Hangjie Mo
Database Engineer
Hangzhou City, Zhejiang, China
Summary
🤩
Rockstar🎓
Top SchoolHangjie Mo is a Database Engineer with a decade of systems and backend experience, blending a BME background from Zhejiang University with a 3.9/4.0 MS in Computer Engineering from Northwestern. After building high-performance network stacks and RPC frameworks at Alibaba Cloud, he now contributes to core components of cloud-native distributed databases at PingCAP, including TiKV and TiDB. His open-source work spans critical fixes and feature additions—such as UTF-8 handling, index scanning improvements, and TiKV client enhancements—demonstrating attention to correctness and performance at scale. Comfortable in Go, Rust, and C/C++, he focuses on query planning, hash joins, and test infrastructure migration to improve maintainability and reliability. Colleagues value his ability to translate deep systems knowledge into production-ready database features and subtle bug fixes that materially improve system behavior.
10 years of coding experience
3 years of employment as a software developer
Master's degree, Computer Engineering, 3.9/4.0, Master's degree, Computer Engineering, 3.9/4.0 at Northwestern UniversityBachelor's degree, Biomedical/Medical Engineering, 3.76/4.00, Bachelor's degree, Biomedical/Medical Engineering, 3.76/4.00 at Zhejiang University
Github Skills (28)
go-modules10
key-value10
testing10
databases10
query-optimization10
tikv10
go10
distributed-transactions10
rust10
relational-databases10
sql-database10
database10
admin9
git9
database-administration9
Programming languages (11)
Github contributions (5)
pingcap/tidb
Aug 2021 - Jan 2023
TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1963 reviews, 120 commits, 488 PRs in 1 year 5 months
Contributions summary:Hangjie's commits primarily focused on refactoring and migrating test infrastructure in the TiDB project. The changes included migrating test infrastructure to `testify` for various components like `sessionctx/stmtctx`, `sessionctx/binloginfo` and `br/pkg/rtree`. Additionally, the user updated the `main.go` file in `tidb-server` to set `mysql.ServerVersion` and `variable.Version` to the configured `ServerVersion`. These contributions indicate a focus on code maintainability and server configuration.
agentictidbvector-searchdistributed-databasedistributed-transactions
tikv/client-go
Jul 2022 - Nov 2022
Go client for TiKV
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 reviews, 5 commits, 10 PRs in 4 months
Contributions summary:Hangjie primarily contributed to the TiKV client-go repository by updating dependencies and implementing new features. They updated the go.mod file to use the latest versions of various libraries, including `pd/client` and `kvproto`. The user added support for the `kv_prepare_flashback_to_version` command and fixed tests within the project. Additionally, they addressed a bug in the `getMinSafeTSByStores` function, and updated the GCTimeFormat variable.
gotikv
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