Lingzhi Deng - Lead Engineer at MongoDB

Lingzhi Deng

Lead Engineer at MongoDB

New York City Metropolitan Area United States

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Summary

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Rockstar

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Top School

Lingzhi Deng is a Lead Engineer in the New York City area with 10 years of experience specializing in database engines. At MongoDB she drives core replication and write-concern work and has advanced through senior technical roles, while her prior work at Bloomberg improved schema-change robustness for comdb2, Bloomberg’s distributed RDBMS. She’s a pragmatic systems engineer known for tackling hairy production issues—handling transactional constraints, adding thorough test coverage, and fixing memory leaks and edge-case bugs that improve real-world reliability. An active contributor to high-profile open-source database projects, she blends deep low-level expertise with product-minded engineering.

10 years of coding experience

6 years of employment as a software developer

University of Waterloo

Github Skills (21)

c-language10

databases10

schema-design10

database-administration10

mongodb-database10

schema-org10

sql10

database-design10

replication10

schema10

mongodb10

concurrency10

c-programming-language10

database10

concurrent9

Programming languages (4)

C++ShellCPython

Github contributions (5)

bloomberg/comdb2

May 2017 - Mar 2019

Bloomberg's distributed RDBMS

Role in this project:

Back-end Developer / Database Engineer

Contributions:139 commits, 254 PRs, 120 pushes in 1 year 10 months

Contributions summary:Lingzhi primarily contributed to the database and schema change components. Their work focused on improving the efficiency and robustness of schema changes, including handling constraints within transactions. They implemented logic to handle different scenarios in the schema change process and added test cases to ensure correct behavior. The user also made various improvements to database functionality and solved several memory leaks and other bugs.

bloombergdatabaserdbmsdistributed

mongodb/mongo

Mar 2019 - Jan 2023

The MongoDB Database

Role in this project:

Database Engineer / Database Administrator

Contributions:2 reviews, 416 commits, 4 PRs in 3 years 10 months

Contributions summary:Lingzhi's contributions focused on implementing a future-based API for waiting for write concern, as well as other database level improvements. This primarily involved modifying and adding new methods to the `ReplicationCoordinatorImpl` class. Their work included changes to handle errors in different scenarios, such as during startup or when dealing with multi-document transactions. The user's commits centered around ensuring the robustness of the MongoDB database's replication and write concern mechanisms.

nosqlc-plus-plusmongodb-databasedatabasemongodb

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