Hiroko Mizuta - Japanese AI Trainer

Q: Where is Hiroko based?

Hiroko is based in Soja, Japan and prefers 100% remote projects.

Q: What languages does Hiroko speak?

Hiroko speaks the following languages: Japanese (Native), English (Advanced), Chinese (Intermediate) .

Q: How many years of experience does Hiroko have?

Hiroko has at least 21 years of experience. During this time, Hiroko has worked in at least 7 different roles and for 7 different companies . The average length of individual experience is 3 years . Note that Hiroko may not have shared all experience and actually has more experience.

Q: What is Hiroko's latest experience?

Hiroko's most recent position is Japanese AI Trainer at Freelance .

Q: What companies has Hiroko worked for in recent years?

In recent years, Hiroko has worked for Freelance , iKala Japan Inc. , REALITY, Inc. , and Warner Bros. Japan LLC .

Q: Which industries is Hiroko most experienced in?

Hiroko is most experienced in industries like Media and Entertainment , Retail , and Information Technology . Hiroko also has some experience in Advertising .

Q: Which business areas is Hiroko most experienced in?

Hiroko is most experienced in business areas like Marketing , Sales , and Product Development . Hiroko also has some experience in Quality Assurance .

Q: Which industries has Hiroko worked in recently?

Hiroko has recently worked in industries like Media and Entertainment , Information Technology , and Advertising .

Q: Which business areas has Hiroko worked in recently?

Hiroko has recently worked in business areas like Marketing , Sales , and Product Development .

Recommended expert

Soja, Japan

Check rate

Experience

Feb 2025 - Present

1 year 5 months

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.

Mar 2023 - Sep 2024

1 year 7 months

Japan

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.

Jul 2021 - Mar 2023

1 year 9 months

Japan

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.

Feb 2016 - Aug 2016

7 months

Japan

User Acquisition & Marketing

Bizar, Inc.

Managed marketing for B2B cloud service startup, including SEO, paid media, and social campaigns.

Jan 2014 - Dec 2021

8 years

Japan

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.

Jan 2011 - Dec 2013

3 years

Japan

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.

Jan 2005 - Dec 2011

7 years

Japan

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.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Media and Entertainment, Retail, Information Technology, and Advertising.

Media and Entertainment

Retail

Information Technology

Advertising

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Marketing, Sales, Product Development, and Quality Assurance.

Marketing

Sales

Product Development

Quality Assurance

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

Japanese

Native

English

Advanced

Chinese

Intermediate

Education

Apr 2001 - Mar 2005

Notredome Seishin University

Bachelor of Arts, Human Life and Science · Human Life and Science · Okayama, Japan

Statistics

Experience

Total positions 7

Experience in Media and Entertainment 9 y

Avg length 3 y 3 m

Longest experience 7 y 11 m

Global Experience

Countries worked in 1 (Japan)

Primary country Japan

Expertise

Recent roles Japanese AI Trainer, Senior Sales Manager, Biz Dev & Marketing

Main industries Media and Entertainment, Retail, Information Technology

Main business areas Marketing, Sales, Product Development

Qualifications

Highest degree Bachelor

Profile

Created

November 2025

Last Update

November 2025

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Frequently asked questions

Have questions? Find more information here.

Where is Hiroko based?

Hiroko is based in Soja, Japan and prefers 100% remote projects.

What languages does Hiroko speak?

Hiroko speaks the following languages: Japanese (Native), English (Advanced), Chinese (Intermediate).

How many years of experience does Hiroko have?

Hiroko has at least 21 years of experience. During this time, Hiroko has worked in at least 7 different roles and for 7 different companies. The average length of individual experience is 3 years. Note that Hiroko may not have shared all experience and actually has more experience.

What roles would Hiroko be best suited for?

Based on recent experience, Hiroko would be well-suited for roles such as: Japanese AI Trainer, Senior Sales Manager, Biz Dev & Marketing.

What is Hiroko's latest experience?

Hiroko's most recent position is Japanese AI Trainer at Freelance.

What companies has Hiroko worked for in recent years?

In recent years, Hiroko has worked for Freelance, iKala Japan Inc., REALITY, Inc., and Warner Bros. Japan LLC.

Which industries is Hiroko most experienced in?

Hiroko is most experienced in industries like Media and Entertainment, Retail, and Information Technology. Hiroko also has some experience in Advertising.

Which business areas is Hiroko most experienced in?

Hiroko is most experienced in business areas like Marketing, Sales, and Product Development. Hiroko also has some experience in Quality Assurance.

Which industries has Hiroko worked in recently?

Hiroko has recently worked in industries like Media and Entertainment, Information Technology, and Advertising.

Which business areas has Hiroko worked in recently?

Hiroko has recently worked in business areas like Marketing, Sales, and Product Development.

What is Hiroko's education?

Hiroko holds a Bachelor in Human Life and Science from Notredome Seishin University.

What is the availability of Hiroko?

Hiroko is immediately available part-time for suitable projects.

What is the rate of Hiroko?

Hiroko's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.