Hiroko Mizuta
Japanese AI Trainer
Experience
Japanese AI Trainer
Freelance
- Conduct Japanese linguistic evaluation and training to enhance AI model accuracy and fluency.
- Analyze model errors, provide structured feedback, and support prompt engineering improvements.
Senior Sales Manager
iKala Japan Inc.
- Expanded KOL Radar, an AI-powered influencer search platform, in Japan.
- Signed 2 new agency partnerships; achieved 225% YoY growth in active SaaS accounts.
- Conducted market research to localize sales strategies for Japanese clients.
Biz Dev & Marketing
REALITY, Inc.
- Managed IP collaborations to improve REALITY App and boost sales.
- Oversaw planning, budgeting, and coordination with cross-functional teams and IP holders.
- Achieved 242% of global target sales through major IP collaboration.
User Acquisition & Marketing
Bizar, Inc.
- Managed marketing for B2B cloud service startup, including SEO, paid media, and social campaigns.
Marketing Coordinator
Warner Bros. Japan LLC
- Managed IP marketing for Harry Potter, Tom & Jerry, DC Comics, and others.
- Led licensing projects and digital content creation (LINE stickers/themes).
- Achieved multiple #1 sales rankings on LINE digital content.
Account Manager / Media Planner
GREE, Inc.
- Developed strategic partnerships with game developers; managed mobile app advertising campaigns.
- Achieved 43% of total advertising division sales; awarded Monthly MVP twice consecutively.
Group Leader / EC Consultant
Rakuten, Inc.
- Supported merchants on Rakuten Ichiba, planned sales campaigns, and led key clients to achieve Rakuten Shop of the Year awards.
- Consistently met sales targets for 40 consecutive months.
Summary
AI Trainer (Freelance): Currently working as a Japanese AI Trainer on multiple projects, including text and speech, contributing to improving AI models’ Japanese language performance through training, testing, and performance optimization.
Business Development & Sales: Led the new business development efforts for an AI-powered marketing tool, driving market expansion and fostering strategic partnerships to accelerate business growth at iKala Japan.
Account Management: Over 6 years, successfully contributed to sales growth, expanded marketing efforts, and developed strong client relationships as an Account Manager at Rakuten and GREE.
Marketing Strategy: Possess extensive experience in digital and offline marketing, social media management, and public relations, contributing to various successful marketing campaigns.
Project Management: Demonstrated expertise in coordinating cross-functional teams and managing projects, ensuring effective collaboration and timely delivery.
Brand Management: Managed well known IP/Brands in Warner Bros. for 6 years, i.e. Harry Potter, Tom & Jerry, DC Comics, The Lego Batman Movie etc.
Skills
- Japanese Linguistics & Syntax Analysis
- Ai Training & Prompt Evaluation
- Saas & Digital Marketing
- Project Management & Cross-functional Coordination
- Brand & Ip Management
Languages
Education
Notredome Seishin University
Bachelor of Arts, Human Life and Science · Human Life and Science · Okayama, Japan
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