Experience

Research Internships

Hakuhodo Technologies / Research Intern (Apr 2022 - Sep 2022)

• Towards Assessing and Benchmarking Risk-Return Tradeoff of Off-Policy Evaluation (ICLR 2024)
• Internship Blog (Qiita), Co-developed Library SCOPE-RL

Yahoo! JAPAN Research (LINE Yahoo) / Research Intern (May 2023 - Present)

• Efficient Offline Learning of Ranking Policies via Top-k Policy Decomposition (ARLET@ICML 2024)
• Off-Policy Learning with Limited Supply (TheWebConf 2026)

CyberAgent AI Lab / Research Intern (Jan 2024 - Jan 2026)

• Effective Off-Policy Evaluation and Learning in Contextual Combinatorial Bandits (RecSys 2024)
• Beyond Match Maximization and Fairness: Retention-Optimized Two-Sided Matching (ICLR 2026)
• Objective-driven Calibrated Recommendations (preprint)

Hanjuku Kaso Co., Ltd. (Half-Baked Virtual) / Research Intern (Mar 2024 - Present)

• Offline Contextual Bandits with New Actions (KDD 2025 Workshop on Causal Inference)

Data Science / Engineering Internships

SOZOW Inc. / Programming Mentor (Apr 2022 - Jun 2023)

• Mentored K-12 students in programming and created learning content.

CyberAgent ABEMA / Data Scientist (May 2025 - Jul 2025)

• Improved ranking of content modules on the home screen.

DeNA / Data Scientist (Sep 2025)

• Analyzed catcher throwing for DeNA BayStars.
  • Blog Post

Recruit SUMO / Data Scientist (Oct 2025 - Nov 2025)

• Improved ranking on the home screen of the Android app.