# Yunfei Xie

> Software Engineer

Location: San Francisco, California, United States
Profile: https://flows.cv/yunfeixie

During my 14+ years at IBM I had worked on the Agent Services component of Db2 z/OS which involves the creation, synchronization and overall management of all application and system agents that run in Db2.  I also developed numerous features for the ODBC DB2 z/OS driver, that maintained currency with industry standards and optimized performance.  These all involve highly concurrent, heavy workload applications dealing with high data volumes.  Highlights include:

·      Almost daily diagnosis of highly scaled production database issues that involve complex race conditions that led to system hangs, data corruption and Db2 crashes, and designed solutions without locking shared resources, improved system recovery without impacting performance.

·      Led and designed end-to-end solutions for several key projects that brought the database drivers up to industry standard. Projects included UNICODE and ASCII support, new ways of manipulating database data and new SQL data types and SQL statements.

·      Optimized the performance of the ODBC driver in data transfer to and from the database by up to 66% for data output and 32% for data input by implementing block fetch.

I had also worked as a full stack engineer for Tesla where I developed web APIs and front-end UI for various Logistics applications, that are used for vehicle shipment building and vehicle delivery tracking.



Technical Skills:

Languages: C, PL/X, Assembly, Java, Python, JavaScript, TypeScript

Web Development: REST APIs with C# and .Net, HTML, CSS, Angular, Node.js

Databases: DB2, MySQL

Concepts: Data Structures & Algorithms, Object Oriented Analysis & Design, Design Patterns

## Work Experience
### Software Engineer @ IBM
Jan 2023 – Present
Developed for the Agent Services component of Db2 z/OS which involves the creation, synchronization, and overall management of application and system agents that run in Db2.

Diagnosed on a daily basis synchronization issues that led to hung threads, entire system hangs, data corruption and Db2 crashes.  Designed solutions that eased the race conditions and improved recovery, all without impacting performance.

### Full Stack Engineer @ Tesla
Jan 2023 – Jan 2023 | California, United States
Developed web APIs and front end UI for various Logistics applications, used for vehicle shipment building and vehicle delivery tracking among others.

### Advisory Software Engineer @ IBM
Jan 2000 – Jan 2012 | San Jose, CA
Designed and implemented UNICODE and ASCII support for the ODBC database driver, making it available for the vast majority of products that do not use IBM specific character encoding.

Designed and implemented scrollable cursors for ODBC customers, allowing their screen-based applications to scroll forward and backward through the data.  This functionality allowed numerous ODBC applications to remain on the IBM platform.

Optimized the performance of the ODBC driver in data transfer to and from the database by 66% for output and 32% for input.

Delivered numerous features such as support for new SQL data types (XML, 64bit integers) and new SQL statements, to help with the growth of the DB2 customer base.

Principal engineer responsible for servicing time sensitive customer issues involving ODBC, resolving a wide range of customer issues including memory leaks, data corruption, application hangs, migration issues, performance issues, platform and standard inconsistencies. In each case, delivered quality fixes without regression to customers, which ranged from major banks such as Bank of America and Citibank; to insurance companies such as Aetna and Kaiser; to major manufacturers such as Deere & Co and Caterpillar; to US government agencies such as Homeland Security.

Assisted in the smooth migrations of customer applications across 5 DB2 releases without missing customer migration deadlines.


## Education
### Bachelor of Science - BS in Computer Science
University of Washington


## Contact & Social
- LinkedIn: https://linkedin.com/in/yunfei-xie

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Source: https://flows.cv/yunfeixie
JSON Resume: https://flows.cv/yunfeixie/resume.json
Last updated: 2026-04-01