Christian Zentgraf
Advisory Software Engineer at IBM
Columbus, Ohio, United States
Summary
🤩
Rockstar🎓
Top SchoolChristian Zentgraf is an advisory software engineer at IBM with five years of focused experience in database architecture and data movement/replication solutions. Based in Columbus, Ohio, he brings hands-on C++ backend expertise to large-scale data systems, contributing to high-profile open-source projects like Facebook’s Velox and Presto where he implemented base64url functions, improved windowing logic, and strengthened native execution tests. He combines engineering rigor with practical QA instincts—often surfacing and fixing subtle bugs around compression selection, JSON path handling, and authentication for internal communication. Christian’s background spans deep systems work rather than front-end polish, and he has a track record of refactoring for flexibility (e.g., optional row-number generation) that helps production systems evolve safely.
5 years of coding experience
Friedrich Schiller University Jena
Github Skills (23)
c-language10
strings10
testing10
text-manipulation10
data-management10
java10
base64-encoding10
javas10
query-parser10
query-engine10
cprogramming-language10
presto10
querying10
data-set9
sql-query9
Programming languages (7)
Github contributions (5)
facebookincubator/velox
Mar 2023 - Apr 2025
A composable and fully extensible C++ execution engine library for data management systems.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:437 reviews, 79 PRs, 4 branches in 2 years
Contributions summary:Christian primarily contributed to the development of the `velox` library, a C++ execution engine for data management systems. They implemented a `to_base64url` Presto function, which involved modifying several C++ files related to string functions, base64 encoding, and function registration within the Velox codebase. Furthermore, the user addressed naming issues and refactored the codebase to support optional row number generation, enhancing the library's functionality and flexibility for data processing tasks. They also fixed the selection of compression values for the TableWriteTest.
queryvectorizedcppdata-processingacceleration
prestodb/presto
Feb 2023 - Apr 2025
The official home of the Presto distributed SQL query engine for big data
Role in this project:Back-end Developer & QA Engineer
Back-end Developer & QA EngineerContributions:261 reviews, 62 PRs, 25 pushes in 2 years 1 month
Contributions summary:Christian primarily contributed to the back-end aspects of the Presto project, focusing on testing and code improvements within the native execution environment. They added tests for base64url conversions and window functions, ensuring code correctness and functionality. Additionally, the user addressed several code issues by fixing bugs and refactoring existing logic within the native execution code. These contributions include changes to handle JSON paths and incorporating JWT authentication for internal communication.
distributed-sqlquerybigdataquery-enginesql
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