Jonathan - AI Data Annotator & QA Specialist

Experiencia demostrada en Spanish.

Experiencia demostrada en English.

Evaluated, annotated, and benchmarked complex text datasets to fine-tune LLMs. Performed Quality Assurance (QA) on model outputs to detect hallucinations, edge-case failures, bias, and safety compliance against strict, fast-changing guidelines.. Designed custom Python scripts to automate task logging, track metrics, and optimize personal workflow throughput during batch processing.. Maintained high accuracy standards while adapting seamlessly to weekly project requirement revisions.

Managed high-stress customer inquiries in English, maintaining strict professionalism and resolving account or service disputes efficiently.. Delivered immediate problem resolution with empathy, leading to higher customer loyalty and retention.. Handled escalated calls and technical troubleshooting following standardized operational procedures under tight SLAs.