance explain result formatting.
querypythonquery-enginedataframerust
duongcongtoai/arrow-datafusion
Mar 2023 - Mar 2025
Apache Arrow DataFusion SQL Query Engine
Contributions:5 PRs, 146 pushes, 13 branches in 2 years
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