Sonic Audit Specialist – Spanish at Mercor

Sonic Audit Specialist (Spanish) | $39.50/hr | Worldwide Remote

Mercor is seeking native and near-native Spanish speakers (Spain variety) to audit AI training data for Amazon's Sonic collections. This is careful, rubric-driven listening and evaluation work — not content production. You will assess transcription accuracy and forced alignment quality across audio recordings, applying structured error codes and writing clear English rationales for every judgment.

What You'll Do

• Multilingual Transcription Audit: Listen to human or agent speech recordings, review annotator-produced transcriptions, and determine whether they accurately reflect what was spoken. Apply a defined set of error codes, assign a pass/fail verdict, and write a concise rationale explaining your decision.
• Forced Alignment Audit: Review word-level audio segments produced by an automated system. Verify that start and end timestamps correctly match each spoken word, and that reference transcriptions match the spoken form. Correct boundary errors by splitting, merging, adding, or removing segments as needed.

Each task runs at 5.00 audit hours. Every judgment requires a written explanation — this is precision work, not volume work.

Who We're Looking For

• Native or near-native Spanish (Spain variety): Born and raised in a Spain-dominant region, or fully fluent with 5+ years of residence there. This is a hard requirement.
• Strong English reading and writing: All rulebooks, error codes, and audit rationales are in English.
• Disciplined rubric application: Ability to apply a written standard consistently across hundreds of judgments. Experience in transcription, subtitling, localization, linguistic annotation, or QA is a strong plus.
• Careful listening skills: Ability to distinguish similar sounds, identify word boundaries in continuous speech, and differentiate acoustic ambiguity from clear annotator error.

Bonus Qualifications

• Prior AI data annotation or model evaluation experience
• Background in phonetics or linguistics
• Familiarity with audio editing or waveform tools

How It Works

You will complete a short calibration phase before production begins. During production, you listen, judge, tag all applicable error codes (not just the first), and submit with a plain-language explanation. Critical errors are flagged first so failure reasons are immediately clear to reviewers.