Hanjoung Lee
Senior Developer at SAP
Seoul, South Korea
Summary
🤩
RockstarHanjoung Lee is a Senior Developer based in Seoul with 11 years of experience designing and optimizing high-performance back-end systems and cloud data engines. At SAP he focuses on HANA kernel performance, large-scale import/export, and tuning SQL-on-files (Parquet) and hyperscaler storage integrations, while also building tooling for supportability. He is a pragmatic problem-solver with deep object-oriented design skills and a track record of fixing subtle engine-level bugs in embedded and runtime projects. His open-source contributions include core bug fixes and tests for the ultra-lightweight JerryScript engine and network/DNS features for IoT.js, plus robustness work on Samsung’s on-device Neural Engine—demonstrating a knack for low-level correctness and production reliability. Colleagues rely on him to make fragile systems more resilient and to translate complex platform issues into repeatable fixes.
10 years of coding experience
Stackoverflow
2,133reputation
48kreached
59answers
0questions
ascii
top-1%
bit-manipulation
top-5%
Github Skills (33)
parserator10
javascript10
c-language10
parser10
lexer10
testing10
networking10
iot10
tensorflow10
javascript-engine10
sys10
ascii10
neural-network10
embedded10
cprogramming-language10
Programming languages (6)
Github contributions (5)
jerryscript-project/jerryscript
Aug 2015 - Aug 2016
Ultra-lightweight JavaScript engine for the Internet of Things.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:263 commits, 24 PRs, 258 pushes in 1 year
Contributions summary:Hanjoung primarily focused on bug fixes and improvements to the JavaScript engine's core functionality. Their contributions include fixing parsing errors related to regular expressions and division operators, switch statements, and return statements. They also addressed issues with property name resolution and the `[[HasInstance]]` operation for external functions, while also adding tests to ensure these issues are resolved.
javascript-enginejerryscriptjavascriptruntimeultra
Samsung/ONE
Apr 2020 - Mar 2021
On-device Neural Engine
Role in this project:Back-end Developer
Back-end DeveloperContributions:398 reviews, 394 commits, 933 PRs in 11 months
Contributions summary:Hanjoung primarily contributed to the on-device Neural Engine project by modifying and testing the code related to its core functionality. Their commits involved revising the backend loading policy to handle potential failures gracefully and updating testing procedures for multi-session capabilities. They also made changes related to model loading, including addressing issues with invalid model formats, and implemented methods for setting input and output tensor information.
on-device-aion-deviceoptimizationruntimeneural-engine
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