Liwei Cai
Software Engineer at Headlands Technologies LLC
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolLiwei Cai is a Senior Software Engineer with 11 years of experience building production-scale deep learning systems and distributed data pipelines, currently focused on AI at LinkedIn. He has driven measurable impact across ads and conversational AI—improving CTR models by 1–2% at LinkedIn and reducing Alexa NLU error and dissatisfaction rates through contextual end-to-end models at Amazon. Comfortable spanning research and engineering, he has published NAACL work on adversarial training for knowledge graphs, prototyped models in MXNet/PyTorch, and implemented serving and pipeline components in C++, Python, and Spark. An active open-source contributor, he has improved symbolic math behavior in the widely used sympy project, reflecting strong algorithmic and numerical instincts beyond NLP. Trained at Tsinghua and CMU, he combines rigorous academic foundations with a knack for shipping robust, scalable ML systems.
11 years of coding experience
4 years of employment as a software developer
Bachelor of Engineering (B.E.), Electronic Information Science and Technology, 89/100, Bachelor of Engineering (B.E.), Electronic Information Science and Technology, 89/100 at Tsinghua UniversityMaster of Science - MS, Intelligent Information Systems (School of Computer Science), 3.95/4.33, Master of Science - MS, Intelligent Information Systems (School of Computer Science), 3.95/4.33 at Carnegie Mellon University
Chinese, English, Japanese, Chinese
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (9)
mathematics10
finite-field10
symbolic-math10
computer-algebra10
rational-numbers10
math10
python10
computer-algebra-system10
testing9
Programming languages (7)
Github contributions (5)
sympy/sympy
Apr 2023 - Apr 2023
A computer algebra system written in pure Python
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1 review, 1 PR, 6 comments in 11 days
Contributions summary:Liwei primarily contributed to the `sympy/sympy` repository by modifying and enhancing the continued fraction functionality and implementing exact square root features for various mathematical domains within the computer algebra system. The user refactored code, addressed suggestions from code style checkers, and ensured the correct behavior of mathematical operations in the context of the repository's focus on symbolic mathematics. They implemented improvements to the finite field domain.
computer-algebra-systempythonmathcomputer-algebrascience
cai-lw/competitive-programming
Feb 2022 - Mar 2022
Contributions:24 commits, 67 pushes, 2 branches in 1 month
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