Toai Duong
Senior Software Engineer at DeepUp
Berlin, Vietnam
Summary
🤩
Rockstar🎓
Top SchoolToai Duong is a Senior Software Engineer based in Berlin with seven years of experience building backend systems and working extensively with databases. He has delivered production software across companies from startups to scale-ups, most recently at Delivery Hero and now at DeepUp. An active open-source contributor, Toai has made meaningful backend contributions to the well-known Apache DataFusion SQL query engine, improving join execution plans, UDF validation, and SQL testing ergonomics. He combines pragmatic engineering with a focus on data correctness and performance, often surfacing subtle validation and partitioning issues before they reach production. Fluent in collaborating across distributed teams, he brings a developer-first approach and a curiosity for low-level data processing challenges. Outside work, his GitHub tagline—"I build stuffs, mostly databases"—speaks to a hands-on maker mindset that drives both feature work and infrastructure improvements.
7 years of coding experience
7 years of employment as a software developer
Foreign Trade University
Stackoverflow
1reputation
177reached
1answer
1question
Github Skills (13)
fusion10
rust10
sql10
arrow-js9
arrows9
apache-arrow9
query-engine9
dataframes8
dataframe8
android-intent6
xamarin-forms6
android6
intent-filter6
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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