James Lan
Senior Software Engineer at Apple
San Jose, California, United States
Summary
👤
Senior🎓
Top SchoolJames Lan is a Senior Software Engineer in San Jose with over a decade of experience building large-scale, distributed systems and high-performance backend services across companies like Apple, LinkedIn, Google, Yahoo, and Magic Leap. He combines deep multi-language expertise (Python, Java, C++, C#, JavaScript/TypeScript) with strong data engineering skills for storing, processing, and migrating big data at scale. James has led cloud-based SLAM and perception mapping efforts, designed distributed RESTful analytics platforms, and improved cross-datacenter replication and CI pipelines, demonstrating both technical depth and operational rigor. An active open-source contributor, he has optimized performance-critical code in projects such as python-betterproto and improved core behaviors in IronPython3, showing a knack for subtle metadata and deserialization optimizations. Trained in mechanical engineering and computer science at Tsinghua University, he learns new technologies quickly and excels at turning complex requirements into reliable, maintainable systems.
13 years of coding experience
13 years of employment as a software developer
Bachelor of Science (BS), Mechanical Engineering, Bachelor of Science (BS), Mechanical Engineering at Tsinghua University
Chinese, English
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (16)
asyncio10
netframework10
code-generation10
csharp10
python10
ironpython10
grpc10
protocol-buffers10
dotnet-core10
typehinting9
testing9
data-structure9
type-checking9
data-structures9
code-optimization9
Programming languages (13)
Github contributions (5)
danielgtaylor/python-betterproto
May 2020 - Jun 2020
Clean, modern, Python 3.6+ code generator & library for Protobuf 3 and async gRPC
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 5 PRs, 23 comments in 28 days
Contributions summary:James primarily focused on optimizing the `python-betterproto` library, which is a code generator and library for Protobuf and gRPC. Their contributions involved improving performance through caching mechanisms, specifically related to field metadata and class lookups during deserialization. These changes included storing class metadata like field types and default value generators, along with various refinements to the code's efficiency, resulting in improved performance. Further adjustments to the enum and field type handling, coupled with test additions, highlight a focus on ensuring the library's accuracy.
pythonasyncioprotobufpython-3-6grpc
IronLanguages/ironpython3
Jun 2020 - Aug 2020
Implementation of Python 3.x for .NET Framework that is built on top of the Dynamic Language Runtime.
Role in this project:Back-end Developer
Back-end DeveloperContributions:1 review, 9 commits, 9 PRs in 2 months
Contributions summary:James primarily contributed to the IronPython3 project by addressing bugs and implementing improvements related to core Python functionality. Their work involved modifying existing code in files such as `Builtin.cs`, `PythonList.cs`, and `LongOps.cs` to refine the behavior of methods like `sorted`, `readall`, and division operations. Furthermore, the user enabled tests and modified the testing infrastructure. These changes focused on improving the accuracy and performance of IronPython's core functionalities.
dotnetpythonironpythondlrnet-framework
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