Sadayuki Furuhashi
Chief Architect at Treasure Data
Tokyo, Japan
Summary
🤩
Rockstar🎓
Top SchoolSadayuki Furuhashi is a Chief Architect based in Tokyo with 17 years of experience designing high-performance distributed systems and developer-facing infrastructure. He founded and authored widely used open-source projects including MessagePack and Fluentd, technologies adopted by major services and the CNCF ecosystem. At Treasure Data he progressed from Founder & Architect to Chief Architect, driving scalable data platform architecture while previously holding senior engineering roles at Arm. His hands-on contributions span core systems work—from reworking MessagePack internals to improving Presto’s locale-aware date handling and Digdag secrets management—demonstrating depth in serialization, logging, and query engines. Known for pragmatic optimizations and careful correctness fixes, he blends low-level C/C++/Java work with production-ready cloud integrations (S3, Fluentd plugins). He holds a Master’s in Information Science from the University of Tsukuba and consistently bridges academic rigor with production impact.
17 years of coding experience
12 years of employment as a software developer
Master, Information Science, Master, Information Science at University of Tsukuba
English, Japanese
Stackoverflow
2,286reputation
82kreached
1answer
0questions
serialization
top-1%
Github Skills (55)
algorithm10
json10
algorithms10
datetime10
serializable10
c-language10
serializer10
data-collection10
back-end-development10
testing10
plugin-development10
configuration-management10
databases10
data-serialization10
c1110
Programming languages (13)
Github contributions (5)
msgpack-rpc/msgpack-rpc
Oct 2009 - Oct 2012
MessagePack-RPC is an inter-process messaging library that uses MessagePack for object serialization.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:202 commits in 3 years
Contributions summary:Sadayuki primarily worked on implementing MessagePack-RPC functionality within the repository. Their contributions included implementing asynchronous return for RPC calls, modifying the core RPC library, and adding test cases to ensure proper functionality. Furthermore, the user was also involved in fixing Ruby 1.9 test cases and updates related to error handling and exception management.
messagepackobject-serializationrpc
msgpack/msgpack
Feb 2009 - Aug 2017
MessagePack is an extremely efficient object serialization library. It's like JSON, but very fast and small.
Role in this project:Back-end Developer
Back-end DeveloperContributions:410 commits, 7 PRs, 7 pushes in 8 years 7 months
Contributions summary:Sadayuki made changes to the core implementation of a message serialization library, `msgpack`. The user's primary contribution was a rewrite of `msgpack::object::via`, indicating a focus on improving the internal data structures and data handling of the library. This involves modifying header files, and source files and shows the user working on the core of the library's functionality.
messagepackobject-serialization
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