Timothy Saucer
Software Engineer at Rerun
Ann Arbor, Michigan, United States
Summary
🤩
Rockstar🎓
Top SchoolTimothy Saucer is a senior software engineer with nine years of professional experience building scalable autonomy and data platform systems, currently helping Rerun bring data visualization tools to production for Physical AI. His background spans robotics, autonomy infrastructure, and AI—leading DARPA efforts and autonomy teams at Soar Technology and May Mobility—combining low-level systems work in Rust and C++ with front-end and platform engineering. He contributes to notable open-source projects like Apache DataFusion, improving core query engine robustness and refactoring aggregate/window function implementations. A former Navy officer and PhD physicist from the University of Michigan, he pairs disciplined systems thinking and team leadership with hands-on coding across the stack. Colleagues describe him as pragmatic and curious—willing to “run for pizza”—which captures his blend of drive and approachability.
9 years of coding experience
16 years of employment as a software developer
PhD Physics, PhD Physics at University of Michigan
English
Stackoverflow
16reputation
135reached
1answer
0questions
Github Skills (10)
fusion10
query-engine10
rust10
sql10
arrow-js9
arrow-keys9
arrows9
eclipse-cdt6
eclipse6
cmake6
Programming languages (7)
Github contributions (5)
apache/datafusion
May 2024 - Mar 2025
Apache DataFusion SQL Query Engine
Role in this project:
Back-end Developer
Back-end DeveloperContributions:53 reviews, 31 PRs, 10 pushes in 11 months
Contributions summary:Timothy made several contributions focused on improving the `datafusion` query engine. Their work included checking list sizes before concatenation in `ScalarValue` to prevent errors, and refactoring aggregate and window functions by introducing `ExprFunctionExt`. Additionally, they removed physical sort parameters from aggregate window functions, streamlining the code. These changes involved modifications to core data structures and function definitions within the engine.
querypythonquery-enginedataframerust
timsaucer/datafusion
May 2024 - Apr 2025
Apache DataFusion SQL Query Engine
Contributions:108 pushes, 34 branches in 11 months
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