Mbugua O.

Key Skills

Software

Scale AI

Other

Top Subject Matter

Linguistic/audio & video data for ASR/NLP training

Medical and legal transcription for sensitive documents

Subtitling and captioning for media content

Top Data Types

Audio

Video

Document

Image

Text

Top Task Types

Transcription

Text Summarization

Segmentation

Object Detection

Text Generation

Fine-tuning

Evaluation/Rating

Data Collection

Classification

Freelancer Overview

Data Annotation Specialist | Audio, Video & Linguistic AI Training (Appen | ScaleAI | Upwork). Brings 11+ years of professional experience across legal operations, contract review, compliance, and structured analysis. Core strengths include Scale AI, Other, and Google Workspace. Education includes Bachelor of Arts, Technical University of Kenya and Graduate Diploma, Kenya Polytechnic University College. AI-training focus includes data types such as Audio, Video, and Document and labeling workflows including Transcription and Text Summarization.

Labeling Experience

Data Annotation Specialist | Audio, Video & Linguistic AI Training (Appen | ScaleAI | Upwork)

Scale AIAudioTranscription

Annotated and validated high-precision audio and video data to support AI/ML training, with a focus on ASR, NLP, and speech-related modeling. Applied phonetic transcription, timestamp alignment, speaker labeling, and speech segmentation to produce structured linguistic training inputs. Performed quality assurance reviews to ensure labeling accuracy, consistency, and compliance with project guidelines under strict deadlines. • Labeled emotional tone, prosody, and semantic context datasets to improve language model accuracy • Bridged human language services with AI training data using transcription, subtitling, and translation workflows • Maintained confidentiality and ethical handling standards for sensitive training data • Supported ASR/NLP dataset readiness through validation and structured annotation checks

2025 - Present

Subtitler | Captioner (Rev.com | Deluxe Media Entertainment)

OtherVideoTranscription

Created accurate, culturally relevant captions for audio and visual materials to preserve meaning while maintaining clarity. Produced SDH captions with precise synchronization, speaker identification, and sound effect descriptions for diverse media types. Researched appropriate terminology and followed client or platform-specific guidelines while delivering to strict deadlines. • Ensured accurate timing and synchronization of captions with the audio track • Used Subtitle Edit and similar tools for caption creation • Crafted captions for films, TV shows, and online videos • Applied consistent formatting and style requirements per project instructions

2021 - 2024

Transcriptionist | Meeting Minute Taker (ABC Transcription)

DocumentText Summarization

Provided live note taking and created professional meeting minutes by summarizing key discussions, actions, and decisions. Followed established templates and formatting standards to ensure consistent documentation across meetings. Reviewed recorded meetings carefully to capture essential details and produce comprehensive summaries for timely execution. • Captured decisions and action items in structured meeting minutes • Handled sensitive and confidential information with discretion • Edited and distributed finalized minutes promptly to project leads • Maintained compliance with privacy policies while documenting discussions

2022 - 2023

Independent Contractor | Medical & Legal Transcriptionist (Upwork)

OtherAudioTranscription

Produced accurate verbatim legal and medical transcripts from audio recordings, ensuring adherence to formatting and confidentiality standards. Applied HIPAA-compliant workflows and transcription standards aligned to AAERT practices for sensitive medico-legal and clinical documentation. Completed proofreading and quality assurance checks to meet strict accuracy benchmarks and turnaround requirements. • Transcribed depositions, hearings, court proceedings, interviews, physician dictations, and clinical notes • Produced clean transcripts aligned to client-defined formatting guidelines including medical and legal terminology • Performed thorough grammar and structure reviews during QA cycles • Handled sensitive information with discretion and compliance to privacy requirements

2022 - 2023

Senior Transcriptionist (Skoth LLC, Rev.com, GoTranscript.com)

OtherAudioTranscription

Converted audio and video recordings into accurate, readable text while preserving spoken nuances and improving formatting quality. Achieved high accuracy and formatting scores and completed large-scale transcription work with on-time submission. Conducted comprehensive reviews of final transcripts to ensure adherence to grammar and sentence structure guidelines and maintained confidentiality and security measures. • Transcribed over 2,500 hours of diverse topics with 100% on-time submission • Used Express Scribe, Microsoft Word, and Microsoft Excel to manage transcription and formatting • Followed strict confidentiality and security requirements for sensitive company and client data • Contributed to help forums by guiding other transcriptionists on applying style guides

2016 - 2020

Education

Work History