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Osvaldo Arredondo

@osvaldoarredondo

Message

I label multilingual data and validate AI training outputs with precision.

Dominican Republic

Message

What I'm looking for

I'm looking for AI data work where I can annotate and validate multilingual text or audio datasets, follow rigorous quality guidelines, and help improve NLP and large language models.

I'm a freelance Data Annotator and AI Trainer working on multilingual text datasets for NLP and large language models. I annotate, tag, and evaluate data while reviewing automated outputs for syntax, entity, and semantic alignment errors.

Across freelance projects on Upwork and Fiverr, I've categorized text strings, evaluated prompt responses, and converted customer-service audio into accurate ground-truth training text. I've also labeled datasets for intent classification and named-entity recognition.

I work carefully within rigorous taxonomies, formatting standards, privacy requirements, and tight 24-to-48-hour timelines. As a native Spanish speaker with B2 English proficiency, I bring strong quality control, pattern recognition, and transcription validation to AI data work.

Experience

Work history, roles, and key accomplishments

Current

Freelance Data Annotator & AI Trainer

Current

Self Employed

Sep 2024 - Present (1 year 11 months)

Annotate, tag, and evaluate large-scale multilingual text datasets to improve NLP and LLMs. Perform quality control by reviewing automated outputs and correcting errors.

Data Annotation NLP LLM Quality Control Audio Transcription Excel

Junior Data Annotator & Transcriptionist

Freelance Platforms

Jul 2023 - Aug 2024 (1 year 1 month)

Categorized text strings, evaluated prompt responses, and converted customer service audios into ground-truth training text. Labeled datasets for intent classification and NER.

Data Annotation Transcription NER Data Privacy Upwork Fiverr