Masayuki Takagi
Product Owner Software Engineer at UserRecord Inc.
Chiyoda, Japan
Summary
🤩
Rockstar🎓
Top SchoolMasayuki Takagi is a product-focused software engineer and founder with 14 years of experience building data-driven web products and ad-tech systems from Tokyo. He currently combines product ownership and hands-on engineering at Preferred Networks, bringing practical delivery discipline and a developer’s attention to quality. As founder and CEO of UserRecord he created user-behavior and online ad distribution systems, blending technical architecture with commercial execution. His background includes product design and full-stack development at beBit, and open-source contributions to high-profile projects like CuPy—where he improved GPU-backed NumPy functionality through targeted regression tests and bug fixes. Comfortable switching between strategy and code, he’s known for improving system reliability and shipping measurable product outcomes.
14 years of coding experience
8 years of employment as a software developer
Bachelor, Faculty of Engineering, Bachelor, Faculty of Engineering at 東京大学 / The University of Tokyo
English
Stackoverflow
442reputation
13kreached
2answers
8questions
Github Skills (16)
scipy10
c-language10
cprogramming-language10
python10
cupy10
testing10
cpp9
simd6
parallel-processing6
cuda6
applicative6
common-lisp6
gpgpu6
lisp6
package6
Programming languages (7)
Github contributions (5)
cupy/cupy
May 2017 - Jan 2023
NumPy & SciPy for GPU
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:8 releases, 1117 reviews, 1328 commits in 5 years 9 months
Contributions summary:Masayuki primarily focused on enhancing the stability and functionality of the project by implementing regression tests for the "unpooling_nd" functionality. Their contributions included adding tests to ensure the correctness of forward and backward computations. The user also fixed an import order issue and addressed a syntax error and a bug related to the use of `six.moves.zip`. Autopep8 was also utilized to maintain code quality.
cudapythoncusolvergpunumpy
takagi/cl-ply
Jul 2013 - May 2015
Contributions:46 commits, 5 pushes, 2 issues in 1 year 9 months
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