Speech Audio Specialist - Fully Remote | Up to $50/hr

Mercor; São Paulo; Remote; BRL 120,000 - 180,000; Full time

Job summary

Mercor is seeking an audio engineer to edit and quality-check Brazilian Portuguese voice recordings for TTS and speech AI applications. You will prepare high-quality datasets for ML training and ensure consistency across large volumes of Brazilian Portuguese speech data.

You will apply noise reduction, silence trimming, and artifact removal, perform QA checks, and collaborate with teams on voice talent and model training workflows, enabling scalable, accurate data generation.

Qualifications

• Native or near-native Brazilian Portuguese speaker.
• Experience editing speech or voice recordings (not music).
• Strong understanding of speech audio quality standards.
• Hands-on with iZotope RX, Pro Tools, or similar audio restoration software.

Responsibilities

• Edit Brazilian Portuguese voice recordings for use in TTS and speech AI systems.
• Perform audio cleanup including silence trimming, breath reduction/removal, de-clicking, de-essing, and noise reduction.
• Conduct detailed quality assurance checks for clipping and distortion, background noise, artifacts, and loudness consistency.
• Ensure audio meets strict technical specifications for ML training pipelines.
• Evaluate recordings for pronunciation accuracy, naturalness, and fluency.
• Work with large batches of recordings, maintaining consistency and throughput.
• Collaborate with teams working on Brazilian Portuguese datasets, voice talent recordings, and model training workflows.

Skills

Audio editing

Quality assurance

Brazilian Portuguese fluency

Speech editing

Attention to detail

Tools

iZotope RX

Pro Tools

Job description

OverviewWe're looking for audio engineers with strong experience editing and quality-checking voice recordings for speech and text-to-speech (TTS) applications, specifically for Brazilian Portuguese-language audio. This role focuses on preparing high-quality audio datasets for machine learning systems, ensuring clarity, consistency, and technical compliance across large volumes of Brazilian Portuguese speech data. Native or near-native Brazilian Portuguese fluency is required to accurately assess speech quality, pronunciation, and naturalness.

What You'll Do

• Edit and process Brazilian Portuguese voice recordings for use in TTS and speech AI systems

• Perform audio cleanup including silence trimming, breath reduction/removal, de-clicking, de-essing, and noise reduction

• Conduct detailed quality assurance checks for:

  • Clipping and distortion

  • Background noise and artifacts

  • Loudness consistency and level balancing

• Ensure audio meets strict technical specifications for ML training pipelines

• Evaluate recordings for Brazilian Portuguese pronunciation accuracy, naturalness, and fluency

• Work with large batches of recordings, maintaining consistency and throughput

• Collaborate with teams working on Brazilian Portuguese speech datasets, voice talent recordings, and model training workflows

Basic Qualifications

• Native or near-native Brazilian Portuguese speaker with strong listening intuition for Brazilian Portuguese speech nuances

• Experience editing speech or voice recordings (not just music production)

• Strong understanding of speech audio quality standards and common issues in recorded dialogue

• Hands-on experience with tools like iZotope RX, Pro Tools, or similar audio restoration software

• Ability to identify and fix artifacts, inconsistencies, and technical defects in audio

• Experience working with high-volume audio datasets or structured workflows

Preferred Qualifications

• Experience working with TTS vendors or platforms

• Prior involvement in speech ML, voice AI, or dataset creation/annotation workflows

• Familiarity with audio QA pipelines, labeling, or evaluation processes

• Experience directing or editing Brazilian Portuguese voice talent recordings

Ideal Candidate Profile

• Detail-oriented with strong critical listening skills in Brazilian Portuguese

• Comfortable working with repetitive, high-precision tasks at scale

• Able to balance speed and quality in production environments

• Familiar with the nuances of human Brazilian Portuguese speech vs synthetic voice requirements