QA Specialist - Audio Annotation & Diarization (Portuguese)

The Workflow:

Contributors record unscripted group conversations. These recordings are run through an initial transcription and diarization pass, which contributors then human-validate and correct. As a QA Specialist, you are the final line of defense, responsible for reviewing the end-to-end quality of both the audio recordings and the human-verified annotations.

Key Responsibilities

Audio Quality Assurance:

• Evaluate multi-channel audio recordings to ensure they meet strict technical and fidelity requirements.
• Verify channel isolation (ensuring no audio bleed) and confirm that recordings were captured in appropriate, quiet environments free from disruptive background noise, clipping, or low gain.

Transcription & Diarization Verification:

• Review human-validated transcriptions to guarantee exceptionally high accuracy and adherence to strict low error-rate (WER) targets.
• Confirm that transcripts correctly capture spontaneous, unnormalized speech, preserving natural conversational dynamics such as overlaps, interruptions, and false starts.
• Validate the precision of turn-level and word-level timestamps, as well as speaker identification, paying special attention to complex, overlapping dialogue , while comfortably reading and validating the underlying JSON-formatted data to ensure accurate metadata tagging and timestamp logic.

Metadata & Content Review:

• Verify the accuracy of all applied metadata, including demographic markers, contextual domains, and specific conversational tags.
• Enforce strict safety and privacy standards by auditing sessions to ensure no Personally Identifying Information (PII), toxic, or sensitive content is present.
• Execution & Reporting:
• Assess the end-to-end quality of the annotation task, assigning clear pass/fail or agree/disagree statuses during your review.
• Provide detailed, actionable comments and feedback whenever disagreeing with an annotator's work.

Requirements & Qualifications

• Exceptional ear for audio fidelity and the ability to detect subtle background noises, channel bleed, or clipping.
• Meticulous attention to detail for verifying word-level timestamps and strict, unnormalized verbatim transcription rules.
• Native proficiency in Portuguese
• Ability to accurately assess complex multi-speaker dynamics.