Marcela V.

For the past two years I've spent nearly 3,000 hours reviewing and correcting AI-generated Brazilian Portuguese — more than half of my 5,800+ hours on Upwork. I help AI teams make their products sound right in pt-BR: evaluating machine and LLM output, preparing and reviewing language data, and localizing AI-powered products so they read like a native wrote them, not a model. Why a linguist for AI work? Because deciding whether a model's Portuguese is accurate, natural and safe is a language-quality call — and that is what I do every day: • Top Rated Plus on Upwork — 100% Job Success, 230+ jobs, 5,800+ hours • Nearly 3,000 hours as pt-BR reviewer for Linguana (AI video localization): correcting AI translations, subtitles and dubbing scripts, fixing automatic transcriptions, and checking AI-dubbed audio across hundreds of videos (2024–present) • Evaluated machine-translated Brazilian Portuguese subtitles for naturalness and timing — about 30 hours of video, scored and annotated with recurring error patterns • Post-edited 3 machine-translated health books (75,000 words) in 10 days • Translated 100,000 words of lessons for a language-learning app • Selected by an Upwork enterprise client for a Brazilian Portuguese transcription project for AI training (2026) • Nearly 2 years as QC Operator for Netflix — audio, subtitles and closed captions • Subtitle translator and proofreader for Deluxe Media since 2015 (ongoing) • 14 novels translated for Harlequin Brasil What I can do for you: – LLM and MT output evaluation in pt-BR (accuracy, fluency, tone, cultural fit, safety) – Data annotation, labeling and transcription in Brazilian Portuguese – QA and post-editing of machine / AI translation, subtitles and AI dubbing – Localization of chatbots, apps and AI product copy into pt-BR – Native prompt and response writing in Brazilian Portuguese I follow guidelines closely, document edge cases instead of guessing, and deliver on deadline — most of my clients stay for years. English (fluent), Portuguese (native), Spanish (conversational). CAT tools: Trados, memoQ. Send me a sample of your guidelines or data and I'll tell you how I'd approach it.