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Hi, I'm Guillaume Duchateau, a Multilingual AI Trainer specializing in LLM fine-tuning, evaluation, and multilingual data quality. I help ensure accurate, culturally relevant data for AI systems. With over 13 years in Big Tech, I have managed knowledge graphs and linguistic data workflows that power AI/ML solutions. I train and assess models in English and French, focusing on data quality, reliability, and user-centric outcomes.…Hi, I'm Guillaume Duchateau, a Multilingual AI Trainer specializing in LLM fine-tuning, evaluation, and multilingual data quality. I help ensure accurate, culturally relevant data for AI systems. With over 13 years in Big Tech, I have managed knowledge graphs and linguistic data workflows that power AI/ML solutions. I train and assess models in English and French, focusing on data quality, reliability, and user-centric outcomes.

Guillaume Duchateau

AI Prompt Engineer, Data Scientist, AI Developer, +3

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Hi, I'm Guillaume Duchateau, a Multilingual AI Trainer specializing in LLM fine-tuning, evaluation, and multilingual data quality. I help ensure accurate, culturally relevant data for AI systems. With over 13 years in Big Tech, I have managed knowledge graphs and linguistic data workflows that power AI/ML solutions. I train and assess models in English and French, focusing on data quality, reliability, and user-centric outcomes.…Hi, I'm Guillaume Duchateau, a Multilingual AI Trainer specializing in LLM fine-tuning, evaluation, and multilingual data quality. I help ensure accurate, culturally relevant data for AI systems. With over 13 years in Big Tech, I have managed knowledge graphs and linguistic data workflows that power AI/ML solutions. I train and assess models in English and French, focusing on data quality, reliability, and user-centric outcomes.

Available to hire

Hi, I’m Guillaume Duchateau, a Multilingual AI Trainer specializing in LLM fine-tuning, evaluation, and multilingual data quality. I help ensure accurate, culturally relevant data for AI systems.

With over 13 years in Big Tech, I have managed knowledge graphs and linguistic data workflows that power AI/ML solutions. I train and assess models in English and French, focusing on data quality, reliability, and user-centric outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Language

French

Fluent

English

Fluent

Romanian, Moldavian, Moldovan

Intermediate

Work Experience

French Language Specialist – AI Trainer at Invisible Technologies

July 1, 2025 - Present

Designed prompts per technical guidelines across complexity levels; evaluated and ranked responses in various domains; analyzed chatbot conversations and edited outputs; performed audio recording analysis for register and fluency; created semi-scripted audio prompts with targeted tone; conducted peer reviews and QA.

Generalist – AI Agent Assistant at Mindrift

July 1, 2025 - Present

Challenged LLMs (ChatGPT, Perplexity, Gemini, Grok, Claude, Deepseek, etc.) and compared outputs to refine chain-of-thought prompts using external research; produced outputs in English and French.

Prompt Engineer – French at DataAnnotation

July 1, 2025 - Present

Designed complex prompts for French LLMs to ensure intent understanding and coherent responses (single-turn and multi-turn); crafted French prompt variants for model failures; created and QA’d rubrics; recorded audio prompts with background noise for detection; peer-reviewed prompts and rubrics.

AI Tutor – English, French at Outlier AI

May 1, 2025 - Present

Vision SFT: prompt generation based on images with evaluation and ranking of outputs; Audio SFT: evaluation of human-generated audio conversations; model response evaluation and editing (French).

French Linguist – Data QA at Labelbox

August 1, 2024 - Present

Evaluated and ranked LLM outputs in French and English; ensured linguistic accuracy and consistency across labeled datasets; performed Voice Activity Detection evaluation with timestamps for standard speech events (acknowledgment, interruption, and background noise).

Multilingual AI Data Specialist at Fortune 500 Company

January 1, 2012 - May 1, 2025

Specialized in French localization and maintenance of a major knowledge graph; led QA and audits to ensure content accuracy; advised a multicultural team of 1,000+ contributors; supported LLM fine-tuning through RLHF, evaluation tasks, and content ranking; managed user feedback on Knowledge Panels and updated metadata; curated content for real-time global events; ensured factual integrity and contributed to EN/FR tutoring.