Joy Yao
Software Engineer at Facebook
San Francisco, California, United States
Summary
👤
Senior🎓
Top SchoolJoy Yao is a seasoned software engineer based in San Francisco with 11 years of experience building high-performance, multi-threaded enterprise systems and deep expertise across relational and NoSQL databases (DB2, Oracle, Informix, Netezza, Sybase, MS SQL Server, MongoDB). She has a strong track record at large organizations—most recently Facebook—and a long tenure at IBM where she led CDC development and performance optimization for Netezza and Informix while mentoring junior engineers. Comfortable in Core Java back-end development, Joy has contributed to notable open-source projects like Presto, adding date/time functions and optimizing query execution. Her background combines rigorous analytical problem solving, hands-on performance profiling, and clear technical communication, and she brings a proactive, accountable approach to complex distributed data systems.
11 years of coding experience
10 years of employment as a software developer
Bachelor's degree, Computer Science, 3.9/4, Bachelor's degree, Computer Science, 3.9/4 at York University
English, Chinese
Github Skills (16)
query-engine10
javas10
databases10
big-data10
sql-query10
query-optimization10
presto10
sql10
java10
data-model10
database10
data-set10
user-data10
sql-parser9
testing8
Programming languages (1)
Github contributions (1)
prestodb/presto
Jan 2015 - Nov 2016
The official home of the Presto distributed SQL query engine for big data
Role in this project:
Back-end Developer
Back-end DeveloperContributions:58 commits in 1 year 10 months
Contributions summary:Joy primarily contributed to the Presto query engine, adding and modifying features related to date and time functions, as well as query events. This includes implementing the `year_of_week` function and adding the Presto server version to query completion events. The user also refactored and optimized the codebase for query execution. The changes involved Java code, testing, and documentation updates.
distributed-sqlquerybigdataquery-enginesql
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