Satoshi Sakaguchi, a CPA, brings extensive experience in financial audit, investment, and corporate management. As CFO of TIER IV since 2018, he oversees finance and administration. He holds a BEc from Kyoto University.

Hironori Muraoka joined TIER IV as CHRO in 2025. Bringing a wealth of expertise in public relations, marketing, quality assurance, legal affairs, and risk compliance, he has held senior HR positions at Hitachi, PwC Japan, and Rakuten Group. Hironori holds a degree in Literature from Kyoto University and is a certified labor and social insurance attorney.

As CIO, Naomitsu Tsugiiwa leads efforts to strengthen TIER IV’s information systems and security structure and establish a company-wide risk management system. Before joining TIER IV, Naomitsu served as CTO at a startup. Naomitsu also held roles at Yahoo Japan, where he led mobile app development and security infrastructure, at KONAMI overseeing global game expansion, and at Microsoft working on software development tools QA and multimedia software.

As COO, Ko Miyoshi leads business and product development for autonomous driving solutions domestically and internationally. He joined TIER IV in 2020, bringing expertise in infrastructure projects and private equity. He holds an MBA from Harvard Business School and an LLB from Keio University.

Masashi Shinkai is responsible for leading strategic investment projects and building alliances with new partners to drive TIER IV’s growth and sustainable development. Through partnerships across industry, government, and academia, he promotes efforts to accelerate the deployment of autonomous driving technology. Before joining TIER IV in 2023, he worked at a major insurer, where he led collaboration initiatives with automotive firms.

Yoshihito Takashima holds degrees in computer science and mathematics, bringing extensive experience in large-scale 0-to-1 production environments from his tenures at Microsoft and Amazon/AWS headquarters. As CTO at TIER IV, he oversees the entire R&D unit, spearheading both business and technical innovations to meet the demands of a rapidly scaling autonomous vehicle ecosystem.