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Mercor · Voice & audio

Audiobook QA Expert — Portuguese (Brazil) - review AI outputs in your specialty

Listed on Mercor as “Audiobook QA Expert - Portuguese (Brazil)”

$15-$20/hrRemoteContractPaid in USD
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How this rate compares

This listing

$15–$20 per hour

Typical in Voice & audio

$35–$50 per hour

Below the typical range

Typical: the middle of the lowest and highest rates posted by 27 listings in this category on Seoulstart, in US dollars.

What this actually is

You record voice samples following scripts, evaluate AI-generated audio for quality, and provide expert feedback used to train speech models. Often paid by the minute or hour of recording. The platform title (Audiobook QA Expert - Portuguese (Brazil)) reflects the rate band and the expertise required, not the day-to-day work.

How Mercor picks people

  1. Upload your CV and answer the role's written questions.
  2. Do a video interview with Mercor's AI interviewer. Most take about 20 minutes, in English unless the role says otherwise.
  3. Some roles add a skills test. A test you pass once counts for similar roles.
  4. The project team reviews your results and sends offers to the people it picks.

Before you start

  • Take Mercor's free practice interview first. It does not count toward any application.
  • Use Chrome on a computer with a camera and microphone, in a quiet room.
  • You can retake an official interview up to 3 times, but hiring teams see how many times you retook it.

Not every applicant gets an offer. Prepare well for the interview.

How to prepare for the Mercor interview

Source: Mercor's help pages. talent.docs.mercor.com

Can you do this on your visa?

F-2 / F-4 / F-5 / F-6: open. E-1 to E-7: needs concurrent-employment permit. D-2 / D-4 students: S-3 permit, 20 hr/week cap. D-10 / D-8: case by case.

Korean tax on USD income

First 5 years in Korea: foreign-source income only taxed if remitted into Korea. After year 5: worldwide income. Full tax guide.

Original posting from Mercor

Help make the next generation of AI-narrated audiobooks sound genuinely human.

1. Overview

We're building a team of native Portuguese speakers who love audiobooks to help evaluate AI-narrated (text-to-speech) audiobooks in Brazilian Portuguese. You'll listen the way a real audiobook fan does - but with a careful, analytical ear - and flag the moments where the narration slips, so the underlying models can be made better.

This is remote, part-time work at roughly 20 hours per week (about 4 hours per day). You can be based anywhere, though we prefer people living in a region where Brazilian Portuguese is natively spoken.

2. What You'll Do

  • Listen to AI-narrated audiobooks in Brazilian Portuguese and assess how natural, accurate, and enjoyable the narration is.
  • Spot and log errors in the synthesized speech - skipped, added, or mispronounced words; numbers read incorrectly; abbreviations expanded wrongly; unnatural phrasing or intonation; audio glitches and artifacts.
  • Categorize each issue and mark the exact span where it occurs, using our review tooling.
  • Report on overall listener satisfaction and where the narration feels natural versus where it breaks the experience.
  • Work consistently and carefully across many hours of audio without losing attention to detail.

3. Who We're Looking For

  • Native or near-native fluency in Brazilian Portuguese, and an active, genuine audiobook listener - someone who listens regularly and has real opinions about what makes a good listen.
  • Enough working English to report clearly and communicate with the team (you do not need to be bilingual).
  • Some experience with annotation, labeling, transcription, proofreading, linguistics, or other detail-oriented review work.
  • A sharp, patient ear and the discipline to stay accurate over long listening sessions.
  • Reliable availability of about 20 hours per week on a part-time basis.

Nice to Have

  • Prior experience on AI training-data, model-evaluation, or audio/QA annotation projects.
  • A background in language, editing, voice, or audio production.

Quoted from Mercor's public listing on 2026-11-13. We don't edit platform copy; honest framing is in the title and the “what this actually is” block above.

Mercor pays MantaWork a fee if it hires you through this link. Your pay is the same.