- 🔬 Research: Investigating the empirical impact of test-code refactoring
- 🎓 Current: D1 @ NAIST
- 💡 Interests: Software Testing / Refactoring / Code Quality
- 🔍 Looking for: Research internship opportunities (2026-2027)
Agentic Refactoring: An Empirical Study of AI Coding Agents
Kosei Horikawa, Hao Li, Yutaro Kashiwa, Bram Adams, Hajimu Iida, Ahmed E. Hassan
arXiv:2511.04824 (2026)How Does Test Code Differ From Production Code in Terms of Refactoring? An Empirical Study
Kosei Horikawa, Yutaro Kashiwa, Bin Lin, Kenji Fujiwara, Hajimu Iida
ICSME 2025 (NIER Track)
Do AI Agents Really Improve Code Readability?
Kyogo Horikawa, Kosei Horikawa, Yutaro Kashiwa, Hidetake Uwano, Hajimu Iida
arXiv:2603.13723 (2026)Testing with AI Agents: An Empirical Study of Test Generation Frequency, Quality, and Coverage
Suzuka Yoshimoto, Shun Fujita, Kosei Horikawa, Daniel Feitosa, Yutaro Kashiwa, Hajimu Iida
arXiv:2603.13724 (2026)An Empirical Investigation into Maintenance of Load Testing Scripts
Ibuki Nakamura, Kosei Horikawa, Brittany Reid, Yutaro Kashiwa, Hajimu Iida
ESEM 2025 (ERVT Track)
| Year | Award |
|---|---|
| 2025 | 🥇 Best International Poster Award, IPSJ/SIGSE Software Engineering Symposium |
| Period | Institution | Role |
|---|---|---|
| Sep 2025 – Nov 2025 | 🇨🇦 Queen's University | Visiting Student |
| Jun 2025 – Jul 2025 | 🇨🇳 Hangzhou Dianzi University | Visiting Student |
| Sep 2024 – Nov 2024 | 🇳🇱 Radboud University | Visiting Student |
| Period | Company | Role |
|---|---|---|
| Mar 2025 – Apr 2025 | 🇯🇵 Recruit Co., Ltd. | Part-time QA Engineer |
| Nov 2024 – Dec 2024 | 🇯🇵 Recruit Co., Ltd. | QA Engineer Intern |
| Year | Institution | Program |
|---|---|---|
| 2026- | Nara Institute of Science and Technology (NAIST) | Doctoral, Information Science |
| 2024-2026 | Nara Institute of Science and Technology (NAIST) | Master's, Information Science |
| 2022-2024 | NIT, Nara College | Bachelor's, Information Systems |
| 2017-2022 | NIT, Nara College | Associate Degree, Information Engineering |
| Purpose | Technologies |
|---|---|
| Research & Analysis | |
| Development | |
| Exploring |
- GitHub: @Mont9165



