About OpenTrain OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. Our mission is to connect people with real work that teaches AI systems — from document annotation to evaluation — while helping contributors grow long-term careers in this fast-growing field. About AI training work AI training (also called data labeling or annotation) is the human side of building machine learning systems. Tasks range from marking up images and documents to correcting OCR text and reviewing model outputs. This project focuses on document-level annotation — a behind-the-scenes but essential role that shapes how AI understands Japanese text and layouts. The role We are hiring native Japanese speakers based in Japan to join a PDF annotation and QA project as contractors. Annotators will mark up document layouts, correct OCR text, and create HTML-based table descriptions. QA Reviewers will check completed annotations for accuracy and provide actionable feedback. This is remote work with ongoing work available based on performance. What you'll do

• Draw bounding boxes around document elements: text blocks, tables, figures, headers, captions.
• Classify elements using predefined annotation categories and apply hierarchical relationships.
• Verify and correct OCR-generated Japanese text for accuracy and readability.
• Create simple HTML-based descriptions for tables to preserve structure and content.
• Ensure correct reading order and logical relationships between annotated elements.
• QA Reviewers: review completed annotations, check conformity to guidelines, and provide feedback.

Requirements

• Native Japanese speaker with professional-level reading and writing.
• Currently located in Japan and able to work from Japan.
• Basic English proficiency (B1 or higher) for reading platform instructions.
• Strong attention to detail and ability to follow detailed guidelines consistently.
• Reliable internet connection and ability to meet deadlines while working independently.
• Can start within 3 business days of notification and complete an initial 2–3 hour pilot.
• Comfortable annotating PDFs using bounding boxes and applying reading order/hierarchy.

Preferred qualifications

• Experience with document annotation, data labeling, transcription, or structured QA work.
• Familiarity with technical, financial, or legal documents (useful but not required).
• Basic HTML knowledge for creating table descriptions.
• Previous experience as a QA reviewer for annotation projects is a plus.

Pay, schedule, and project details Compensation is hourly: annotators are paid $18/hour (USD) and QA reviewers $20/hour (USD). This is contractor work; you will be paid per hour for accepted tasks. Initial pilot: a 2–3 hour paid pilot to evaluate fit and quality. Production: flexible hours with potential ongoing assignments for qualified contributors. The project involves document data (PDFs) and tasks include bounding boxes, classification, text correction, and evaluation. How to apply Create a free OpenTrain account and apply through the project listing. In your application, confirm you are located in Japan, state whether you are applying as an Annotator or QA Reviewer, and list any relevant experience with document annotation, OCR correction, or HTML. Applicants should be available to begin within three business days of notification and to complete the paid 2–3 hour pilot. If selected, you will receive project guidelines and access to the annotation platform.