Qinxuan Chen
Earth, Texas, United States
Summary
🤩
RockstarQi Chen is a seasoned software engineer with 10+ years building large-scale, high-performance distributed systems and streaming platforms, currently at DoorDash in Sunnyvale. He has driven impactful projects at Uber (Flink-as-a-Service, dispatch microservices, UberPool efficiency) and contributed to infrastructure at LinkedIn, Amazon, and Microsoft, blending systems design with production-grade implementation. An active open-source contributor, Qi has made substantial backend and runtime changes to major Rust projects in the Polkadot/Substrate ecosystem and databases like TiKV and Databend, demonstrating deep expertise in low-level systems, Rust, and blockchain runtimes. He excels at scalable algorithms, stream processing, and data analytics, and is known for pragmatic migrations, dependency modernization, and robust error-handling refactors. Quick to learn and a strong collaborator, he pairs algorithmic rigor with hands-on debugging to deliver measurable efficiency gains (e.g., >10% UberPool improvements).
10 years of coding experience
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (54)
dependency-management10
parserator10
substrate10
parser10
runtimes10
clientside10
peer-to-peer10
atomics10
key-value10
configuration-management10
run-time10
frameset10
networking10
tikv10
refactor10
Programming languages (11)
Github contributions (5)
tikv/rust-prometheus
Apr 2019 - Aug 2020
Prometheus instrumentation library for Rust applications
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 6 PRs, 4 comments in 1 year 4 months
Contributions summary:Qinxuan primarily contributed to the `rust-prometheus` library by implementing improvements and addressing specific issues. They updated the code to use stabilized `std::atomic` types and `char::is_ascii` features, enhancing the library's compatibility and efficiency. The user also refactored error handling, replacing the `quick-error` crate with `thiserror` for better maintainability, and updated dependencies, specifically `reqwest`, to the 0.10 version.
instrumentationprometheus-exporterprometheus-instrumentation-libraryrustprometheus
paritytech/substrate
Nov 2019 - Dec 2022
Substrate: The platform for blockchain innovators
Role in this project:Back-end Developer
Back-end DeveloperContributions:57 reviews, 66 commits, 70 PRs in 3 years 1 month
Contributions summary:Qinxuan's contributions primarily involve updating dependencies within the Substrate framework, particularly focusing on libraries related to blockchain development. They updated multiple dependencies like `derive_more`, `strum`, and `slog_derive`, demonstrating a focus on keeping the project's dependencies up-to-date. The user also pruned some duplicate dependencies, such as `ed25519-dalek`, `hex`, and `parity-wasm` and replaced bitmask with bitflags, illustrating a good understanding of dependency management. Furthermore, the user updated some dependencies of `sc-network`. The user also migrated several pallets to the new pallet attribute macro, like `pallet-randomness-collective-flip`, `pallet-transaction-payment`, `pallet-treasury`, `pallet-mmr`, `pallet-tips`, `pallet-collective`, `pallet-membership`, `pallet-session`, and `pallet-referenda`, indicating a strong understanding of Substrate's internals.
substraterustblockchainparitypolkadot
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