Chun-han Hsiao
Senior Software Engineer at Diffbot
New Taipei, Taiwan
Summary
🤩
Rockstar🎓
Top SchoolChun-han Hsiao is a Senior Software Engineer with 11 years of experience building high-performance, low-latency web and distributed systems from Taiwan. He excels in backend engineering using Java, Python, JavaScript and Go, and has a proven track record of optimizing throughput for large-scale crawling and query systems such as the proxy and query engine built at Diffbot. An active open-source contributor, Chun-han has improved core projects like Trino, Netty, and mitmproxy—adding secure S3 IAM role support, hardening HTTP/2 handling, and enhancing TLS/connection diagnostics. He has migrated and simplified production stacks by rewriting services in Go to reduce resource usage and operational complexity. Comfortable across data connectors, networking, and test automation, he brings both pragmatic engineering and attention to robustness and observability. Based in New Taipei, he combines deep protocol-level fixes with product-facing features that make distributed systems more secure and maintainable.
11 years of coding experience
9 years of employment as a software developer
Bachelor of Engineering (BE), Computer Science, Bachelor of Engineering (BE), Computer Science at National Central University
Chinese, English
Stackoverflow
271reputation
37kreached
13answers
0questions
Github Skills (46)
unit-testing10
ssl10
tls1210
software-design10
netty10
python10
testing10
amazon-elasticsearch10
http10
object-oriented-programming10
software-quality10
tls1310
java10
security10
javas10
Programming languages (10)
Github contributions (5)
modelmapper/modelmapper
Oct 2016 - Dec 2022
Intelligent object mapping
Role in this project:
Back-end Developer
Back-end DeveloperContributions:226 commits, 215 PRs, 307 pushes in 6 years 3 months
Contributions summary:Chun-han focused on improving the ModelMapper library, primarily by addressing bugs and implementing new features. Their work included fixing issues related to the skip property, converter usage, and circular reference detection. They also improved core functionalities by modifying the mutator pattern, and introducing the ability for TypeMap inheritance. Furthermore, they added support for new APIs such as lambda friendly api.
objectmappermappingmapperobject-mappingintelligent
netty/netty
Jan 2017 - Aug 2021
Netty project - an event-driven asynchronous network application framework
Role in this project:Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:1 review, 8 commits, 9 PRs in 4 years 8 months
Contributions summary:Chun-han primarily focused on improving the HTTP/2 implementation within the Netty framework. Their contributions involved fixing protocol violations related to header handling and unknown frames, which improved the robustness of the HTTP/2 implementation. The user also added and extended unit tests for both the `DefaultHttp2FrameReader` and `DefaultHttp2FrameWriter` to increase coverage, demonstrating a focus on testing and code quality. Furthermore, the user implemented support for clear text HTTP/2 upgrades and addressed a memory leak issue.
asynchronousasynchronous-networknionettyapplication-framework
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