Runji Wang
Software Engineer at DeepSeek AI
Beijing, Beijing, China
Summary
🤩
Rockstar🎓
Top SchoolRunji Wang is a software engineer based in Beijing with 10 years' experience building low-level systems in Rust, including operating systems, storage, databases, and stream processing platforms. At RisingWave Labs he helped harden the stream processing engine—authoring memcomparable serialization, designing a macro-driven expression framework, and building Madsim, a deterministic simulator that uncovered concurrency bugs in distributed systems. His open-source work spans rCore and Occlum, where he fixed kernel-level bugs and implemented filesystem syscalls, reflecting deep systems and OS-level expertise. Comfortable bridging research and production, he also implemented diverse UDF runtimes (Rust/WASM, Python, Java, JavaScript) and contributed CI and core type work for educational OLAP projects. Unusually for a systems engineer, he blends pragmatic tooling (testing, CI, simulators) with language-level design to make complex distributed behaviors reproducible and debuggable.
10 years of coding experience
Master's degree, Computer Science and Technology, Master's degree, Computer Science and Technology at 清华大学高中, 高中 at 北京师范大学附属实验中学
Stackoverflow
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Github Skills (34)
filesystem10
datatypes10
back-end-development10
risc-v10
memory-management10
data-serialization10
os-development10
serialization10
deserialization10
system-calls10
database-design10
rust10
operating-system10
testing9
data-structure9
Programming languages (17)
Github contributions (5)
risinglightdb/risinglight
Aug 2021 - Jan 2023
An educational OLAP database system.
Role in this project:
Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:166 reviews, 88 commits, 145 PRs in 1 year 4 months
Contributions summary:Runji contributed to the educational OLAP database system by addressing compile errors and adding a continuous integration (CI) system. They improved code style, particularly within the catalog and type definition modules, and implemented core data type functionality. Furthermore, the user simplified data types by using enums instead of structs and implemented the transformer for create-table and insert statements.
analyticsembedded-databaserustolapsql
rcore-os/rCore
Dec 2018 - Jun 2020
Rust version of THU uCore OS. Linux compatible.
Role in this project:Back-end Developer
Back-end DeveloperContributions:3 releases, 2 reviews, 265 commits in 1 year 6 months
Contributions summary:Runji primarily focused on debugging and optimizing the RISC-V32 kernel, addressing an overflow issue in the `__mulsi3` function. They also introduced and refactored the `MemoryHandler` and `MemorySet` modules, with related modifications in paging and memory areas. Additionally, the user implemented the `/proc/self/exe` pseudo inode to store the path of the executable file.
linux-osriscvrustlinuxthu
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