Kenshin Sakaguchi

AI data specialist and linguistic expert with hands-on experience across a diverse range of AI training projects, including transcription, multimodal annotation, LLM evaluation, translation and localization. Promoted to QA Reviewer across many projects and recognized as an elite contributor by Outlier, demonstrating a strong record of high performance.

Native

Japanese speaker with strong professional English proficiency and deep localization expertise, bringing linguistic precision to the evaluation of LLM-generated content for naturalness and cultural authenticity. Known for meticulous attention to detail, adaptability to evolving project requirements, and consistently delivering high-quality work.

Data Annotation & Transcription Expert (Freelance) 2025-09 – Present

• Hands-on experience in text, image, audio and cross-modal annotation tasks.
• Transcribed complex, multi-speaker audio files with high accuracy, working across challenging recordings with background noise, overlapping speech, and varied accents.
• Promoted to QA Reviewer within days of starting across multiple projects, recognized for exceptional attention to detail and consistency in high-volume workflows.
• Ranked in the top 3% of contributors, consistently delivering accurate, actionable feedback that met the highest quality benchmarks

AI Data Evaluation & QA Expert (Freelance) 2024-09 – Present

• Evaluated and ranked AI-generated outputs across multiple RLHF projects, providing detailed feedback on reasoning quality, instruction-following, factual accuracy, and coherence.
• Reviewed AI-generated content across text, audio, and visual modalities, applying structured rubrics to assess quality, clarity, and overall user experience.
• Handled diverse tasks including prompt crafting, response comparison, adversarial testing, and multi-turn dialogue evaluation, drawing on linguistic and localization expertise to assess naturalness and cultural authenticity.
• Reviewed submissions from annotators, identified subtle edge cases and inconsistencies, and provided constructive feedback to ensure strict adherence to project standards.
• Recognized by Outlier for sustained high-quality contributions and invited to join the exclusive Oracle program, a designation reserved for elite contributors.

Translator & Linguistic Expert (Freelance) 2016-06 – Present

• Translated and localized articles from English to Japanese across specialized domains including blockchain and crypto content, and religious content, ensuring accuracy and natural readability.
• Localized English video content for the Japanese market, producing subtitle scripts with precise timing synchronization, cultural adaptation, and optimal readability.

Ritsumeikan Asia Pacific University, Business Administration (Apr 2016 – Mar 2020)